P0371: Timing Reference High Resolution Signal A Too Many Pulses
The PCM has detected an excessive number of pulses from the high-resolution crankshaft position sensor (signal A) compared to the expected pattern. This indicates a fault in the sensor circuit, a damaged reluctor ring, or electrical interference, causing incorrect timing reference for fuel injection and ignition.
01. Most Common Causes
- Faulty crankshaft position sensor
- Damaged or missing reluctor ring teeth
- Wiring or connector issues (shorts, opens, corrosion)
- Electrical noise from alternator or ignition system
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Hard starting or no start
- Check Engine Light illuminated
- Reduced fuel economy and performance
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the crankshaft sensor wiring and connector for damage.
Step 3: Test sensor resistance and AC voltage output while cranking.
Step 4: Inspect the reluctor ring for damage or debris.
Step 5: Check for electrical interference from nearby components.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with P0371 can cause stalling, poor performance, and potential engine damage. It's best to diagnose and repair immediately.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, but costs may increase if wiring repairs or reluctor ring replacement is needed.