P2105 Throttle Actuator Control System - Forced Engine Shutdown

The P2105 Throttle Actuator Control System – Forced Engine Shutdown diagnostic trouble code indicates that the Engine Control Module (ECM/PCM) has intentionally commanded the engine to shut down because a serious fault has been detected within the electronic throttle-control system or another related engine-management system.

In simple terms, the vehicle's computer has determined that continuing to operate the engine normally may not be safe or reliable, so it has activated a forced engine-shutdown strategy.

Modern vehicles use Electronic Throttle Control (ETC), also known as Throttle Actuator Control (TAC), instead of a traditional mechanical accelerator cable. The ECM continuously monitors accelerator-pedal sensors, throttle-position sensors, the throttle actuator motor, throttle-body operation, electrical circuits, and related control systems.

When the ECM enters a shutdown strategy, it may store P2105.

The most important point is that P2105 usually does not identify the original component that failed. Like P2106, it can be a consequence or strategy code indicating what the ECM has decided to do in response to another fault.

Possible symptoms include:

• Engine shutdown

• Engine that will not start

• Sudden loss of power

• Limp mode before shutdown

• Check Engine Light

• Electronic throttle warning

• Reduced Power warning

• Accelerator pedal becoming unresponsive

• Stalling

• Cruise-control deactivation

• Multiple throttle or engine-management trouble codes

Because P2105 involves an intentional engine-shutdown strategy, it should be considered a high-priority diagnostic code.

---

What Does P2105 Mean?

P2105 means the ECM/PCM has commanded the Throttle Actuator Control system into a condition where the engine is forced to shut down.

The code contains two important concepts:

Throttle Actuator Control System

The TAC system electronically controls throttle operation.

Depending on the vehicle, it can involve:

• Accelerator-pedal position sensors

• Electronic throttle body

• Throttle actuator motor

• Throttle-position sensors

• ECM/PCM

• TAC control module

• Wiring

• Connectors

• Power and ground circuits

• CAN communication

• Software and calibration

Forced Engine Shutdown

This means the ECM has deliberately commanded an engine shutdown rather than simply detecting poor throttle performance.

The shutdown strategy is designed to prevent continued engine operation when the control system determines that throttle control or another critical condition cannot be trusted.

---

Is P2105 the Root Cause?

Usually, no.

P2105 often tells you what the ECM did rather than why it did it.

For example, a vehicle may develop a throttle-position sensor correlation problem.

The sequence could be:

Throttle sensor disagreement → ECM detects unsafe throttle condition → ECM activates fail-safe strategy → engine shutdown → P2105 stored

In this situation, P2105 is the result of the original sensor or circuit fault.

Other codes stored at the same time may be much more useful.

Possible related codes include:

• P2100

• P2101

• P2102

• P2103

• P2104

• P2106

• P2107

• P2108

• P2109

• P2110

• P2111

• P2112

• P2113

• P2114

• P2115

• P2116

• P2117

• P2118

• P2119

• P2120–P2129

• P2130–P2140

The exact combination depends on the vehicle.

---

How Does Electronic Throttle Control Work?

A typical ETC system operates through several stages:

1. The driver presses the accelerator pedal.

2. Accelerator-pedal position sensors measure pedal movement.

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

4. The ECM calculates the requested engine 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 throttle position.

8. The ECM compares the commanded and actual positions.

9. The control system continuously monitors sensor correlation and actuator operation.

10. If a serious fault is detected, the ECM activates a fail-safe strategy.

11. Depending on the severity and vehicle design, the ECM may limit power, limit RPM, or command an engine shutdown.

12. P2105 may be stored when the forced-shutdown strategy is activated.

The redundant sensors and monitoring systems are important because the electronic throttle directly affects engine torque and acceleration.

---

Why Would the ECM Shut the Engine Down?

An engine shutdown strategy may be used when the ECM determines that it cannot reliably control engine torque or throttle position.

Possible triggers include:

• Severe throttle-position sensor disagreement

• Accelerator-pedal sensor disagreement

• Throttle actuator malfunction

• Throttle body failure

• Throttle plate stuck in an unsafe position

• Serious electrical fault

• 5-volt reference failure

• Sensor-ground failure

• Processor fault

• Communication failure

• Severe system-voltage problem

• Other manufacturer-specific engine-management faults

The exact conditions that cause P2105 vary between manufacturers.

---

Symptoms of P2105

Engine Shuts Down

The most obvious symptom is that the engine may shut off.

