P1518high severityPowertrain
Throttle Actuator Control Module Serial Data Circuit
on 2008 Chevrolet Impala 3.5L V6 · FWD
What this code means
The PCM is not receiving serial data from the Throttle Actuator Control module. This communication failure prevents proper throttle control.
Symptoms
- Reduced Engine Power
- Check Engine Light
- Throttle not responding
- Vehicle may not accelerate
- Stalling
Common causes
- TAC module failure
- Serial data circuit wiring damage
- Corroded connector
- PCM failure
- CAN bus issue
Diagnostic steps
- Check TAC module power supply
- Test serial data communication
- Inspect wiring between TAC and PCM
- Check for CAN bus faults
- Test TAC module
Repair notes
Repair communication wiring or replace TAC module.
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