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P04A4
Exhaust Pressure Control Valve B Stuck Open
Generic · emissions
Data confidence
65%
The control module determined that the Exhaust Pressure Control Valve B did not change state as commanded and appears stuck.
TuningBot DTC Database · v4.37.14
P04A4 Exhaust Pressure Control Valve B Stuck Open
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P04A4 means
Related and nearby codes
How to read P04A4
P
Powertrain: engine, transmission and driveline systems.
0
Generic SAE-standard code: same meaning on every make.
4A4
Specific fault index within the subsystem.
Frequently asked questions about P04A4
What does P04A4 mean?
Exhaust Pressure Control Valve B Stuck Open. The control module determined that the Exhaust Pressure Control Valve B did not change state as commanded and appears stuck.
Is P04A4 generic or manufacturer-specific?
P04A4 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P04A4 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic