P2552 — Throttle/Fuel Inhibit A Circuit
General electrical fault on the throttle/fuel inhibit input A. This input lets external safety functions (immobilizer, hybrid HV interlock, anti-theft) override the throttle or cut fuel delivery. With the input invalid the safety override is unreliable, so the ECM falls back to its safe default — typically inhibit asserted to err on the side of safety.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Throttle inhibit a
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Open or shorted inhibit wire
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.