P1373 Code Description
The P1373 diagnostic trouble code (DTC) refers to an early activation fault in the ignition coil of cylinder 3. This code indicates there is a problem with the ignition timing of cylinder 3’s ignition coil, which can lead to misfires, poor engine performance, and potentially even engine damage if not resolved. The ignition coil is responsible for converting the battery’s low voltage supply into high voltage supply to ignite the air-fuel mixture in the engine’s combustion chamber. When the ignition coil of cylinder 3 activates too early, it can disrupt the timing of the combustion process, resulting in power loss, rough idling, and increased fuel consumption.
Common Causes of P1373
NOTE: The listed causes may not be a complete list of all potential issues, and there may be other causes.
- Faulty ignition coil
- Wiring or connection issues
- Malfunctioning engine control module (ECM)
- Spark plug problems
- Mechanical issue in cylinder 3
Symptoms of P1373
- Rough idling
- Loss of power
- Engine misfires
- Increased fuel consumption
- Engine stalling
How to Fix P1373
- Diagnose the issue using a scan tool to confirm the P1373 code and identify the specific problem with the ignition coil in cylinder 3.
- Inspect the ignition coil, wiring, and connections for any damage or corrosion. Replace any faulty components.
- Check and replace the spark plug in cylinder 3 if necessary.
- Test the ignition coil using a multimeter to ensure it is functioning properly.
- Clear the code and test the vehicle to confirm the issue has been resolved.