Error code

OBD2 P0321

OBD2P0321
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Ignition/Distributor Engine Speed Input Circuit Range/Performance.

Severity

highThe vehicle may be drivable but performance issues are likely.

Summary

P0321 indicates an issue with the crankshaft position (CKP) sensor or engine speed (RPM) sensor, which provides critical data to the PCM for ignition timing and fuel delivery. This sensor is typically located near the front of the engine on the crankshaft.

Symptoms

  • Engine misfires
  • Poor acceleration
  • Stalling

Common Causes

  • Defective CKP/RPM sensor
  • Damaged or corroded wiring and connectors in the CPS control/signal circuit
  • Clogged teeth on the reluctor ring
  • Defective reluctor ring

Diagnosis

  1. Check for other related codes, especially those indicating misfires or air leaks.
  2. Inspect the CKP/RPM sensor and its wiring for damage or corrosion.
  3. Verify that the reluctor ring is clean and undamaged.

Fixes

  • Replace the defective CKP/RPM sensor

FAQ

Can I drive with P0321?

The vehicle may be drivable but performance issues such as stalling or misfires are likely.

What causes P0321?

Common causes include a faulty CKP/RPM sensor, damaged wiring and connectors, clogged reluctor ring teeth, or a defective reluctor ring.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

More OBD2 codes

All OBD2 codes →Search more codes →