Throttle/Fuel Inhibit Circuit Malfunction
The P2552 code indicates a fault in the throttle/fuel inhibit circuit, which is part of the engine control system that prevents unintended acceleration or fuel delivery under certain conditions. This circuit typically involves the powertrain control module (PCM) monitoring a signal from the throttle position sensor or fuel system to inhibit throttle response or fuel injection when a fault is detected. A malfunction can cause the PCM to limit engine power or enter a fail-safe mode, potentially affecting drivability.
01. Most Common Causes
- Faulty throttle position sensor (TPS)
- Wiring or connector issues in the inhibit circuit
- Malfunctioning PCM or software glitch
- Corroded or loose electrical connections
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Unresponsive throttle pedal
- Engine stalling or hesitation
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the throttle body wiring and connectors for damage or corrosion.
Step 3: Test the throttle position sensor signal with a multimeter per manufacturer specs.
Step 4: Check for PCM software updates or perform a PCM reset if no hardware faults found.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause sudden loss of power or unintended acceleration, posing a safety risk. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $100 to $300, depending on the root cause. Replacing a throttle position sensor may cost $50-$150, while PCM reprogramming or replacement can be higher.