P04A8 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P04A8 – Exhaust Pressure Control Valve ‘B’ Position Sensor/Switch Circuit Low

 

P04A8 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P04A8 Possible Causes

 

Faulty Exhaust Pressure Control Valve ‘B’ Position Sensor/Switch,Exhaust Pressure Control Valve ‘B’ Position Sensor/Switch harness is open or shorted,Exhaust Pressure Control Valve ‘B’ Position Sensor/Switch circuit poor electrical connection

 

P04A8 Description

 

The Powertrain Control Module (PCM) monitors the Exhaust Pressure Control Valve Position Sensor. The PCM sets the OBDII code when the Exhaust Pressure Control Valve Position Sensor is not to factory specifications.