P2012 Intake Manifold Runner Control Circuit Low (Bank 2)

P2012 Intake Manifold Runner Control Circuit Low (Bank 2) is a generic OBD-II diagnostic trouble code indicating that the Engine Control Module (ECM/PCM) has detected a lower-than-expected electrical signal or voltage in the Bank 2 Intake Manifold Runner Control (IMRC) circuit.

The intake manifold runner control system regulates the path and characteristics of intake air entering the engine. Depending on engine speed, engine load, throttle position, and other operating conditions, the runner mechanism can change position to optimize airflow.

The ECM/PCM controls and monitors the runner-control system through an electrical circuit.

When the monitored Bank 2 runner-control circuit falls below the expected electrical threshold, the ECM/PCM may store P2012 and illuminate the Check Engine Light.

In simple terms, P2012 means the Bank 2 intake manifold runner control circuit is producing or receiving a signal that is lower than the ECM/PCM expects.

Possible causes include:

• Short to ground

• Open or damaged power supply

• Faulty intake manifold runner actuator

• Faulty runner control solenoid

• Faulty position sensor

• Damaged wiring

• Corroded electrical connector

• Loose or damaged terminals

• Poor power supply

• Poor electrical connection

• Incorrect wiring repair

• Internal actuator electrical failure

• ECM/PCM control-circuit fault

• Intake manifold runner mechanical problems

• ECM/PCM software or calibration problems

Importantly, P2012 is a circuit-low code.

Therefore, the first diagnostic priority should be determining why the monitored circuit voltage is lower than expected rather than immediately replacing the intake manifold.

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What Does P2012 Mean?

The code description contains several important terms.

Intake Manifold Runner Control

The Intake Manifold Runner Control (IMRC) system changes the airflow path inside the intake manifold.

The system is designed to optimize intake airflow according to engine operating conditions.

Depending on the engine, the system can help improve:

• Low-RPM torque

• High-RPM airflow

• Throttle response

• Combustion efficiency

• Fuel economy

• Emissions performance

Manufacturers may use different names for similar systems, including:

• Intake Manifold Runner Control (IMRC)

• Intake Runner Control

• Intake Manifold Runner System

• Intake Manifold Flap Control

• Variable Intake Manifold

• Intake Manifold Tuning system

The exact design depends on the engine.

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Circuit Low

The word “Low” is the most important part of P2012.

The ECM/PCM has detected that the monitored electrical circuit is below its expected threshold.

This can occur because of:

• Short to ground

• Low supply voltage

• Open power circuit

• Excessive circuit resistance

• Faulty actuator

• Faulty sensor

• Poor connector connection

• Damaged wiring

The exact cause depends on how the manufacturer designed the runner-control circuit.

Therefore, “Circuit Low” does not automatically mean the runner mechanism is physically closed.

It describes an electrical signal condition.

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Bank 2

Bank 2 refers to the cylinder bank that does not contain cylinder number one.

On a typical V-type engine:

• Bank 1 = side containing cylinder number one

• Bank 2 = opposite side

Therefore:

P2012 = Bank 2

The corresponding Bank 1 low-circuit code is:

P2016 = Intake Manifold Runner Position Sensor / Switch Circuit Low (Bank 1)

Inline engines generally have only one cylinder bank.

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How Does the Intake Manifold Runner Control System Work?

An intake runner control system can contain some combination of:

• Runner flaps

• Electric actuator

• Vacuum actuator

• Control solenoid

• Position sensor

• Position switch

• Mechanical linkage

• ECM/PCM control circuit

A simplified system can be represented as:

ECM/PCM → Runner control circuit → Actuator → Runner mechanism → Position feedback → ECM/PCM

The ECM/PCM commands the runner system according to engine operating conditions.

The actuator moves the runner mechanism.

The position sensor or switch may provide feedback.

The ECM/PCM monitors the relevant electrical circuits.

If the monitored Bank 2 circuit falls below the expected voltage range, P2012 may be stored.

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P2012 Does Not Necessarily Mean the Runner Is Stuck Closed

A common mistake is to interpret P2012 as:

“The intake runner is stuck closed.”

