What are the possible causes of the Audi P12A4 code?
- Faulty fuel rail pump control valve
- Fuel pump control valve wiring harness is open or short-circuited
- Poor electrical connection in the fuel rail pump control valve circuit
How to repair the Audi P12A4 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 Audi P12A4 code?
- Check engine light on (or Service Engine Soon warning light)
What does the Audi P12A4 code mean?
The Engine Control Module (ECM) monitors the fuel rail pump control valve. The ECM sets the OBDII code when the fuel rail pump control valve does not meet factory specifications.