OBD-II code · Powertrain (generic)
P0312 Cylinder 12 Misfire Detected
Misfires concentrated on cylinder 12. A cylinder-specific code points away from shared causes (fuel pressure, MAF) toward components dedicated to that cylinder — coil, spark plug, injector, compression.
Is it safe to drive with P0312?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIgnition coil failed
Symptoms
- Check engine light on or flashing
- Rough idle and uneven running
- Power loss, hesitation under acceleration
- Increased fuel consumption
- Possible smell of unburned fuel from exhaust
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Ignition Coil, Spark Plug
Related codes
- P0300Random/Multiple Cylinder Misfire Detected
- P0301Cylinder 1 Misfire Detected
- P0302Cylinder 2 Misfire Detected
- P0303Cylinder 3 Misfire Detected
- P0304Cylinder 4 Misfire Detected
- P0305Cylinder 5 Misfire Detected
- P0306Cylinder 6 Misfire Detected
- P0307Cylinder 7 Misfire Detected
- P0308Cylinder 8 Misfire Detected
- P0309Cylinder 9 Misfire Detected
- P0310Cylinder 10 Misfire Detected
- P0311Cylinder 11 Misfire Detected
- P030FIgnition B Control Signal Circuit High
- P0313Misfire Detected with Low Fuel
- P0314Single Cylinder Misfire — Cylinder Not Specified
- P0315Crankshaft Position System Variation Not Learned
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.