What Does P2105 Mean?
The PCM has commanded complete engine shutdown through throttle closure due to detecting a critical fault that poses safety or engine damage risk. This is the most severe protective response in the throttle control system.
Safety Warning
Engine will shut down completely without warning, resulting in loss of power steering and brake assist. Extremely dangerous if occurs while driving; vehicle should be towed for diagnosis.
Common Causes
35%
Severe accelerator pedal position sensor fault or stuck pedal detection
25%
Critical throttle position sensor failure or correlation error between sensors
20%
Unintended acceleration detection or throttle actuator control malfunction
12%
PCM detecting critical engine overspeed or runaway condition
8%
Critical CAN bus communication failure between control modules
Diagnostic Steps
1
Step 1: Retrieve all DTCs from all modules and review freeze frame data to identify critical fault that triggered shutdown command
2
Step 2: Inspect accelerator pedal for mechanical binding, floor mat interference, or obstruction; verify pedal returns to rest position smoothly
3
Step 3: Monitor all accelerator pedal position sensor voltages and throttle position sensor voltages simultaneously; look for signal conflicts or out-of-range values
4
Step 4: Check for throttle actuator mechanical binding by manually operating throttle blade with key off; should move smoothly through full range
5
Step 5: Perform PCM software update check as forced shutdown logic may require calibration update for false triggering issues
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The PCM has commanded complete engine shutdown through throttle closure due to detecting a critical fault that poses safety or engine damage risk. This is the most severe protective response in the throttle control system.
The most common cause of P2105 (Throttle Actuator Control System - Forced Engine Shutdown) is: Severe accelerator pedal position sensor fault or stuck pedal detection
Typical repair costs for P2105 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine will shut down completely without warning, resulting in loss of power steering and brake assist. Extremely dangerous if occurs while driving; vehicle should be towed for diagnosis.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2105 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System / Safety System
Difficulty
Type
Generic (SAE)
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