P2552 — Problem with throttle or fuel control circuit

The code indicates an issue in the throttle or fuel inhibit circuit, which controls engine power delivery. It appears when the engine control module detects a fault preventing proper throttle or fuel operation, often to protect the engine or emissions system.

Common causes

The cause is almost always one of a few things. Here they are — P2552 rarely comes from anything outside this list:

• Faulty throttle position sensor or wiring
• Damaged or corroded connectors in throttle/fuel circuit
• Malfunctioning engine control module (ECM)
• Issues with accelerator pedal position sensor
• Blown fuse or relay related to throttle control

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Check and repair wiring and connectors in throttle/fuel circuit
2. Test and replace faulty sensors (throttle or pedal position)
3. Inspect and replace blown fuses or relays
4. Perform ECM diagnostics and reprogram or replace if needed
5. Replace throttle body assembly if all else fails

That is what holds for P2552 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.