P2552
Throttle/Fuel Inhibit A Circuit
Throttle / fuel control
Generic OBD-II
Medium
What it means
P2552 means the ECM has detected a fault in the "A" throttle/fuel inhibit circuit — a signal used to limit throttle or fuel delivery under certain conditions for safety or driveline protection. It's typically a wiring, connector, or module-signal problem. The engine usually still runs, but because this circuit can restrict power, the vehicle may enter a reduced-power mode until the fault is repaired.
Medium
Can I keep driving? Usually yes, but the engine may drop into reduced power if the inhibit signal is misread — drive gently until fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Possible reduced power or limp/failsafe mode
- Hesitation or restricted throttle response in some cases
- Sometimes no obvious symptom beyond the stored code
Common causes
Most likely first
- Open or shorted wiring in the throttle/fuel inhibit 'A' circuitLikely
- Corroded or loose connector on the inhibit circuitCommon
- Fault in the module or switch that sends the inhibit signalCommon
- Poor ground or reference on the circuitLess often
- Faulty ECM/PCM input (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for related throttle or torque-management codes.
- Inspect the inhibit-circuit wiring and connectors for opens, shorts, or corrosion.
- Check the circuit for continuity and correct signal levels back to the ECM.
- Verify the module or switch driving the inhibit signal is operating correctly.
- Repair the wiring or replace the faulty component, clear the code, and confirm normal power delivery.
FAQ
Quick answers
Is it safe to drive with P2552?+
Often yes, but the throttle/fuel inhibit function can limit power for safety. If the car goes into reduced power, drive gently and get it diagnosed promptly.
Can I just clear P2552?+
You can, but a wiring or module fault will set it again and may keep limiting power. Fix the circuit first.
Related codes
Often seen with P2552
Read & clear P2552 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX