OBD-II Generic Error Code P2620: How to Fix It

Q: Can I drive my car safely with a P2620 code?

It depends on your symptoms. If your vehicle has entered limp mode (reduced power, RPM capped), it is not safe for highway driving and you should minimize driving until repaired. If the vehicle drives normally but the check engine light is on, you can drive short distances cautiously, but the issue should be addressed promptly as it can worsen and lead to sudden loss of throttle response.

Q: What is the most common cause of the P2620 code?

The most common causes are a failed or worn throttle position sensor, corroded or damaged wiring and connectors at the throttle body, or heavy carbon buildup inside the throttle body interfering with sensor operation. On high-mileage vehicles, the TPS or throttle body assembly is often the culprit. In rarer cases, a faulty ECM can trigger this code.

Q: How much does it cost to fix a P2620 error code?

Costs vary widely depending on the root cause and your vehicle. Cleaning the throttle body yourself costs $10–$20 for cleaner. A replacement throttle position sensor ranges from $20–$80 for parts. A full throttle body assembly replacement can cost $150–$600 for parts, plus $100–$250 in labor at a shop. ECM replacement is the most expensive option, potentially $500–$1,500 or more including programming.

Q: Will cleaning the throttle body fix P2620?

Sometimes, yes. If carbon buildup is restricting the throttle plate or interfering with the sensor's ability to read plate position accurately, cleaning the throttle body and performing a relearn procedure can resolve P2620. However, if the sensor itself has failed electrically or the wiring is damaged, cleaning alone will not fix it.

Q: Is P2620 the same as P0120 or P2135?

They are related but not identical. P0120 refers to the throttle position sensor A circuit malfunction in general. P2135 indicates a correlation fault between two throttle position sensors (common on drive-by-wire systems). P2620 specifically targets the throttle position output circuit, meaning the signal being sent FROM the throttle position sensor to the ECM is at fault. You may see these codes appear together, which can help narrow down whether the problem is in the sensor, wiring, or ECM.

Abstract

The P2620 error code indicates a problem with the throttle position output circuit — specifically, the signal your throttle body sends to the ECM/PCM (engine control module) is outside the expected range or has failed entirely. This can result in rough idling, hesitation during acceleration, reduced engine power, or the vehicle entering 'limp mode' to protect the engine. Left unaddressed, a faulty throttle position circuit can worsen fuel economy and potentially cause unsafe driving conditions.