P02E4 OBD II Trouble Code Diesel Intake Air Flow Control Stuck Open

How to easily diagnose, repair, and causes of a P02E4 diesel code which indicates a detected stuck open intake air flow control system in a diesel engine vehicle.

Symptoms of P02E4 OBD II Trouble Code

  • Malfunction Indicator Light On
  • Possible low idle speed only
  • Flashing Electronic Throttle Control symbol
  • No Regeneration of the diesel particulate filter to burn off the soot build up (won?t burn off soot out of the DPF catalyst) ? eventual loss of power complain

Common Causes of P02E4 OBD II Trouble Code

  • Open in the signal circuit to the DIAFCS motor/control ? possible
  • Short to voltage in the signal circuit to the DIAFCS motor/control - possible
  • Short to ground in the signal circuit to the DIAFCS motor/control ? possible
  • Failed DIAFCS motor/control ? likely
  • Failed PCM - unlikely

Severity of P02E4 OBD II Trouble Code

Severity in all cases will be not severe. If mechanical issues are the cause, the typical failure is low idle speed. If it is an electrical failure, the PCM can compensate adequately for them.