The shutdown may occur:

• During acceleration

• At idle

• While driving

• During a throttle-control fault

• Immediately after starting

The exact behavior depends on the vehicle's fail-safe strategy.

---

Engine Will Not Start

In some cases, the ECM may continue to prevent normal engine operation until the underlying fault is corrected.

---

Sudden Loss of Engine Power

The vehicle may lose power before the engine shuts down.

---

Accelerator Pedal Becomes Unresponsive

The accelerator may stop producing normal throttle response.

---

Limp Mode

Some vehicles may first enter a reduced-power mode before a shutdown strategy is activated.

---

Check Engine Light

The Check Engine Light commonly illuminates.

---

Reduced Power Warning

Some vehicles may display:

Reduced Engine Power

or a similar manufacturer-specific warning.

---

Electronic Throttle Warning

A throttle-control warning may appear on the instrument panel.

---

Engine Stalling

Repeated stalling may occur if the underlying fault continues.

---

Cruise Control Deactivation

Cruise control may be disabled because the electronic throttle cannot be reliably controlled.

---

Multiple Warning Lights

Depending on the vehicle, additional warnings may involve:

• Traction control

• Stability control

• Electronic throttle

• Engine management

• Reduced power

---

Common Causes of P2105

Because P2105 can be a strategy code, the underlying cause can vary significantly.

Severe Throttle Position Sensor Problem

The electronic throttle body commonly uses redundant position sensors.

If the signals disagree significantly, the ECM may determine that reliable throttle control is impossible.

Possible problems include:

• Sensor failure

• Signal dropout

• Incorrect voltage

• Erratic output

• Internal sensor wear

• Correlation failure

---

Accelerator Pedal Position Sensor Problem

The accelerator pedal typically contains redundant position sensors.

A serious disagreement between pedal-position signals can cause the ECM to reject the driver's requested throttle position.

Possible causes include:

• Failed pedal sensor

• Wiring fault

• Connector problem

• Signal dropout

• Internal pedal assembly failure

---

Electronic Throttle Body Failure

A faulty throttle body can cause P2105.

Possible failures include:

• Internal position sensor failure

• Actuator motor failure

• Internal electronic failure

• Damaged gears

• Mechanical binding

• Throttle plate problems

---

Throttle Actuator Motor Failure

The actuator motor physically moves the throttle plate.

Possible faults include:

• Open circuit

• Short circuit

• Excessive current

• Insufficient current

• Motor wear

• Mechanical resistance

---

Throttle Plate Stuck

A throttle plate that cannot move to the commanded position can create an unsafe operating condition.

Possible causes include:

• Carbon buildup

• Foreign material

• Mechanical damage

• Internal gear failure

• Throttle shaft problems

---

Dirty Throttle Body

Heavy carbon deposits can interfere with throttle-plate movement.

However, P2105 does not automatically mean that the throttle body needs cleaning.

A dirty throttle body should only be considered the cause when inspection and testing support that conclusion.

---

Wiring Problems

The TAC system contains multiple electrical circuits.

Possible wiring problems include:

• Broken wires

• Chafing

• Melted insulation

• Heat damage

• Pinched wiring

• Short to ground

• Short to voltage

• Open circuits

---

Connector Problems

Poor connections can create intermittent or severe throttle-control faults.

Inspect for:

• Corrosion

• Water intrusion

• Loose terminals

• Bent pins

• Backed-out terminals

• Damaged connector housings

---

5-Volt Reference Failure

Many accelerator and throttle sensors use a regulated 5-volt reference.

If another sensor or wiring fault pulls this reference circuit down or raises it abnormally, multiple sensor signals can become incorrect.

This can produce several trouble codes simultaneously.

---

Sensor Ground Problem

A poor sensor ground can create incorrect sensor voltage readings.

Possible causes include:

• Corrosion

• Loose ground

• High resistance

• Damaged wiring

• Poor engine/chassis ground

---

Low Battery Voltage

Low system voltage can interfere with electronic throttle operation and module processing.

P2105 should therefore be investigated alongside any battery or voltage-related trouble codes.

---

Alternator or Charging-System Failure

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

Possible effects include:

• ECM malfunction

• Throttle actuator problems

• Sensor errors

• Communication problems

• Module resets

---

TAC Module Processor Fault

Some vehicles use a dedicated TAC control module or separate throttle-control electronics.

