OBD codes / P0312
P0312
SeriousCylinder 12 Misfire Detected
Address promptly — can worsen or affect drivability.
Likely causes
- worn spark plug or ignition coil
- clogged or leaking fuel injector
- low compression on that cylinder
Common fixes
- replace the cylinder 12 spark plug and coil
- test the injector; compression test if it persists
Seeing P0312 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0312 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.