P2105 critical

Throttle Actuator Control System -- Forced Engine Shutdown

The P2105 code means the vehicle's onboard diagnostic system has detected: Throttle Actuator Control System -- Forced Engine Shutdown. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $200 - $1,200 (parts and labor)

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Common Symptoms

Engine shuts off unexpectedly
Engine will not restart
Reduced power warning before shutdown
Multiple throttle system warning lights
Check engine light on

Probable Causes (Ranked by Likelihood)

Critical electronic throttle system failure Very High
Multiple throttle position sensor faults High
Throttle plate stuck open -- safety shutdown Moderate
Major wiring harness failure in throttle system Moderate
PCM throttle control module failure Low

Step-by-Step Diagnostic Procedure

Check for all stored and pending trouble codes -- multiple throttle codes are expected
Inspect electronic throttle body for mechanical issues -- plate should move freely
Test all accelerator pedal position sensor signals and throttle position sensor signals
Inspect the entire throttle control wiring harness for damage, rodent chews, or connector issues
If throttle body and wiring test good, PCM may need replacement and programming

Frequently Asked Questions

Can I drive with code P2105?

No. The PCM has shut down the engine because it detected a critical safety issue with the throttle control system. The vehicle should be towed to a repair facility. Do not attempt to bypass this safety system.

Why did my engine shut off on its own?

The PCM performs continuous monitoring of the electronic throttle system. If it detects a condition that could lead to unintended acceleration (such as a throttle stuck open or conflicting sensor signals), it shuts the engine down as a last-resort safety measure.

Is this a common problem?

Forced engine shutdown from throttle system faults is relatively rare and typically occurs only when multiple failures happen simultaneously. It is more common in vehicles with high mileage, rodent-damaged wiring, or after improper repairs to the throttle system.