2003 Chevrolet Silverado P1516, P1518, P0650 Faults and No Tachometer Reading
My 2003 Chevrolet Silverado is not turning over and displays fault codes P1516, P1518, and P0650. I've noticed that both the tachometer and the check engine light (MIL) are part of the same circuit. The issue appears to be related to the neutral safety switch—possibly preventing the vehicle from starting. However, I'm not certain whether this is the root cause or if there's another underlying electrical problem. Can someone explain how these fault codes relate to the no-start condition and whether the neutral safety switch could be responsible?
BBBind.com provides wiring diagrams. It's important to verify power and ground connections. Possible causes: - Faulty Throttle Actuator Control (TAC) module - Open or shorted TAC module harness - Poor electrical connection in the TAC module circuit - Check the TAC module connector for water damage - Binding or bent throttle plate, indicating a failed throttle body