What are the possible causes of code P129D?
- Faulty fuel pump power control module
- Open or short circuit in the fuel pump power control module wiring harness
- Poor electrical connection in the fuel pump power control module circuit
How to repair code P129D?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
What are the possible symptoms of code P129D?
- Check engine light on (or Service Engine Soon warning light)
What does code P129D 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 in the fuel pump power control module ignition switch circuit is below a calibrated value for 1 second.