P1365 Code Description
When diagnostic code P1365 is triggered, it indicates a problem with the ignition coil secondary circuit. The ignition coil is responsible for converting the battery’s low voltage into the high voltage needed to ignite the fuel in the engine cylinders. A failure in the secondary circuit can lead to misfires, rough idling, reduced fuel efficiency, and potentially even engine stalling. Ignoring this issue can damage other components of the ignition system and lead to more serious problems later. The underlying cause of this code may be a faulty ignition coil, damaged wiring, or issues with the spark plugs or ignition system.
Common Causes of P1365
NOTE: The listed causes may not be a complete list of all potential problems, and there may be other causes.
- Faulty ignition coil
- Damaged wiring in the ignition system
- Worn spark plugs
- Issues with ignition system components
- Electrical problems in the vehicle
Symptoms of P1365
- Engine misfires
- Rough idling
- Decreased fuel efficiency
- Engine stalling
- Illuminated check engine light
How to Fix P1365
- Diagnose the specific cause of the issue using a diagnostic scanner to locate the problem in the ignition coil secondary circuit.
- Replace the faulty ignition coil if it is identified as the cause of the problem.
- Check and repair any damaged wiring or connections in the ignition system.
- Inspect and replace any worn spark plugs.
- Test the ignition system to ensure proper operation and clear the diagnostic code from the vehicle’s computer.