That is not what the code specifically indicates.

P2012 identifies a low electrical circuit condition.

For example, the runner actuator may be mechanically free, but its power wire could be shorted to ground.

In another case, the actuator may be functioning mechanically while the connector has excessive resistance.

The runner itself could therefore be physically capable of moving while the ECM/PCM still detects an abnormally low circuit signal.

This is why the electrical circuit should be tested before replacing mechanical components.

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Symptoms of P2012

Symptoms vary depending on the vehicle and the underlying fault.

Check Engine Light

The most common symptom is an illuminated Check Engine Light.

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Reduced Engine Performance

If the runner system cannot operate correctly, intake airflow may not be optimized.

Possible symptoms include:

• Reduced engine power

• Sluggish acceleration

• Poor engine response

• Reduced performance at certain RPMs

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Poor Low-RPM Torque

Some runner systems increase intake-air velocity at lower engine speeds.

A runner-control fault may reduce low-speed torque.

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Poor High-RPM Performance

If the runner cannot reach its required position at higher engine speeds, airflow can be affected.

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Engine Hesitation

The vehicle may hesitate during acceleration or when engine load changes.

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Poor Throttle Response

Throttle response may feel slower or less consistent.

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Rough Idle

Some vehicles may experience:

• Rough idle

• Uneven engine operation

• Unstable idle speed

However, this symptom is not present on every vehicle with P2012.

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Reduced Fuel Economy

Incorrect intake-air management can affect combustion efficiency and fuel consumption.

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Increased Emissions

Improper intake airflow can affect combustion and emissions performance.

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Limp or Reduced-Power Operation

Some vehicles may use a default runner position or fallback strategy when the ECM/PCM detects a serious runner-control fault.

Depending on the vehicle, this can result in reduced engine performance.

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No Noticeable Symptoms

Some vehicles may continue operating normally apart from the Check Engine Light.

This can occur when the ECM/PCM can maintain acceptable engine operation using a default runner position.

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Common Causes of P2012

Short to Ground

A short to ground is an important possibility with a circuit-low code.

If the runner-control signal or control wire is unintentionally connected to ground, the ECM/PCM may see a voltage lower than expected.

Possible causes include:

• Chafed insulation

• Melted wiring

• Pinched harness

• Incorrect wiring repair

• Damaged connector

• Wire contacting an engine component

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Open or Weak Power Supply

If the actuator or control component does not receive the required power supply, the monitored circuit may fall below the expected voltage.

Possible causes include:

• Blown fuse

• Broken power wire

• Poor relay contact

• Corroded terminal

• Loose connection

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Damaged Wiring

Runner-control wiring is exposed to:

• Engine heat

• Vibration

• Oil

• Moisture

• Movement

Possible faults include:

• Broken conductor

• Chafed insulation

• Melted insulation

• Pinched wire

• High-resistance connection

• Incorrect splice

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Excessive Circuit Resistance

A circuit can have voltage problems even when the wire is not completely broken.

High resistance can be caused by:

• Corrosion

• Loose terminals

• Poor crimp

• Damaged connector

• Partially broken wire

• Poor previous repair

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Corroded Electrical Connector

Corrosion can increase circuit resistance or interrupt the electrical connection.

Check for:

• Oxidized terminals

• Moisture

• Green corrosion

• Loose pins

• Poor terminal tension

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Faulty Runner Actuator

An electric actuator may develop an internal electrical failure.

Possible failures include:

• Internal short

• Failed motor

• Internal wiring failure

• Damaged control electronics

• Excessive current draw

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Faulty Runner Control Solenoid

Some runner systems use a vacuum-control solenoid.

A defective solenoid may cause an abnormal low-circuit condition.

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Faulty Position Sensor

If the position sensor is incorporated into the monitored circuit, an internal sensor failure may produce a low signal.

The sensor should be tested according to the manufacturer's specifications.

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Poor Electrical Ground

Although a ground problem can have different effects depending on the circuit design, a poor connection can cause abnormal voltage behavior.

The relevant power and ground circuits should therefore be tested.

