Code Definition

P047F — Exhaust pressure control valve stuck open

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P047F

P047F is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P047F is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P047F is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P047F is set when the Engine Control Module (ECM) detects that the exhaust pressure control valve is stuck in the open position. This valve, typically part of the vehicle's exhaust gas recirculation (EGR) or turbocharger system, plays a key role in controlling exhaust flow and pressure. When stuck open, it can adversely affect engine performance, emissions, and overall efficiency. The ECM identifies this condition through sensors that monitor the expected versus actual exhaust flow and pressure.

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