P2107 Throttle Actuator Control Module Processor

The P2107 Throttle Actuator Control Module Processor diagnostic trouble code indicates that the Engine Control Module (ECM/PCM) has detected a problem with the processor or internal control operation of the Throttle Actuator Control (TAC) system.

In simple terms, the vehicle's computer has detected that the electronic throttle-control processor is not operating correctly.

Modern vehicles use Electronic Throttle Control (ETC) rather than a traditional mechanical accelerator cable. The system electronically controls the throttle plate and continuously monitors accelerator-pedal position, throttle position, actuator operation, and related electrical signals.

When the ECM/PCM detects an internal processor-related fault within the TAC system, it may store P2107.

Depending on the vehicle, the fault can cause:

• Check Engine Light

• Reduced engine power

• Limp mode

• Limited engine RPM

• Poor accelerator response

• Throttle hesitation

• Unstable idle

• Cruise-control deactivation

• Electronic throttle warning

• Reduced Power message

P2107 is more specific than a general throttle-performance code because it points toward processor/control operation, but it still does not automatically prove that a particular module must be replaced. Power supply, grounds, wiring, communication, software, throttle-body electronics, and module configuration should be checked before condemning a control module.

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What Does P2107 Mean?

P2107 means the ECM/PCM has detected a processor-related problem involving the Throttle Actuator Control system.

The code description can be understood as:

Throttle Actuator Control

The TAC system controls the electronic throttle and normally includes several interconnected components.

These may include:

• Accelerator-pedal position sensors

• Electronic throttle body

• Throttle actuator motor

• Throttle-position sensors

• TAC control circuitry

• ECM/PCM

• Wiring and connectors

• Power and ground circuits

• Software and calibration

Module Processor

The processor is the electronic control logic responsible for processing sensor information and controlling the throttle actuator.

A processor-related fault can involve:

• Internal module operation

• Processor self-test failure

• Internal memory or logic errors

• Software problems

• Communication problems

• Incorrect module programming

• Power-supply instability

The exact meaning depends on the vehicle manufacturer's implementation.

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How Does the Throttle Actuator Control System Work?

A typical electronic throttle system works through several stages.

1. The driver presses the accelerator pedal.

2. Accelerator-pedal position sensors detect pedal movement.

3. Redundant pedal signals are sent to the ECM/PCM.

4. The control system interprets the driver's requested torque.

5. The ECM determines the required throttle opening.

6. The throttle actuator motor moves the throttle plate.

7. Throttle-position sensors report the actual position.

8. The control module compares commanded and actual positions.

9. The system continuously checks sensor correlation and actuator operation.

10. Internal diagnostics monitor the processor and control circuits.

11. If the processor or control logic fails its diagnostic checks, P2107 may be stored.

The redundancy is important because electronic throttle control directly affects engine torque and acceleration.

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Why Is a TAC Processor Fault Important?

The throttle actuator is not simply an ordinary engine sensor.

It is part of the system that determines how much air enters the engine and therefore influences engine torque.

The TAC system can also interact with:

• Cruise control

• Traction control

• Electronic stability control

• Automatic transmission torque management

• Idle control

• Emissions control

• Engine protection strategies

Because of this, a processor-related fault can cause the vehicle to enter a fail-safe strategy.

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Symptoms of P2107

The symptoms depend on the vehicle and the severity of the processor fault.

Check Engine Light

The Check Engine Light may illuminate when P2107 is stored.

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Reduced Engine Power

The ECM may limit engine torque to prevent uncontrolled throttle operation.

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Limp Mode

The vehicle may enter a fail-safe operating mode.

Possible limitations include:

• Maximum engine RPM

• Throttle opening

• Engine torque

• Accelerator response

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Poor Accelerator Response

The accelerator pedal may respond slowly or inconsistently.

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Limited Acceleration

The vehicle may have difficulty accelerating normally.

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Throttle Hesitation

There may be a noticeable delay between accelerator-pedal movement and engine response.

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Rough or Unstable Idle

The throttle system may have difficulty maintaining the correct airflow at idle.

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High or Low Idle

An electronic throttle-control problem can affect the amount of air entering the engine at idle.

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Engine Stalling

A severe TAC processor or control problem can contribute to engine stalling.

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Engine Surging

Incorrect throttle control can sometimes cause unwanted engine-speed changes.

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Cruise Control Deactivation

Cruise control may be disabled because reliable throttle control cannot be guaranteed.

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Electronic Throttle Warning

Some vehicles may display an electronic throttle-control warning.

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Reduced Power Warning

Certain vehicles may display:

Reduced Engine Power

or a similar warning message.

