P1370 Code Description GMC
The GMC P1370 diagnostic trouble code (DTC) refers to an excessive number of pulses in the ignition control module’s 4X reference circuit. This code indicates that the engine control module (ECM) has detected a problem with the signal from the ignition control module (ICM) related to the 4X reference circuit. The 4X reference circuit is responsible for providing the ECM with information about the crankshaft and camshaft position. When too many pulses are detected in this circuit, it can lead to timing issues and affect the overall performance of the engine.
Common Causes of GMC P1370
NOTE: The listed causes may not be a complete list of all potential issues, and there may be other causes.
- Faulty ignition control module
- Wiring issues in the 4X reference circuit
- ECM malfunction
- Poor electrical connection
- Engine overheating
Symptoms of GMC P1370
- Engine misfires
- Rough idling
- Poor acceleration
- Stalling
- Check Engine light is on
How to Fix GMC P1370 Code
- Diagnose the code using a scan tool to identify the exact cause of the issue.
- Inspect the ignition control module and the 4X reference circuit wiring for any signs of damage or corrosion.
- Test the ECM to ensure it is functioning properly.
- Replace the ignition control module if it is found to be faulty.
- Clear the DTC and perform a road test to verify that the issue has been resolved.