What are the possible causes of code P12A9?
- Faulty boost pressure sensor
- Boost pressure sensor harness is open or short-circuited
- Poor electrical connection in the boost pressure sensor circuit
How to repair code P12A9?
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 code P12A9?
- Engine light on (or Service Engine Soon warning light)
What does code P12A9 mean?
During the control module shutdown phase, the diagnostic function monitors the barometric pressure sensor, intake manifold pressure sensor, and boost pressure sensor to determine if they all measure the same
pressure. The ECM sets the OBDII code when the boost pressure sensor does not meet factory specifications.