P1377 Code Description
The diagnostic code P1377 indicates a problem with the camshaft reference pulse from the ignition control module (ICM) not matching the 4X reference pulse. The ICM is responsible for controlling ignition timing in the engine, and when these reference pulses don’t align properly, it can lead to misfires, poor engine performance, and potential damage to engine components. This can result in rough idling, hesitation during acceleration, decreased fuel efficiency, and ultimately, engine stalling.
Common Causes of P1377
NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.
- Faulty ignition control module
- Wiring issues or poor connections between the ICM and engine control module
- Malfunctioning camshaft position sensor
- Incorrect ignition timing
- Malfunctioning engine control module (ECM)
Symptoms of P1377
- Rough idling
- Hesitation during acceleration
- Decreased fuel efficiency
- Engine stalling
- Check Engine light illuminated
How to Fix P1377
- Diagnose the problem using a scan tool to check for P1377 code and perform a visual inspection of wiring and connections.
- Test the camshaft position sensor to ensure it’s functioning properly.
- Check ignition timing and adjust if necessary.
- Replace the ignition control module if found to be faulty.
- Clear the code from the ECM memory and road test the vehicle to ensure the problem has been resolved.