P065D OBD II Trouble Code Reductant System Malfunction Lamp Control Circuit

How to easily diagnose, repair, and info on causes of a P065D trouble code that indicates a detected failure of the reductant system malfunction lamp control circuit.

Symptoms of P065D OBD II Trouble Code

  • Inoperative reductant system
  • Reductant system malfunction lamp is inoperative
  • Reductant system malfunction lamp remains illuminated
  • Engine drivability issues
  • Catalytic converter codes

Common Causes of P065D OBD II Trouble Code

  • Defective reductant system malfunction lamp bulb
  • Open or shorted circuit between the PCM and the instrument panel or other controllers
  • PCM programming error
  • Faulty controller or PCM

Severity of P065D OBD II Trouble Code

A P065D should be categorized as severe because it could result in an inoperative reductant system, catalytic converter damage, and/or drivability issues.