OBD II Fault Code

  • OBD II P20E4

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Exhaust Gas Temperature Sensor 2/3 Correlation

The Exhaust Gas Temperature (EGT) Sensor tells the engine control module (PCM) the temperature of the exhaust gas going into and out of the Selective Catalytic Reduction (SCR). The vehicle uses multiple EGT sensors and compares them to each other to verify proper calibration. If the PCM detects an implausible signal from the EGT sensor, it will store code P20E4.

Common Problems That Trigger the P20E4 Code

  • Exhaust Gas Temperature (EGT) sensor failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue
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