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Incorrect Wiring Repair

A previous repair may have:

• Connected the wrong wires

• Created excessive resistance

• Shorted the signal circuit

• Damaged the harness

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Incorrect Replacement Component

A replacement actuator, sensor, or solenoid with incorrect electrical characteristics may cause the ECM/PCM to detect a circuit fault.

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Intake Manifold Runner Mechanical Problem

A mechanical problem can also affect the overall runner-control system.

Possible problems include:

• Sticking runner

• Carbon buildup

• Damaged linkage

• Broken flap

• Worn shaft

• Excessive mechanical resistance

However, a purely mechanical fault should not be assumed solely because P2012 is stored.

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Vacuum-System Problems

For vacuum-operated systems, possible causes include:

• Cracked vacuum hose

• Disconnected hose

• Vacuum leak

• Faulty control solenoid

• Damaged actuator diaphragm

• Insufficient vacuum supply

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ECM/PCM Driver Fault

The ECM/PCM may contain the driver circuitry used to control the runner actuator or solenoid.

A failed driver can cause abnormal circuit voltage.

This is possible but relatively uncommon.

The module should only be suspected after the external circuit and components have been tested.

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ECM/PCM Software or Calibration Problem

Some vehicles may have known calibration or software problems related to runner-control monitoring.

Manufacturer technical information should be checked before replacing expensive components.

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Vehicles Commonly Affected by P2012

P2012 can occur on many vehicles equipped with a Bank 2 intake manifold runner control system.

Examples may include:

• Ford F-150

• Ford Explorer

• Ford Expedition

• Ford Mustang

• Chevrolet Silverado

• Chevrolet Tahoe

• Chevrolet Suburban

• GMC Sierra

• GMC Yukon

• Cadillac Escalade

• Dodge Charger

• Dodge Challenger

• Jeep Grand Cherokee

• Ram 1500

• Toyota Tundra

• Toyota Sequoia

• Nissan Pathfinder

• Nissan Armada

• Infiniti QX80

• BMW 3 Series

• BMW 5 Series

• Mercedes-Benz E-Class

• Audi Q7

• Volkswagen Touareg

• Porsche Cayenne

This list is not exhaustive.

The exact application depends on:

• Model year

• Engine

• Intake manifold design

• Runner-control architecture

• Actuator type

• Position sensor configuration

• Wiring design

• ECM/PCM calibration

Because P2012 is a generic OBD-II code, the exact diagnostic procedure and electrical specifications vary between manufacturers.

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How Is P2012 Diagnosed?

Because P2012 specifically identifies a low-circuit condition, diagnosis should begin with the electrical system.

The technician should determine whether the low signal is caused by:

• Short to ground

• Low supply voltage

• Open power circuit

• Excessive resistance

• Faulty actuator

• Faulty solenoid

• Faulty sensor

• Connector problem

• Wiring problem

• ECM/PCM driver problem

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Step 1: Scan for Additional Trouble Codes

Use a suitable diagnostic scan tool to retrieve:

• Stored codes

• Pending codes

• History codes

• Freeze-frame data

Look for related codes involving:

• Intake manifold runner control

• Runner position

• Runner actuator

• Sensor circuit

• Reference voltage

• Ground

• Vacuum control

• Engine performance

• Misfires

Additional codes may provide important clues.

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Step 2: Review Freeze-Frame Data

Review the conditions under which P2012 was stored.

Depending on the scan tool, check:

• Engine RPM

• Engine load

• Vehicle speed

• Throttle position

• Engine coolant temperature

• Intake air temperature

• Battery voltage

• Runner commanded position

• Runner actual position

This can help determine whether the fault occurs continuously or under particular operating conditions.

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Step 3: Inspect the Wiring

Visually inspect the Bank 2 runner-control wiring.

Look for:

• Chafed wires

• Melted insulation

• Broken conductors

• Pinched harnesses

• Oil contamination

• Moisture

• Wiring touching hot components

• Incorrect previous repairs

Pay particular attention to areas where the harness could contact ground.

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Step 4: Inspect the Connector

Inspect the relevant connector for:

• Corrosion

• Moisture

• Bent pins

• Loose terminals

• Poor terminal tension

• Damaged seals

• Broken locking mechanism

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Step 5: Check Circuit Voltage

Using the vehicle-specific wiring diagram, identify the monitored circuit and measure its voltage.