Processor problems can cause severe throttle-control faults.

Related codes may include:

• P2107

• P2108

---

ECM/PCM Problem

On some vehicles, throttle-control processing is integrated into the ECM/PCM.

An internal ECM/PCM problem can therefore potentially cause a forced-shutdown strategy.

However, module replacement should only be considered after the related power, ground, wiring, communication, sensor, and actuator circuits have been properly tested.

---

CAN Communication Problem

Electronic throttle systems can depend on communication between multiple modules.

A communication failure may cause the system to enter a fail-safe state.

Possible causes include:

• CAN-H wiring problems

• CAN-L wiring problems

• Short circuits

• Open circuits

• Module power loss

• Poor grounds

• Connector faults

---

Software or Calibration Problem

Incorrect module software or calibration can sometimes contribute to abnormal fail-safe operation.

Possible solutions include:

• ECM software update

• Module reprogramming

• Calibration update

• Manufacturer-specific relearn procedure

---

Other Serious Engine Faults

Depending on the vehicle manufacturer, another serious engine-management fault may cause the ECM to activate a forced-shutdown strategy.

This is another reason why all stored codes should be considered together.

---

Vehicles Commonly Affected by P2105

P2105 can occur on many vehicles equipped with electronic throttle-control systems.

Examples 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 conditions that trigger P2105 and the resulting fail-safe behavior can differ between manufacturers, engines, model years, and throttle-control systems.

---

How Is P2105 Diagnosed?

P2105 requires careful diagnosis because it can be the result of another fault.

The correct approach is to determine:

Why did the ECM decide that engine shutdown was necessary?

---

Step 1: Scan All Control Modules

Use a suitable diagnostic scan tool to retrieve all stored, pending, and manufacturer-specific codes.

Look for faults involving:

• Throttle position

• Accelerator pedal

• Throttle actuator

• Throttle motor

• Minimum-stop performance

• Maximum-stop performance

• Sensor correlation

• 5-volt reference

• Sensor ground

• Battery voltage

• CAN communication

• Engine management

A related code may identify the root cause much more directly than P2105.

---

Step 2: Check Freeze-Frame Data

Review the conditions present when P2105 was stored.

Important information includes:

• Engine RPM

• Vehicle speed

• Accelerator-pedal position

• Throttle position

• Commanded throttle position

• Battery voltage

• Engine load

• Engine coolant temperature

Determine whether the fault occurred during:

• Startup

• Idle

• Acceleration

• Deceleration

• High RPM

• High load

• Low voltage

• A particular temperature

---

Step 3: Determine Whether P2105 Is Current or Historical

Check whether the code is:

• Active

• Pending

• Stored/history

• Intermittent

If the engine currently operates normally and P2105 is only stored in history, investigate when and why the shutdown strategy was previously activated.

---

Step 4: Check Accelerator-Pedal Sensor Signals

Monitor the redundant accelerator-pedal sensor signals.

The signals should change smoothly and maintain the manufacturer's specified relationship.

Look for:

• Dropouts

• Sudden voltage changes

• Dead spots

• Signal jumps

• Sensor disagreement

• Incorrect minimum values

• Incorrect maximum values

---

Step 5: Check Throttle-Position Sensor Signals

Monitor the redundant throttle-position signals.

Compare the sensor channels throughout the throttle's operating range.

Look for:

• Correlation errors

• Dropouts

• Sudden jumps

• Incorrect closed-throttle readings

• Incorrect maximum readings

---

Step 6: Compare Commanded and Actual Throttle Position

This is a critical diagnostic test.

Compare:

Commanded throttle position

with

Actual throttle position

If the ECM commands the throttle to move but the throttle does not follow, investigate:

• Throttle actuator motor

• Throttle body

• Mechanical binding

• Wiring

• Position sensors

---

Step 7: Inspect the Throttle Body

Inspect for:

• Carbon deposits

• Dirt

• Foreign objects

• Mechanical damage

• Binding

• Damaged gears

• Signs of overheating

If cleaning is appropriate, use the manufacturer's recommended procedure.

Do not force an electronic throttle plate manually if the manufacturer prohibits it.

---

Step 8: Test the Throttle Actuator

Where supported by the manufacturer's diagnostic procedure, check:

• Actuator motor operation

• Motor current

• Circuit continuity

• Short circuits

• Mechanical resistance

• Throttle movement

An actuator that draws excessive current may indicate mechanical binding or internal failure.

