Timing Reference High Resolution Signal A Malfunction
The P0370 code indicates a problem with the high-resolution timing reference signal from the crankshaft position sensor (or camshaft position sensor) to the PCM. This signal is critical for engine timing, fuel injection, and ignition control. A malfunction can cause the PCM to lose synchronization, leading to poor engine performance or no-start conditions.
1. Most Common Causes
- Faulty crankshaft position sensor
- Wiring or connector issues in the sensor circuit
- Damaged reluctor ring or tone wheel
- PCM failure (rare)
2. Symptoms You Will Notice
- Engine cranks but does not start
- Rough idle or stalling
- Check Engine Light illuminated
- Poor acceleration or hesitation
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and verify P0370 is present.
Step 2: Inspect the crankshaft position sensor connector and wiring for damage or corrosion.
Step 3: Test the sensor's resistance and AC voltage output while cranking the engine.
Step 4: Check the reluctor ring for damage or debris.
Step 5: If all else fails, replace the crankshaft position sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may stall or fail to start, leading to a dangerous situation. Have it diagnosed and repaired immediately.
How much does it cost to fix?▼
Typically $50-$150 for a new crankshaft position sensor plus labor, which can range from $100-$200 depending on the vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.