P0370 Fault Code

Timing Reference High Resolution Signal A Malfunction

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0370 fault code indicates a malfunction in the timing reference high resolution signal A. This signal is crucial for the proper synchronization of the engine's timing processes. When this fault is logged, it suggests that the vehicle's Engine Control Module (ECM) is unable to detect the timing signals accurately, which may lead to engine performance issues or operational irregularities.

What are the symptoms of the P0370 code?

If the P0370 code is active, you may experience:

• Engine misfires or stalling.
• Reduced engine performance and efficiency.
• Difficulty starting the engine, particularly in colder conditions.
• Illumination of the check engine light on the dashboard.

What causes the P0370 code?

Several factors can contribute to the P0370 code being triggered:

• Damaged or corroded wiring in the timing signal circuit.
• Faulty crankshaft or camshaft position sensors that provide timing data to the ECM.
• Poor connection at the sensor or ECM connectors due to dirt, moisture, or physical damage.
• Malfunctioning ECM may fail to interpret the signals accurately.

How to fix P0370?

To resolve the P0370 fault code, follow these steps:

• Inspect the wiring and connectors related to the crankshaft and camshaft position sensors for damage or corrosion.
• Test the crankshaft and camshaft position sensors to ensure they are functioning properly.
• Clear the fault code from the ECM and perform a road test to confirm the issue is resolved.
• If the problem persists and no hardware issues are found, consider reprogramming or replacing the ECM.