What are the possible causes of code P129E?
- 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 repair code P129E?
Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
What are the possible symptoms of code P129E?
- Check engine light on (or Service Engine Soon warning light)
What does code P129E mean?
The fuel pump power control module continuously sends serial data messages to the engine control module (ECM) regarding the operating status of the fuel pump power control system. These messages are sent in a series of continuous repeated counts with associated password-protected samples, and each count/sample is assigned a value. When the ECM determines that too many counts/samples contain an error value, the ECM sets the diagnostic trouble code (DTC) P129E.