P04A2 OBD II Trouble Code Exhaust Pressure Control Valve B High
How to quickly diagnose, repair, and info on symptoms and causes of a P04A2 trouble code which is an abnormal high condition with the B exhaust pressure control valve.
Symptoms of P04A2 OBD II Trouble Code
- Malfunction Indicator Lamp (MIL) illuminated
- Lack of power
- Lack of engine braking
- Longer than normal cold engine warmup time
Common Causes of P04A2 OBD II Trouble Code
- Stuck Exhaust Back Pressure Valve
- Restricted exhaust
- Open in the ground circuit to the exhaust pressure sensor
- Open in the signal circuit between the exhaust pressure sensor and the PCM
- Short to voltage in the signal circuit to the exhaust pressure sensor
- Exhaust Pressure Sensor faulty ? internally shorted to voltage
- Plugged Exhaust Pressure Sensor sensing tube
- Possibly turbocharger overboost
- Possibly the PCM has failed (highly unlikely)