P1374 Code Description
The P1374 code refers to a fault in the 3X reference circuit of the vehicle’s Engine Control Module (ECM). The 3X reference circuit is responsible for providing the ECM with a signal that represents the crankshaft position. This information is crucial for the ECM to accurately control ignition timing and fuel injection timing. When this circuit malfunctions, it can lead to significant performance issues in the vehicle.
Common Causes of P1374
NOTE: The listed causes may not be a complete list of all potential issues, and there may be other causes.
- Wiring harness issues
- Faulty crankshaft position sensor
- Faulty ECM
- Circuit malfunction
Symptoms of P1374
- Engine misfires
- Rough or irregular idle
- Stumbling
- Reduced engine power
- Difficulty starting the vehicle
How to Fix P1374
- Diagnose the issue using a diagnostic scanner to retrieve error codes and data related to the 3X reference circuit.
- Inspect the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring if necessary.
- Check the crankshaft position sensor for proper operation. Replace it if necessary.
- Check the ECM for faults or malfunctions. Repair or replace the ECM if it is found to be defective.
- Clear the error codes from the ECM memory, reset the system, and test the vehicle to ensure the issue has been resolved.