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Sierra 1500 HD

P1516 engine code and reduced engine power message

Hello, and thank you for writing in. The P1516 code you received stands for an issue with the Throttle Actuator Control Module. The throttle body, the actuator module, and the wiring may all need to be inspected. The TAC module...

Rpm's started to rise to around 1400 when idling and a dash message lit up saying reduce engine power.

Hi there. Check the idle air control valve (IAC) on your vehicle. This valve is what controls the idle and is most likely stuck or has failed. When turning off the vehicle and then turning it back on, the valve...