What does code P04A0 mean?

Q: What does code P04A0 mean?

Exhaust Pressure Control Valve B Range/Performance. P04A0 is a generic powertrain code indicating that the powertrain control module (PCM) has detected a range or performance problem with the exhaust pressure control valve circuit for bank B. The PCM monitors the valve's response to commanded changes and sets this code when the actual pressure or valve position does not match the expected values within a calibrated time window.

DTC codes / P04xx · Auxiliary emission controls / P04A0

P04A0Exhaust Pressure Control Valve B Range/Performance

P04A0 is a generic powertrain code indicating that the powertrain control module (PCM) has detected a range or performance problem with the exhaust pressure control valve circuit for bank B. The PCM monitors the valve's response to commanded changes and sets this code when the actual pressure or valve position does not match the expected values within a calibrated time window.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.