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Common Causes of P2107

Internal TAC Module or Processor Fault

An internal control-module failure is one of the main possibilities suggested by P2107.

Possible internal problems include:

• Processor failure

• Internal memory error

• Internal circuit failure

• Processor self-test failure

• Internal communication error

• Overheating-related electronic failure

However, the module should not be condemned without testing its power, ground, communication, and related circuits.

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Software or Calibration Problem

A software problem can cause a processor self-test or control function to fail.

Possible causes include:

• Corrupted calibration

• Incorrect programming

• Software bugs

• Interrupted programming

• Incorrect module configuration

A manufacturer software update may sometimes correct the problem.

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Low Battery Voltage

A weak battery or unstable electrical supply can cause electronic control modules to behave incorrectly.

P2107 may be particularly relevant if it appeared:

• During engine starting

• After a weak-battery event

• After the battery was disconnected

• Alongside multiple low-voltage codes

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Charging-System Problems

A failing alternator or voltage regulator can create unstable system voltage.

Electronic throttle control is sensitive to electrical supply problems.

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Poor Module Ground

A poor ground connection can cause processor operation to become unstable.

Possible causes include:

• Corrosion

• Loose ground connection

• Damaged ground cable

• High resistance

• Poor engine-to-chassis ground

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Power Supply Problem

A module may experience processor errors if its power supply is interrupted or falls outside the expected range.

Possible causes include:

• Blown fuse

• Loose fuse connection

• Damaged power wire

• Relay problem

• Corroded connection

• Voltage drop

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Wiring Problems

The TAC system can contain multiple circuits between the ECM, throttle body, accelerator pedal, and related modules.

Possible wiring problems include:

• Broken wires

• Chafing

• Heat damage

• Melted insulation

• Pinched wires

• Short circuits

• Open circuits

• Poor previous repairs

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Connector Problems

Corroded or loose connectors can interrupt power, ground, sensor, or communication circuits.

Inspect for:

• Corrosion

• Water intrusion

• Loose terminals

• Bent pins

• Backed-out terminals

• Damaged connector housings

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CAN Communication Problems

Some vehicles use communication networks between the ECM/PCM and other control modules.

A communication problem can cause a module to report processor or control errors.

Possible causes include:

• CAN-H wiring damage

• CAN-L wiring damage

• Short to ground

• Short to voltage

• Poor connector contact

• Module power failure

• Network termination problems

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Throttle Body Electronics Problem

On some vehicles, the throttle body contains electronic circuitry associated with throttle control.

A fault in the throttle body's electronics can contribute to a TAC processor-related code.

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Throttle Actuator Motor Problem

A mechanically or electrically defective throttle actuator motor may place abnormal demands on the control system.

Possible problems include:

• Excessive current draw

• Internal short

• Open circuit

• Motor wear

• Mechanical binding

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Dirty or Binding Throttle Plate

Carbon buildup can make the throttle plate difficult to move.

The actuator may have to work harder to move the plate, potentially contributing to abnormal system operation.

However, a dirty throttle body alone should not automatically be blamed for P2107.

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Accelerator Pedal Position Sensor Problem

The accelerator pedal generally contains redundant sensors.

Incorrect or implausible pedal signals can cause the throttle-control system to enter a protective strategy.

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Faulty Throttle Position Sensor

The throttle body typically uses redundant position feedback.

A sensor problem may cause:

• Incorrect throttle-position feedback

• Signal dropout

• Erratic readings

• Sensor correlation errors

• Incorrect minimum position

• Incorrect maximum position

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Faulty ECM/PCM

Because some vehicles integrate TAC processing directly into the ECM/PCM, an internal ECM/PCM fault can potentially cause P2107.

But the ECM/PCM should generally be considered only after:

• Power supply

• Grounds

• Wiring

• Communication

• Sensors

• Throttle actuator

• Software

• Calibration

have been properly checked.

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Vehicles Commonly Affected by P2107

P2107 can occur on many OBD-II vehicles equipped with electronic throttle-control systems.

Examples may include:

• Ford F-150

• Ford Mustang

• Ford Explorer

• Ford Focus

• Ford Escape

• Ford Fusion

• Ford Ranger

• Chevrolet Silverado

• Chevrolet Tahoe

• Chevrolet Suburban

• Chevrolet Camaro

• Chevrolet Malibu

• GMC Sierra

• GMC Yukon

• Cadillac Escalade

• Dodge Charger

• Dodge Challenger

• Ram 1500

• Jeep Grand Cherokee

• Jeep Wrangler

• Chrysler Pacifica

• Toyota Camry

• Toyota Corolla

• Toyota Tundra

• Toyota Tacoma

• Honda Accord

• Honda Civic

• Honda CR-V

• Nissan Altima

• Nissan Pathfinder

• Nissan Titan

• BMW 3 Series

• BMW 5 Series

• Mercedes-Benz C-Class

• Mercedes-Benz E-Class

• Volkswagen Golf

• Volkswagen Passat

• Audi A4

• Audi A6

This list is not exhaustive.

