GM Vehicle Error Code P1516: How to Fix It

Q: Can I drive with GM code P1516?

You should avoid driving with P1516 as it can cause sudden loss of power or put the vehicle in limp mode. If you must drive, keep speeds low and avoid highway driving until the issue is resolved.

Q: How much does it cost to fix P1516 on a GM vehicle?

Repair costs vary depending on the cause. Throttle body cleaning costs $100-200 at a shop. If the throttle body needs replacement, expect $300-800 including parts and labor. Wiring repairs typically cost $150-400.

Q: What causes GM P1516 error code?

Common causes include carbon buildup in the throttle body, faulty throttle position sensors, damaged wiring, loose connections, or internal throttle body actuator motor failure.

Q: Will P1516 cause my GM vehicle to fail emissions?

Yes, P1516 will likely cause your vehicle to fail an emissions test as it's an active diagnostic trouble code related to the engine management system.

Q: How do I reset the throttle position sensor on a GM vehicle?

Most GM vehicles require a specific throttle relearn procedure using a professional scanner. Basic steps include clearing codes, starting the engine, letting it idle for 2-3 minutes, then turning it off and restarting after 10 seconds.

Abstract

GM error code P1516 indicates a problem with the Throttle Actuator Control (TAC) system, specifically that the throttle position sensor readings don't match the commanded throttle position. This can cause reduced engine power, rough idling, or the vehicle entering 'limp mode' to prevent engine damage.