P0321 OBD II Trouble Code Ignition/Distributor Engine Speed Input Circuit Range / Performance

Symptoms of P0321 OBD II Trouble Code

  • Malfunction Indicator Light On
  • Engine cranks but will not start
  • Misfire, Hesitation, Stumble, Lack of Power

Common Causes of P0321 OBD II Trouble Code

  • Open in the control circuit (ground circuit) between the ignition/distributor/engine speed sensor and the PCM
  • Open in the power supply circuit between the ignition/distributor/engine speed sensor and the PCM
  • Short to ground in the power supply circuit to the ignition/distributor/engine speed sensor
  • Ignition/distributor/engine speed sensor faulty
  • Possibly a PCM has failed (highly unlikely)