• The fault code P0312 indicates that there is a misfiring issue in Cylinder 12

Possible Symptoms:

  • Engine misfires or runs rough, especially at idle or under load

  • Decreased engine performance or power

  • Poor fuel efficiency

  • Check Engine Light (CEL) illuminated

Possible Causes:

  • Faulty ignition coil in cylinder 12

  • Spark plug in cylinder 12 is worn, fouled, or damaged

  • Fuel injector in cylinder 12 is clogged or malfunctioning

  • Low compression in cylinder 12

  • Faulty engine control module (ECM)

Related Parts:

  • Crankshaft Position Sensor: The crankshaft position sensor monitors the position of the crankshaft to regulate fuel injection. Problems lead to engine misfire and engine stalling

Possible Solutions:

  • Test and replace the faulty ignition coil in cylinder 12, if necessary

  • Replace the spark plug in cylinder 12 if it is worn, fouled, or damaged

  • Clean or replace the fuel injector in cylinder 12 if it is clogged or malfunctioning

  • Perform a compression test to check for low compression in cylinder 12 and repair as needed

  • Test and replace the engine control module (ECM) if it is determined to be faulty