What are the possible causes of the Chevrolet P129D code?
- Faulty fuel pump power control module
- Open or short circuit in the fuel pump power control module harness
- Poor electrical connection in the fuel pump power control module circuit
How to fix the Chevrolet P129D code?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
What are the possible symptoms of the Chevrolet P129D code?
- Check Engine Light on (or Service Engine Soon warning light)
What does the Chevrolet P129D code mean?
The fuel pump power control module monitors the ignition voltage circuit to determine if the voltage is within the normal operating range. The Diagnostic Trouble Code (DTC) will be set when the voltage of the fuel pump power control module ignition switch circuit is below a calibrated value for 1 second.
Chevrolet P129D code – Low voltage in the fuel pump driver control module run/start switch circuit