GMC P1374 Code Description
The GMC P1374 code refers to a problem with the 3X reference circuit in the vehicle. This code indicates that there is an issue with the circuit responsible for providing a reference signal to the Engine Control Module (ECM). The 3X reference circuit plays a crucial role in engine operation by providing timing information to the ECM, which is essential for fuel injection and ignition timing.
Common Causes of GMC P1374 Syndrome
NOTE: The listed causes may not be a complete list of all potential problems, and there may be other causes.
- Faulty crankshaft position sensor
- Faulty camshaft position sensor
- Wiring harness issues
- ECM malfunction
- Poor electrical connection
Symptoms of GMC P1374
- Engine misfires
- Rough idle
- Decreased fuel efficiency
- Engine hesitation
- Check engine light illuminated
How to Fix GMC P1374 Code
- Start by using a diagnostic scanner to retrieve the error code and identify the specific cause of the problem.
- Inspect the crankshaft and camshaft position sensors for any signs of damage or wear. Replace any faulty sensors.
- Check that the wiring harness connected to the 3X reference circuit has no breaks, short circuits, or corrosion. Repair or replace as needed.
- Test the ECM to ensure it is functioning properly. If necessary, reprogram or replace the ECM.
- Clear the error code from the ECM memory and test the vehicle to confirm that the problem has been resolved.