The exact TAC architecture and diagnostic procedure vary by manufacturer, model, engine, and model year.

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How Is P2107 Diagnosed?

P2107 should be diagnosed systematically.

Because the code refers to processor operation, it can be tempting to immediately replace the ECM or throttle-control module. That can lead to unnecessary repairs.

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Check for Additional Trouble Codes

Perform a complete diagnostic scan.

Pay particular attention to codes involving:

• Throttle actuator control

• Throttle position sensors

• Accelerator-pedal position sensors

• Throttle motor

• Minimum-stop performance

• Maximum-stop performance

• Sensor correlation

• 5-volt reference

• Battery voltage

• Communication

Related codes may include:

• P2100

• P2101

• P2102

• P2103

• P2104

• P2105

• P2106

• P2108

• P2109

• P2110

• P2111

• P2112

• P2113

• P2114

• P2115

• P2116

• P2117

• P2118

• P2119

• P2120

• P2121

• P2122

• P2123

• P2124

• P2125

• P2126

• P2127

• P2128

• P2129

• P2130

• P2131

• P2132

• P2133

• P2134

• P2135

• P2136

• P2137

• P2138

• P2139

• P2140

If several of these codes are present simultaneously, they may provide much more useful information than P2107 alone.

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Check Freeze-Frame Data

Review the conditions under which P2107 was recorded.

Useful information includes:

• Engine RPM

• Vehicle speed

• Accelerator-pedal position

• Throttle position

• Commanded throttle position

• Battery voltage

• Engine coolant temperature

• Engine load

• Other active fault codes

Determine whether the processor fault occurred:

• During startup

• At idle

• During acceleration

• During deceleration

• During high electrical load

• During low battery voltage

• After battery disconnection

• After throttle-body service

This can help identify whether the fault is related to a transient electrical event or a persistent module problem.

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Check Battery and Charging Voltage

Before diagnosing a processor as defective, verify the vehicle's electrical supply.

Check:

• Battery condition

• Battery terminals

• Charging voltage

• Alternator operation

• Engine grounds

• Chassis grounds

A processor can behave abnormally when supply voltage is unstable.

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Check Module Power Supply

Verify the power supply to the relevant TAC/ECM module.

Inspect:

• Fuses

• Relays

• Power wires

• Voltage drop

• Ignition-feed circuits

A momentary power interruption can sometimes produce an internal module fault code.

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Check Module Grounds

Perform a proper ground and voltage-drop test.

Do not rely only on a visual inspection.

A ground connection can look clean while still having excessive electrical resistance under load.

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Check Communication Circuits

If applicable, check communication between the TAC module and ECM/PCM.

Inspect:

• CAN-H

• CAN-L

• Connectors

• Termination

• Shorts

• Open circuits

Other communication codes can be an important clue.

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Check Throttle and Pedal Sensor Data

Monitor:

• Accelerator-pedal position sensors

• Throttle-position sensors

• Commanded throttle position

• Actual throttle position

The signals should be stable and plausible.

Look for:

• Dropouts

• Sudden jumps

• Incorrect minimum values

• Incorrect maximum values

• Correlation problems

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Inspect the Throttle Body

Inspect the throttle body for:

• Carbon deposits

• Dirt

• Foreign material

• Mechanical damage

• Throttle plate binding

• Internal gear damage

• Signs of overheating

If cleaning is appropriate, follow the manufacturer's procedure.

Do not force an electronic throttle plate manually if the manufacturer warns against doing so.

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Test the Throttle Actuator Motor

Where manufacturer procedures permit, test the actuator motor.

Check for:

• Open circuit

• Short circuit

• Excessive current

• Mechanical resistance

• Inconsistent movement

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Check the 5-Volt Reference

Where applicable, verify the sensor reference voltage.

If multiple sensors share the same reference circuit, determine whether another sensor or wiring fault is pulling the reference voltage outside specification.

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Check Sensor Grounds

Verify sensor-ground integrity.

Look for:

• High resistance

• Voltage drop

• Corrosion

• Loose connections

• Damaged ground wiring

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Perform a Wiggle Test

While monitoring live data, carefully move the relevant harnesses and connectors.