Compare the measured voltage with the manufacturer's specification.

If the voltage is lower than expected, determine whether the cause is:

• Short to ground

• Low power supply

• Excessive resistance

• Faulty component

• Wiring problem

Do not assume a universal voltage threshold because circuit designs differ.

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Step 6: Check for a Short to Ground

Check the relevant control or signal circuit for an unintended connection to ground.

Possible causes include:

• Chafed wiring

• Melted insulation

• Pinched harness

• Incorrect splice

• Damaged connector

Follow the manufacturer's test procedure and ignition-state requirements.

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Step 7: Check Power Supply

Verify the component receives the required power supply.

Depending on the system, check:

• Battery voltage

• Ignition voltage

• Fuse

• Relay

• Power wire

• Connector terminal

A missing or weak power supply can create a low-circuit condition.

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Step 8: Check Ground Circuits

Verify the relevant ground circuit.

Check for:

• Excessive resistance

• Corrosion

• Loose connections

• Damaged ground wire

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Step 9: Check for Excessive Circuit Resistance

Perform the appropriate resistance and voltage-drop tests.

High resistance can result from:

• Corroded terminals

• Poor crimps

• Loose connectors

• Partially broken wires

• Incorrect splices

A wire that has continuity may still have excessive resistance under load.

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Step 10: Test the Position Sensor

If the runner system uses a position sensor, monitor its output while the runner mechanism operates.

Look for:

• Abnormally low output

• No signal

• Incorrect signal

• Signal dropouts

• Sudden changes

• Implausible position readings

Use vehicle-specific specifications.

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Step 11: Test the Runner Actuator

If an electric actuator is used, test:

• Power supply

• Ground

• Control circuit

• Motor operation

• Internal position feedback

• Current draw where specified

If supported by the diagnostic equipment, command the actuator through its operating range.

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Step 12: Test the Runner Control Solenoid

For vacuum-operated systems, inspect and test the control solenoid.

Verify:

• Power

• Ground

• Control signal

• Coil resistance where specified

• Solenoid activation

• Vacuum switching

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Step 13: Inspect the Runner Mechanism

If the electrical circuit checks correctly, inspect the mechanical runner system.

Check for:

• Carbon buildup

• Sticking flaps

• Broken linkage

• Worn shafts

• Excessive play

• Mechanical obstruction

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Step 14: Check Vacuum Operation

If applicable, inspect:

• Vacuum supply

• Vacuum hoses

• Control solenoid

• Actuator diaphragm

• Vacuum reservoir

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Step 15: Monitor Commanded and Actual Runner Position

If live data is available, compare:

Commanded runner position vs. actual runner position

A mismatch can indicate:

• Actuator failure

• Position-sensor problem

• Mechanical binding

• Linkage damage

With P2012, however, the low electrical circuit condition should still be investigated first.

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Step 16: Perform a Wiggle Test

Monitor the circuit while carefully moving the relevant wiring harness and connector.

If the circuit voltage changes unexpectedly, inspect the harness and connector for an intermittent electrical connection.

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Step 17: Compare Bank 1 and Bank 2

If the engine uses equivalent runner-control systems on both banks, compare:

• Circuit voltage

• Sensor signal

• Actuator operation

• Runner movement

• Commanded position

• Actual position

Bank 1 can provide a useful reference when both systems are designed similarly.

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Step 18: Check Manufacturer Technical Information

Look for:

• Technical Service Bulletins

• Known runner-control problems

• Wiring harness issues

• Connector problems

• Updated actuators

• Updated sensors

• Updated solenoids

• Software updates

• Calibration procedures

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Step 19: Perform Calibration or Relearn

Some vehicles require runner position calibration or relearn after replacing:

• Runner actuator

• Position sensor

• Intake manifold

• Runner mechanism

Follow the manufacturer's procedure.

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Step 20: Test the ECM/PCM

If the wiring, connector, power supply, ground, actuator, solenoid, sensor, and mechanical runner system all test correctly, further ECM/PCM testing may be required.

