What Does P2555 Mean?
The PCM has detected an abnormally high voltage in the throttle or fuel inhibit circuit. This circuit allows the PCM to shut off fuel delivery or throttle operation under certain conditions like anti-theft activation or transmission protection modes.
Safety Warning
Vehicle may enter limp mode or fail to start, potentially causing sudden power loss or no-start condition. Do not drive until repaired.
Common Causes
35%
Shorted wiring or connector in the throttle/fuel inhibit circuit causing high voltage
30%
Faulty anti-theft system or immobilizer module sending incorrect signal
20%
PCM internal fault or software issue affecting circuit monitoring
15%
Faulty throttle actuator control module or relay stuck closed
Diagnostic Steps
1
Step 1: Check for related anti-theft or security system codes and verify system is not in theft deterrent mode
2
Step 2: Inspect wiring harness and connectors for the throttle/fuel inhibit circuit for shorts to voltage or damaged insulation
3
Step 3: Test circuit voltage at the inhibit relay or solenoid with key on, engine off (should typically read low/ground when not activated)
4
Step 4: Check for TSBs related to PCM software updates for false inhibit circuit codes
5
Step 5: If all wiring checks pass, test PCM driver circuit by monitoring inhibit signal during commanded activation
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally high voltage in the throttle or fuel inhibit circuit. This circuit allows the PCM to shut off fuel delivery or throttle operation under certain conditions like anti-theft activation or transmission protection modes.
The most common cause of P2555 (Throttle/Fuel Inhibit Circuit High) is: Shorted wiring or connector in the throttle/fuel inhibit circuit causing high voltage
Typical repair costs for P2555 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may enter limp mode or fail to start, potentially causing sudden power loss or no-start condition. Do not drive until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2555 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Control/Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
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