An unexpected change in throttle or pedal sensor data may indicate an intermittent wiring or connector fault.

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Check for Software Updates

Check manufacturer service information for:

• ECM/PCM software updates

• TAC module updates

• Calibration revisions

• Known processor faults

• Programming procedures

Some processor-related codes may be resolved through software updates rather than component replacement.

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Perform Required Module Programming

If a TAC module or ECM/PCM has been replaced, it may require:

• Programming

• Configuration

• Security initialization

• Throttle adaptation

• Sensor calibration

A replacement module that has not been correctly programmed may not operate correctly.

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Perform Throttle Adaptation

Where required, perform the manufacturer-specific throttle adaptation procedure.

This may be necessary after:

• Throttle-body replacement

• Throttle-body cleaning

• Accelerator-pedal replacement

• Battery disconnection

• ECM replacement

• Module replacement

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How to Fix P2107

The correct repair depends on the confirmed cause.

Repair Power-Supply Problems

Correct:

• Low battery voltage

• Voltage drops

• Blown fuses

• Faulty relays

• Damaged power wiring

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Repair Ground Problems

Repair corroded, loose, damaged, or high-resistance grounds.

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Repair Wiring

Repair or replace damaged TAC wiring caused by:

• Chafing

• Heat

• Vibration

• Corrosion

• Pinching

• Previous repairs

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Repair Connectors

Replace damaged terminals or connector housings and restore proper terminal tension.

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Repair CAN Communication Problems

If communication faults are confirmed, repair the affected CAN wiring, connectors, or network components.

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Clean the Throttle Body

If excessive deposits are preventing correct throttle movement, clean the throttle body using the manufacturer's recommended procedure.

Perform the required adaptation afterward.

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Replace the Throttle Body

If testing confirms an internal throttle-body electronic, actuator, sensor, or mechanical failure, replace the throttle-body assembly.

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Replace the Accelerator Pedal Assembly

If accelerator-pedal sensor testing confirms an internal fault, replace the pedal assembly where the sensors are integrated.

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Update or Reprogram the Module

If manufacturer information identifies a software or calibration problem, update or reprogram the relevant control module.

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Replace the TAC Module

If the vehicle uses a dedicated TAC module and testing confirms an internal processor failure, replace and program the module according to manufacturer procedures.

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Replace the ECM/PCM

If TAC processing is integrated into the ECM/PCM and all other possible causes have been eliminated, the ECM/PCM may require replacement.

The replacement unit will normally require programming and configuration.

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What Happens If P2107 Is Ignored?

P2107 should not be ignored because the TAC system directly controls engine torque.

Possible consequences include:

• Reduced engine power

• Limp mode

• Limited acceleration

• Poor throttle response

• Rough idle

• Engine stalling

• Cruise-control deactivation

• Additional throttle-control codes

• Increased emissions

A severe processor fault may cause the ECM to enter a fail-safe strategy with very limited throttle operation.

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Can You Drive With P2107?

Whether the vehicle can be driven depends on its symptoms.

If the engine is operating normally and accelerator response remains predictable, a short trip to a repair facility may be possible.

However, P2107 should be diagnosed promptly because the electronic throttle system is involved in engine torque control.

Avoid driving if the vehicle has:

• Sudden loss of acceleration

• Unpredictable throttle response

• Severe hesitation

• Repeated stalling

• Reduced-power mode

• Very limited engine RPM

• Electronic throttle warnings

If the accelerator becomes unpredictable or the vehicle cannot maintain safe speed, stop driving and have the vehicle inspected.

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Is P2107 a Serious Code?

P2107 is generally considered a high-severity diagnostic trouble code when accompanied by drivability symptoms.

The code concerns the control logic of an electronic throttle system, which is directly involved in engine torque and acceleration.

The severity is particularly high when the vehicle experiences:

• Reduced engine power

• Limp mode

• Stalling

• Unpredictable accelerator response

• Severe throttle hesitation

• Inability to accelerate normally

If the vehicle continues to drive normally with only a stored code, the immediate risk may be lower, but the fault should still be investigated.

