P129C – Ambient Pressure Sensor Run On Pressure Implausible

P129C Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P129C Possible Causes

Faulty Ambient Pressure Sensor,Ambient Pressure Sensor harness is open or shorted,Ambient Pressure Sensor circuit poor electrical connection

P129C Description

The Engine Control Module (ECM) monitors the Ambient Pressure Sensor. The ECM sets the OBDII code when the Ambient Pressure Sensor is not to factory specifications.