---

Step 9: Inspect the Accelerator Pedal

Check the pedal assembly and its wiring.

Look for:

• Damaged wiring

• Loose connectors

• Sensor problems

• Abnormal live data

• Physical damage

---

Step 10: Check the 5-Volt Reference

Verify the sensor reference circuit according to manufacturer specifications.

If multiple sensors share the same reference circuit, determine whether another sensor is pulling the voltage outside its normal range.

---

Step 11: Check Sensor Grounds

Perform a proper ground and voltage-drop test.

A ground can look visually acceptable but still have excessive resistance.

---

Step 12: Inspect TAC Wiring and Connectors

Inspect the complete wiring harness.

Look for:

• Chafing

• Broken wires

• Heat damage

• Melted insulation

• Corrosion

• Water intrusion

• Loose terminals

• Backed-out pins

---

Step 13: Perform a Wiggle Test

While monitoring throttle and pedal sensor data, carefully move the relevant wiring harnesses and connectors.

If the signal changes unexpectedly, investigate the wiring or connector.

---

Step 14: Check Battery and Charging System

Verify:

• Battery condition

• Battery terminals

• Charging voltage

• Alternator operation

• Voltage stability

• Engine grounds

• Chassis grounds

If P2105 occurred during a low-voltage event, the electrical system may be the actual cause.

---

Step 15: Check CAN Communication

If the vehicle uses CAN communication for throttle control, check:

• CAN-H

• CAN-L

• Network resistance

• Module power

• Module grounds

• Communication connectors

• Related U-codes

---

Step 16: Check Manufacturer Service Information

Look for:

• Technical Service Bulletins

• Software updates

• Known throttle-body problems

• Known pedal-sensor failures

• Wiring issues

• Connector repairs

• Calibration updates

• Required relearn procedures

---

Step 17: Perform Required Throttle Relearn

After applicable throttle-body, pedal, ECM, or electrical repairs, perform the required manufacturer-specific throttle adaptation or relearn procedure.

This may be necessary after:

• Throttle-body cleaning

• Throttle-body replacement

• Accelerator-pedal replacement

• Battery disconnection

• ECM replacement

• Module replacement

---

How to Fix P2105

There is no universal repair for P2105 because the code generally indicates that the ECM has activated a forced engine-shutdown strategy.

The repair depends on the underlying fault.

Repair Accelerator-Pedal Sensor Problems

If testing confirms a defective accelerator-pedal position sensor or pedal assembly, replace the affected component.

---

Repair Throttle-Position Sensor Problems

If the throttle-position sensors are integrated into the throttle body and testing confirms failure, the throttle-body assembly may need to be replaced.

---

Repair or Replace the Throttle Body

Replace the throttle body if testing confirms:

• Internal sensor failure

• Actuator motor failure

• Internal electronic failure

• Mechanical binding

• Internal gear damage

---

Clean the Throttle Body

If carbon buildup is confirmed as the cause of mechanical interference, clean the throttle body using the manufacturer's recommended procedure.

Perform any required throttle adaptation afterward.

---

Repair Wiring

Repair or replace damaged wiring caused by:

• Heat

• Chafing

• Vibration

• Corrosion

• Pinching

• Short circuits

---

Repair Connectors

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

---

Repair 5-Volt Reference Problems

If a sensor or wiring fault is affecting the reference circuit, repair the circuit or replace the confirmed faulty component.

---

Repair Ground Problems

Correct:

• Corroded grounds

• Loose grounds

• High-resistance connections

• Damaged ground wires

---

Repair Battery or Charging Problems

Correct:

• Weak battery

• Loose battery connections

• Alternator failure

• Voltage-regulator problems

• Charging-system faults

---

Repair CAN Communication Problems

Repair confirmed communication wiring, connector, power, ground, or network faults.

---

Update or Reprogram the ECM/PCM

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

---

Replace the TAC Module

If the vehicle has a separate TAC module and testing confirms an internal processor or electronic failure, replace and program the module according to manufacturer procedures.

---

Replace the ECM/PCM

ECM/PCM replacement should generally be the last step, after the following have been tested:

• Power supply

• Grounds

• Wiring

• Connectors

• Accelerator-pedal sensors

• Throttle-position sensors

• Throttle actuator

• Throttle body

• 5-volt reference

• Communication circuits

• Software and calibration

---

What Happens If P2105 Is Ignored?

P2105 should not be ignored.

