OBD-II Generic Error Code P2555: How to Fix It

Q: What does OBD-II code P2555 mean?

P2555 means the engine control module has detected a higher-than-expected voltage in the throttle or fuel inhibit circuit. This circuit is responsible for cutting or limiting throttle response and fuel delivery under specific conditions, and an abnormally high signal tells the ECM something is wrong with that circuit.

Q: Can I drive my car with a P2555 code?

It depends on the severity of the symptoms. If the vehicle is in limp mode, has reduced power, or is stalling, driving it is not recommended as it could worsen damage and create a safety hazard. If the vehicle drives normally and the check engine light is the only symptom, short-distance driving may be acceptable, but the fault should be diagnosed and repaired as soon as possible.

Q: What are the most common causes of P2555?

The most common causes include a faulty inhibit switch (such as a brake pedal switch, clutch switch, or neutral safety switch), damaged or corroded wiring in the throttle or fuel inhibit circuit, a stuck or failed fuel inhibit relay, a defective throttle position sensor, or in rare cases, a failing engine control module.

Q: How much does it cost to fix a P2555 code?

Repair costs vary widely depending on the root cause. Replacing a simple inhibit switch or relay typically costs between $50 and $200 including parts and labor. Wiring repairs can range from $100 to $400. A throttle position sensor replacement runs approximately $100 to $300. ECM replacement or reprogramming is the most expensive option, often ranging from $500 to $1,500 or more depending on the vehicle.

Q: Will P2555 clear itself after the problem is fixed?

In most cases, the code will not clear itself automatically right away — you will need to use an OBD-II scanner to manually clear it after repairing the fault. However, if the underlying issue is resolved, the code will not return after the ECM completes its self-diagnostic drive cycle. If you do not clear it manually, some vehicles will automatically clear stored codes after a set number of successful drive cycles without the fault recurring.

Abstract

OBD-II code P2555 indicates that the throttle or fuel inhibit circuit is reading a voltage signal that is higher than expected by the engine control module (ECM). This circuit is designed to cut throttle response or fuel delivery under certain conditions, and when it sends an abnormally high signal, the ECM stores this fault and may trigger a check engine light or limp mode. Common causes include a faulty sensor or switch, damaged wiring, a bad relay, or a failing ECM.