Error code

OBD2 P0312

OBD2P0312
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Cylinder 12 Misfire Detected.

Severity

moderateCan be driven but performance will suffer and it may cause further engine damage if not addressed.

Summary

P0312 indicates that cylinder number 12 in your engine is misfiring, meaning it's not igniting properly during combustion.

Symptoms

  • Vibrations at idle
  • Decreased engine performance and fuel economy

Common Causes

  • Faulty spark plug in cylinder 12
  • Defective ignition coil for cylinder 12
  • Wiring issues related to cylinder 12
  • Malfunctioning fuel injector for cylinder 12

Diagnosis

  1. Check the spark plug, ignition coil, wiring, and fuel injector for cylinder 12.
  2. Swap components between cylinders to identify faulty parts.
  3. Inspect for compression issues such as exhaust valve or head gasket leaks.

Fixes

  • Replace faulty spark plug, ignition coil, wiring, or fuel injector in cylinder 12.

FAQ

What should I do if my car has a P0312 code?

You should diagnose the issue by checking components specific to cylinder 12 and possibly swapping parts with other cylinders. If symptoms persist, further inspection for compression issues is necessary.

View source

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

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