Throttle/Fuel Inhibit Circuit High
The P2555 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the throttle/fuel inhibit circuit. This circuit is responsible for preventing throttle and fuel delivery under certain conditions, such as during a crash or when the vehicle is in a reduced power mode. A high voltage reading suggests a short to power, a faulty sensor, or an issue with the PCM itself.
01. Most Common Causes
- Faulty throttle/fuel inhibit relay
- Short to power in the inhibit circuit wiring
- Corroded or damaged connector
- Faulty PCM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Engine stalls or fails to start
- Poor acceleration
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the throttle/fuel inhibit relay and related wiring for damage or corrosion.
Step 3: Test the circuit voltage with a multimeter to identify a short to power.
Step 4: Check the PCM for any signs of failure or reprogramming needs.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as the vehicle may enter limp mode or stall unexpectedly, posing a safety risk.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for relay replacement or wiring repair, but PCM replacement can be more expensive.