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.
- Keep driving?
- No — stop driving
- DIY difficulty
- hard
- Estimated cost
- $200 - $1,200 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
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
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.
Mechanics Guide Step-by-step diagnosis
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
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2007-2017 Chevrolet Silverado
- 2008-2018 Chrysler/Dodge vehicles
- 2009-2019 Ford F-150
- 2006-2016 Toyota Camry
- 2010-2020 Nissan Altima
Related Codes
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.