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OBD II Fault Code

  • OBD II P04A7

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Exhaust Pressure Control Valve "B" Position Sensor/Switch Circuit

The Exhaust Pressure Control Valve controls exhaust back pressure during engine warmup. If the engine control module (PCM) determines there is an incorrect signal from the Exhaust Pressure Control Valve, the PCM will set code P04A7.

Common Problems That Trigger the P04A7 Code

  • Exhaust pressure control valve failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue
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