Unlike a code that only indicates an emissions problem, P2105 indicates that the ECM has activated a strategy capable of shutting the engine down.

Possible consequences include:

• Engine stalling

• Engine shutdown

• No-start condition

• Sudden loss of power

• Unresponsive accelerator

• Limp mode

• Limited vehicle control

• Additional throttle-control faults

If the engine shuts down while driving, the vehicle can lose power assistance for systems such as steering and braking depending on the vehicle design and operating conditions.

---

Can You Drive With P2105?

Driving with P2105 is generally not recommended.

If the engine has already shut down or is repeatedly entering a fail-safe strategy, continued driving may be unsafe.

Do not continue driving if the vehicle has:

• Repeated engine shutdown

• Sudden loss of power

• Unresponsive accelerator

• Severe throttle hesitation

• Repeated stalling

• Electronic throttle warnings

• Reduced Power warnings

• Difficulty restarting

• Unpredictable engine operation

If the vehicle currently runs normally and P2105 is only stored as a historical code, the immediate behavior may be different. Nevertheless, the reason for the previous shutdown should be diagnosed before assuming the issue has disappeared.

---

Is P2105 a Serious Code?

P2105 is generally considered a high-severity diagnostic trouble code.

The code indicates that the ECM/PCM has commanded or entered a strategy involving forced engine shutdown.

The seriousness is especially high if the vehicle:

• Shuts down while driving

• Will not restart

• Has unpredictable throttle response

• Enters reduced-power mode

• Stalls repeatedly

• Displays multiple throttle-control warnings

The most important issue is the underlying failure that caused the ECM to activate the shutdown strategy.

---

P2105 vs. Related Throttle Actuator Codes

Code	General Description
P2105	Throttle Actuator Control System – Forced Engine Shutdown
P2106	Throttle Actuator Control System – Forced Limited Power
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:

• P2105 indicates forced engine shutdown.

• P2106 indicates forced limited power.

• P2107 points toward a TAC processor fault.

• P2108 indicates a TAC module/system performance problem.

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

• P2110 indicates forced limited RPM.

• P2111 indicates the throttle system is stuck open.

• P2112 indicates the throttle system is stuck closed.

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

• P2118 concerns throttle actuator motor current range/performance.

• P2119 concerns throttle-body range/performance.

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

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

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

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

In practice, P2105 combined with another specific throttle or sensor code is much more informative than P2105 by itself.

---

How to Prevent P2105

Preventing P2105 primarily means preventing the underlying throttle-control and electrical problems that can cause a forced shutdown.

Recommended practices include:

• Maintain the battery and charging system.

• Keep battery terminals clean and secure.

• Maintain engine and chassis grounds.

• Protect throttle-control wiring from heat and abrasion.

• Keep electrical connectors clean and dry.

• Address throttle and pedal sensor faults promptly.

• Follow manufacturer procedures when cleaning the throttle body.

• Perform required throttle adaptation after applicable service.

• Keep ECM software updated where manufacturer updates are available.

• Repair electrical problems promptly.

• Avoid poorly installed electrical modifications.

• Do not ignore Check Engine Light or electronic throttle warnings.

---

Final Thoughts

The P2105 Throttle Actuator Control System – Forced Engine Shutdown diagnostic trouble code indicates that the ECM/PCM has activated a forced engine-shutdown strategy because it has detected a condition that may prevent safe or reliable engine/throttle control.

Possible underlying causes include:

• Severe throttle-position sensor faults

• Accelerator-pedal sensor faults

• Electronic throttle-body failure

• Throttle actuator motor problems

• Throttle plate binding

• Heavy carbon buildup

• Wiring faults

• Connector problems

• 5-volt reference faults

• Sensor-ground problems

• Low battery voltage

• Charging-system faults

• TAC module processor problems

• ECM/PCM problems

• CAN communication faults

• Software or calibration problems

• Other serious engine-management faults

The critical diagnostic point is that P2105 often describes the ECM's response rather than the original failure.

A proper diagnosis should begin with a complete scan of all control modules and a review of freeze-frame data. Related codes should then be investigated before replacing expensive components. Battery voltage, charging voltage, module power and grounds, accelerator-pedal signals, throttle-position signals, throttle actuator operation, wiring, connectors, 5-volt reference circuits, communication networks, and software should be checked as appropriate.

Because P2105 can be associated with engine shutdown and loss of power while driving, it should be treated as a high-priority fault rather than simply cleared and ignored.