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P2107 vs. Related Throttle Actuator Codes

Code	General Description
P2107	Throttle Actuator Control Module Processor
P2108	Throttle Actuator Control Module Performance
P2109	Throttle/Pedal Position Sensor "A" Minimum Stop Performance
P2110	Throttle Actuator Control System Forced Limited RPM
P2111	Throttle Actuator Control System Stuck Open
P2112	Throttle Actuator Control System Stuck Closed
P2113	Throttle/Pedal Position Sensor "B" Minimum Stop Performance
P2114	Throttle/Pedal Position Sensor "C" Minimum Stop Performance
P2115	Throttle/Pedal Position Sensor "D" Minimum Stop Performance
P2116	Throttle/Pedal Position Sensor "E" Minimum Stop Performance
P2117	Throttle/Pedal Position Sensor "F" Minimum Stop Performance
P2118	Throttle Actuator Control Motor Current Range/Performance
P2119	Throttle Actuator Control Throttle Body Range/Performance
P2120	Throttle/Pedal Position Sensor/Switch "D" Circuit Malfunction
P2121	Throttle/Pedal Position Sensor/Switch "D" Circuit Range/Performance
P2122	Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input
P2123	Throttle/Pedal Position Sensor/Switch "D" Circuit High Input
P2124	Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent
P2125	Throttle/Pedal Position Sensor/Switch "E" Circuit Malfunction
P2126	Throttle/Pedal Position Sensor/Switch "E" Circuit Range/Performance
P2127	Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input
P2128	Throttle/Pedal Position Sensor/Switch "E" Circuit High Input
P2129	Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent
P2130	Throttle/Pedal Position Sensor/Switch "F" Circuit Malfunction
P2131	Throttle/Pedal Position Sensor/Switch "F" Circuit Range/Performance
P2132	Throttle/Pedal Position Sensor/Switch "F" Circuit Low Input
P2133	Throttle/Pedal Position Sensor/Switch "F" Circuit High Input
P2134	Throttle/Pedal Position Sensor/Switch "F" Circuit Intermittent
P2135	Throttle Position Sensor A/B Voltage Correlation

The distinction is important:

• P2107 points specifically toward a TAC processor/control problem.

• P2108 indicates a TAC module/system performance problem.

• P2109 concerns minimum-stop performance of throttle/pedal sensor "A".

• P2110 indicates that the TAC system has forced limited engine RPM.

• P2111 indicates the throttle-control system is stuck open.

• P2112 indicates the throttle-control system is stuck closed.

• P2113–P2117 concern minimum-stop performance of specific throttle/pedal sensor channels.

• P2118 concerns throttle actuator motor current range/performance.

• P2119 concerns throttle-body range/performance.

• P2120–P2124 concern the "D" throttle/pedal sensor circuit.

• P2125–P2129 concern the "E" throttle/pedal sensor circuit.

• P2130–P2134 concern the "F" throttle/pedal sensor circuit.

• P2135 concerns throttle-position sensor A/B voltage correlation.

If P2107 is stored together with P2108, P2109, P2118, P2119, or P2135, the combination can help identify whether the problem is primarily related to processor operation, throttle-body performance, sensor feedback, or actuator control.

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How to Prevent P2107

Recommended practices include:

• Maintain the vehicle's battery and charging system.

• Keep battery terminals clean and secure.

• Maintain engine and chassis grounds.

• Protect TAC wiring from heat and abrasion.

• Keep electrical connectors clean and dry.

• Follow the manufacturer's procedure when servicing the throttle body.

• Perform required throttle adaptation after applicable repairs.

• Keep ECM/TAC software up to date when manufacturer updates are available.

• Avoid poorly installed electrical modifications.

• Address low-voltage problems promptly.

• Do not ignore electronic throttle warnings.

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Final Thoughts

The P2107 Throttle Actuator Control Module Processor diagnostic trouble code indicates that the vehicle's control system has detected a processor-related fault within the electronic throttle actuator-control system.

Possible causes include:

• Internal TAC module failure

• ECM/PCM processor problems

• Software or calibration errors

• Low battery voltage

• Charging-system problems

• Poor power supply

• Poor module grounds

• Damaged wiring

• Corroded connectors

• CAN communication problems

• Throttle-body electronic faults

• Throttle actuator motor problems

• Throttle plate binding

• Accelerator-pedal sensor problems

• Throttle-position sensor problems

The most important point is that P2107 does not automatically mean that the ECM, TAC module, or throttle body must be replaced.

A proper diagnosis should begin by scanning for additional codes and reviewing freeze-frame data. The technician should then verify battery voltage, module power and grounds, communication circuits, throttle and accelerator-pedal sensor signals, actuator operation, wiring and connectors, and manufacturer-specific software updates.

If the vehicle has normal throttle response and no drivability symptoms, the fault may be intermittent or related to a temporary electrical/software event. If the vehicle has reduced power, unpredictable accelerator response, stalling, or limp mode, P2107 should be treated as a high-priority fault because reliable electronic throttle control is essential for safe engine operation.