ECM/PCM replacement should not be the first response to P2012.

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How to Fix P2012

The correct repair depends on the confirmed cause.

Repair a Short to Ground

If the monitored circuit is shorted to ground:

• Repair damaged insulation.

• Replace damaged wiring.

• Correct incorrect splices.

• Repair damaged connectors.

• Secure the harness correctly.

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Repair Damaged Wiring

Repair or replace wiring affected by:

• Heat

• Chafing

• Vibration

• Oil

• Moisture

• Previous repairs

Follow the manufacturer's recommended wiring-repair procedure.

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Repair or Replace the Connector

If the connector has:

• Corroded terminals

• Loose pins

• Bent terminals

• Poor terminal tension

• Damaged seals

repair or replace it as necessary.

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Repair the Power Supply

If the component is not receiving the required power:

• Check the fuse.

• Check the relay.

• Repair the power wire.

• Repair damaged terminals.

• Correct poor electrical connections.

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Replace the Faulty Runner Actuator

If testing confirms an internal actuator electrical failure, replace the correct vehicle-specific actuator.

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Replace the Faulty Control Solenoid

For vacuum-operated systems, replace a defective runner-control solenoid when testing confirms the fault.

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Replace the Faulty Position Sensor

If the position sensor is confirmed to produce an abnormally low signal, replace it.

Do not replace the sensor solely because P2012 is stored.

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Repair the Runner Mechanism

If mechanical binding, carbon buildup, damaged linkage, or a broken runner mechanism is found, repair the underlying problem.

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Repair Vacuum-System Problems

Repair:

• Cracked vacuum hoses

• Disconnected hoses

• Vacuum leaks

• Faulty control solenoids

• Damaged vacuum actuators

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Replace the Intake Manifold

If the internal runner mechanism is damaged and cannot be repaired separately, the intake manifold may require replacement.

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Perform Calibration or Relearn

If required, perform the manufacturer's runner position calibration or relearn procedure after replacing the relevant component.

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Update ECM/PCM Software

If a manufacturer software update addresses the runner-control monitoring problem, update the ECM/PCM according to the applicable procedure.

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Repair or Replace the ECM/PCM

If all external components and circuits are confirmed to be correct but the ECM/PCM continues to detect or control the circuit incorrectly, further module testing may be necessary.

ECM/PCM replacement should be considered only after the external circuit has been thoroughly verified.

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Clear the Code and Verify the Repair

After completing the repair:

1. Clear P2012.

2. Monitor Bank 2 runner-control data.

3. Check circuit voltage.

4. Verify power supply.

5. Verify ground.

6. Check the signal/control circuit.

7. Inspect the connector.

8. Test wiring continuity and resistance.

9. Check for a short to ground.

10. Perform a voltage-drop test where appropriate.

11. Perform a wiggle test.

12. Test the runner actuator or control solenoid.

13. Check position-sensor operation where applicable.

14. Inspect the runner linkage.

15. Check for mechanical binding.

16. Check the vacuum system where applicable.

17. Perform the required calibration or relearn.

18. Complete the appropriate drive cycle.

19. Confirm that P2012 does not return.

The vehicle should ideally be tested under the operating conditions that originally triggered the code.

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What Happens If P2012 Is Ignored?

P2012 does not normally indicate immediate catastrophic engine failure.

However, the ECM/PCM may be unable to properly control or monitor the Bank 2 intake manifold runner system.

Possible consequences include:

• Reduced engine performance

• Poor throttle response

• Reduced low-RPM torque

• Poor high-RPM performance

• Reduced fuel economy

• Increased emissions

• Engine hesitation

• Rough engine operation

• Continued Check Engine Light

• Additional runner-control faults

If the underlying cause is a short to ground or another serious electrical fault, continued operation may also place abnormal electrical stress on the affected circuit or component.

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Can You Drive With P2012?

In many cases, a vehicle with P2012 can still be driven if the engine operates normally.

P2012 is generally not an immediate engine-damage code.

However, the electrical fault should be diagnosed and repaired.

