Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect for the conditions listed below:
- A tire or wheel that is out of round or out of balance
- Variable thickness brake rotors
- An unbalanced drive shaft
- Certain rough road conditions
- Transmission operation
- A damaged or defective accessory drive component or belt
- High resistance in the circuits of the injectors or ignition coils may set a misfire DTC without setting an injector or ignition coil DTC. Test the injector and ignition coil circuits of the affected cylinder(s) for a high resistance if you suspect a condition. Also check for poor terminal tension at the injectors and ignition coils of the affected cylinder(s).
- If the condition is intermittent, wiggle the related wiring harnesses and connectors, with the ignition/vehicle on or engine running, while monitoring the scan tool circuit status parameters for the component. The parameters will display if there is a condition with the circuit or a connection.
- A condition in the heated O2 sensor (HO2S) heater control circuits may set a DTC P0300.