P1370 Code – Ignition Control Module 4X Reference Circuit, Too Many Pulses

Code P1370 Description

The diagnostic code P1370 indicates that the Ignition Control Module (ICM) has detected too many pulses on the 4X reference circuit. The 4X reference circuit is responsible for providing a signal to the ICM that allows the ignition system to synchronize with the engine rotation. When the ICM detects an abnormal number of pulses on this circuit, it can lead to ignition timing issues, misfires, and overall engine performance problems.

Common Causes of P1370

NOTE: The listed causes may not be a complete list of all potential issues, and there could be other causes.

1. Faulty wiring or connections in the 4X reference circuit
2. Faulty Ignition Control Module (ICM)
3. Issues with the crankshaft position sensor
4. Corrosion or damage to electrical components
5. Engine overheating causing sensor malfunction

Symptoms of P1370

1. Rough idling
2. Hesitation during acceleration
3. Decreased fuel efficiency
4. Engine stalling
5. Misfires

How to Fix P1370

1. Perform a thorough inspection of the 4X reference circuit, checking for loose connections or damaged wiring.
2. Test the Ignition Control Module (ICM) to determine if it is functioning properly.
3. Check the proper operation and alignment of the crankshaft position sensor.
4. Replace any faulty components, such as the ICM, sensor, or wiring harness.
5. Clear the diagnostic codes and perform a road test to ensure the issue has been resolved.