Driving should be treated more cautiously if the vehicle also has:

• Significant power loss

• Severe hesitation

• Stalling

• Engine misfires

• Rough running

• Multiple engine-control codes

• Poor throttle response

If the Check Engine Light is flashing or the engine is actively misfiring, the vehicle should be inspected promptly.

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Is P2012 a Serious Code?

P2012 is generally considered a low-to-moderate severity diagnostic trouble code.

The actual severity depends on the underlying cause.

A connector or wiring problem may cause relatively minor symptoms.

A failed actuator, shorted circuit, or damaged runner mechanism can produce more noticeable performance problems.

Ignoring P2012 can contribute to:

• Reduced engine performance

• Reduced fuel economy

• Increased emissions

• Poor intake-air management

• Continued Check Engine Light

• Additional runner-control problems

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P2012 vs. P2013

P2012 and P2013 concern the same general Bank 2 Intake Manifold Runner Control circuit, but they identify opposite electrical conditions.

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2013	Intake Manifold Runner Control Circuit High (Bank 2)

The distinction is:

P2012 = low circuit signal

P2013 = high circuit signal

P2012 means the monitored circuit is below the expected electrical threshold.

P2013 means the monitored circuit is above the expected electrical threshold.

This difference is important during diagnosis.

For P2012, the technician should pay particular attention to:

• Short to ground

• Low supply voltage

• Excessive resistance

• Poor connections

• Faulty actuator or sensor

For P2013, particular attention should be paid to:

• Short to battery voltage

• Incorrect wiring

• Faulty component producing excessive voltage

• Connector problems

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P2012 vs. P2014

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2014	Intake Manifold Runner Position Sensor / Switch Circuit (Bank 1)

The main differences are:

P2012 = Bank 2 + circuit low

P2014 = Bank 1 + general circuit malfunction

P2012 provides more specific information about the electrical condition because it identifies a low circuit signal.

P2014 is a broader Bank 1 circuit fault and does not specifically identify whether the signal is low, high, or intermittent.

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P2012 vs. P2015

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2015	Intake Manifold Runner Position Sensor / Switch Circuit Range / Performance (Bank 1)

The difference is:

P2012 = Bank 2 + low electrical circuit

P2015 = Bank 1 + range/performance

P2012 directs the diagnostic process toward the circuit voltage and electrical system.

P2015 indicates that the sensor feedback or runner operation is outside the expected range or performance parameters and may therefore involve a mechanical runner problem.

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P2012 vs. P2016

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2016	Intake Manifold Runner Position Sensor / Switch Circuit Low (Bank 1)

These are corresponding low-circuit faults affecting different banks.

P2012 = Bank 2

P2016 = Bank 1

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P2012 vs. P2017

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2017	Intake Manifold Runner Position Sensor / Switch Circuit High (Bank 1)

The electrical conditions are opposite:

P2012 = low

P2017 = high

They also concern different cylinder banks.

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P2012 vs. P2018

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2018	Intake Manifold Runner Position Sensor / Switch Circuit Intermittent (Bank 1)

The distinction is:

P2012 = Bank 2 low-circuit condition

P2018 = Bank 1 intermittent circuit condition

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P2012 vs. P2019

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2019	Intake Manifold Runner Position Sensor / Switch Circuit Malfunction (Bank 2)

Both concern Bank 2.

The difference is:

P2012 = specific low-circuit condition

P2019 = general circuit malfunction

P2012 therefore gives more information about the electrical state detected by the ECM/PCM.

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P2012 vs. P2020

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2020	Intake Manifold Runner Position Sensor / Switch Circuit Range / Performance (Bank 2)

Both concern Bank 2, but:

P2012 = low electrical circuit

P2020 = range/performance

A P2020 fault can involve a mismatch between commanded and actual runner position even when the electrical circuit is functioning.

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P2012 vs. P2021

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2021	Intake Manifold Runner Position Sensor / Switch Circuit Low (Bank 2)

Both identify Bank 2 low-signal conditions.

However, their descriptions refer to different aspects of the intake runner system:

P2012 = Intake Manifold Runner Control circuit low

P2021 = Intake Manifold Runner Position Sensor / Switch circuit low

The exact physical component should be confirmed using the vehicle-specific wiring diagram and service information.

