P0405 OBD II Trouble Code Exhaust Gas Recirculation Sensor A Circuit Low

Detailed information on troubleshooting and repairing a P0405 DTC code which has to do with the EGR Circuit Sensor A. Also includes links to relevant forum topics on the code.

Symptoms of P0405 OBD II Trouble Code

  • MIL (Malfunction Indicator Lamp) illumination

Common Causes of P0405 OBD II Trouble Code

  • Short to ground in EGR signal or Reference circuits
  • Short to voltage in EGR ground or signal circuits
  • Bad EGR valve
  • Bad PCM wiring issues due to chafing or loose terminals