GM P1518 Error Code: How to Fix It

Q: Can I drive with GM error code P1518?

You can drive short distances at low speeds, but the vehicle may have reduced power, poor acceleration, and unpredictable throttle response. Avoid highway driving and get it repaired as soon as possible for safety.

Q: What causes GM P1518 error code?

Common causes include faulty throttle body, damaged wiring harness, loose electrical connections, corroded ground connections, or a failing engine control module. Water damage and age-related wear are frequent culprits.

Q: How much does it cost to fix P1518 on a GM vehicle?

Repair costs range from $150-800 depending on the root cause. Simple wiring repairs cost $150-300, throttle body replacement runs $400-600, while ECM replacement can cost $600-800 plus programming.

Q: Will P1518 cause my GM to fail emissions testing?

Yes, P1518 will likely cause your vehicle to fail emissions testing since it's a powertrain-related code that affects engine performance and fuel delivery systems.

Q: How do I reset the throttle position sensor after fixing P1518?

Perform the throttle relearn procedure: idle for 2 minutes, turn off for 10 seconds, restart and idle for 2 minutes, then drive normally for 15-20 minutes. This allows the ECM to relearn proper throttle positions.

Abstract

GM error code P1518 indicates a TAC (Throttle Actuator Control) serial data link malfunction, meaning the engine control module cannot properly communicate with the throttle body. This can cause poor acceleration, rough idling, and reduced fuel economy.