What are the possible causes of the Chevrolet P129B code?
- Faulty fuel pump driver module
- Open or short circuit in the fuel pump driver module harness
- Poor electrical connection in the fuel pump driver module circuit
How to repair the Chevrolet P129B 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 P129B code?
- Check Engine Light on (or Service Engine Soon warning light)
What does the Chevrolet P129B code mean?
The fuel pump power control module monitors the battery positive voltage circuit to ensure the voltage is within the normal operating range. The Diagnostic Trouble Code (DTC) will be set when the fuel pump power control module detects that the battery positive voltage is below 7 V for 1 second.