Code Definition

P047A — Exhaust pressure sensor signal error sensor 2

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

About P047A

P047A 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 P047A is stored, the module has detected 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 P047A 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 P047A is set when the Engine Control Module (ECM) detects an error in the signal from the second exhaust pressure sensor. This error could be due to the sensor signal being out of the expected range, inconsistent, or not aligning with other engine parameters. Exhaust pressure sensors are crucial in monitoring the pressure within the exhaust system, providing data that the ECM uses to optimise engine performance, control emissions, and diagnose potential issues in the exhaust system.

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