Timing Reference High Resolution Signal A Malfunction
The P0370 code indicates a problem with the high-resolution timing reference signal 'A' from the crankshaft position sensor or related circuitry. This signal is critical for engine timing and fuel injection synchronization. A malfunction can cause erratic engine behavior, misfires, or no-start conditions.
01. Most Common Causes
- Faulty crankshaft position sensor
- Wiring or connector issues in the sensor circuit
- Damaged reluctor ring or tone wheel
- ECU failure (rare)
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Hard starting or no-start
- Check Engine Light illuminated
- Reduced engine power or stalling
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Inspect crankshaft position sensor wiring and connector for damage or corrosion.
Step 3: Test sensor resistance and AC voltage output while cranking.
Step 4: Check reluctor ring for damage or debris.
Step 5: If all else fails, replace the crankshaft position sensor.
04. Commonly Affected Makes
05. 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 potential accident.
How much does it cost to fix?▼
Typically $50-$150 for a sensor replacement, but diagnostic fees may add $50-$100.