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P2012 vs. P2022

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2022	Intake Manifold Runner Position Sensor / Switch Circuit High (Bank 2)

Both concern Bank 2 but identify opposite electrical conditions:

P2012 = low

P2022 = high

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P2012 vs. P2023

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2023	Intake Manifold Runner Position Sensor / Switch Circuit Intermittent (Bank 2)

The distinction is:

P2012 = low circuit

P2023 = intermittent circuit

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P2012 vs. P2075

P2075 concerns the Intake Manifold Tuning (IMT) Valve Position Sensor / Switch Circuit Malfunction (Bank 1).

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2075	Intake Manifold Tuning (IMT) Valve Position Sensor / Switch Circuit Malfunction (Bank 1)

These codes concern related intake-air control systems, but they should not automatically be considered the same physical component.

Manufacturers can use different terminology and different intake-manifold control architectures.

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P2012 vs. P2076

P2076 concerns the Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Range/Performance (Bank 1).

Code	General Meaning
P2012	Intake Manifold Runner Control Circuit Low (Bank 2)
P2076	Intake Manifold Tuning (IMT) Valve Position Sensor / Switch Circuit Range / Performance (Bank 1)

P2012 specifically identifies a Bank 2 low-circuit condition.

P2076 identifies a Bank 1 range/performance problem involving an IMT valve position sensor/switch.

The exact physical components should be confirmed for the specific vehicle.

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How to Prevent P2012

Not every runner-control electrical fault can be prevented, but proper maintenance can reduce the likelihood of problems.

Recommended practices include:

• Inspect runner-control wiring during routine service.

• Keep wiring away from excessive engine heat.

• Secure wiring harnesses against vibration.

• Check electrical connectors for corrosion.

• Prevent moisture from entering connectors.

• Repair damaged wiring promptly.

• Avoid poorly executed wiring repairs.

• Inspect vacuum hoses on vacuum-operated systems.

• Address excessive intake carbon buildup when appropriate.

• Repair loose or damaged runner linkage.

• Use the correct replacement actuator, sensor, or solenoid.

• Make sure connectors are fully seated after service.

• Follow manufacturer calibration procedures.

• Do not ignore Check Engine Light warnings.

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Final Thoughts

P2012 Intake Manifold Runner Control Circuit Low (Bank 2) indicates that the ECM/PCM has detected an electrical signal or voltage below the expected threshold in the Bank 2 intake manifold runner control circuit.

The most important point is that P2012 is a circuit-low code.

It should therefore be diagnosed differently from:

• A general runner-control circuit malfunction

• A circuit-high fault

• A range/performance fault

• An intermittent circuit fault

Possible causes include:

• Short to ground

• Low power supply

• Open power circuit

• Excessive circuit resistance

• Damaged wiring

• Corroded connector

• Loose terminals

• Faulty actuator

• Faulty control solenoid

• Faulty position sensor

• Mechanical runner problems

• Vacuum-system problems

• ECM/PCM driver fault

• ECM/PCM software issues

The first priority should be determining why the monitored Bank 2 circuit voltage is lower than expected.

Start by scanning for additional trouble codes and reviewing freeze-frame data.

Then inspect the Bank 2 runner-control wiring and connector carefully.

Check the relevant power supply, ground, control, and signal circuits according to the vehicle-specific wiring diagram.

Test for a short to ground and check for excessive circuit resistance or voltage drop.

If the electrical circuit is correct, test the runner actuator, control solenoid, and position sensor where applicable.

Only then should the mechanical runner mechanism be investigated for carbon buildup, sticking, damaged linkage, or other mechanical problems.

The actuator, sensor, solenoid, or intake manifold should not automatically be replaced simply because P2012 is stored.

P2012 is generally a low-to-moderate severity code, and many vehicles can still be driven if they operate normally. However, the underlying fault should be repaired because incorrect runner control can affect engine performance, fuel economy, emissions, and throttle response.

After the confirmed fault has been repaired, clear P2012 and verify the system under the operating conditions that originally triggered the code.

The Bank 2 runner-control circuit should return to the specified electrical range, the runner system should operate correctly, and P2012 should not return.