Code Definition

P047C — Exhaust pressure sensor signal low sensor 2

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

About P047C

P047C 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 P047C is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

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 P047C 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 P047C is set when the Engine Control Module (ECM) detects a low signal from the second exhaust pressure sensor. This condition suggests that the sensor's output is below the expected threshold, indicating potential issues with the sensor or associated circuitry. The exhaust pressure sensor 2 is critical for accurately measuring the exhaust back pressure, which the ECM uses to optimise engine performance, control emissions, and detect malfunctions in the exhaust system.

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