P0371
UniversalTiming Reference High Resolution Signal A Too Many Pulses
High SeverityThis code signifies that the Powertrain Control Module (PCM) is receiving an excessively high number of pulses from the Crankshaft Position Sensor or Camshaft Position Sensor, indicating an inaccurate engine timing signal. This can lead to severe engine performance issues, including misfires, stalling, or a no-start condition.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is on level ground and the parking brake is engaged. Disconnect the battery before performing any electrical work or replacing sensors to prevent accidental shorts or injury. Allow the engine to cool down if working near hot components.
Common Symptoms
- Check Engine Light illuminated
- Engine misfires or rough idling
- Engine stalling
- Difficulty starting or no-start condition
- Reduced engine performance
Common Causes
- Faulty Crankshaft Position Sensor or Camshaft Position Sensor
- Damaged or frayed wiring/connector to the sensor
- Incorrect sensor installation or loose mounting
- Debris on the sensor or target wheel
- Rarely, an issue with the Powertrain Control Module (PCM)
Frequently reported on: General/Universal
Diagnostic Steps
- Inspect the Crankshaft Position Sensor and its wiring harness for any visible damage, corrosion, or loose connections.
- Check for any metallic debris stuck to the sensor tip that might be interfering with its reading.
- If accessible, carefully remove and clean the sensor, and inspect the target wheel for damage.
- Using a multimeter, test the sensor's resistance and voltage output according to manufacturer specifications (this may require a diagnostic tool for live data).
- If the sensor is suspected to be faulty, replace it with a new, high-quality OEM equivalent part.
- After replacement, clear the code and perform a test drive to ensure the issue is resolved.
👨🔧 When to Call a Professional
If the engine fails to start, repeatedly stalls, or if visual inspection and basic troubleshooting do not reveal an obvious cause, it is best to consult a professional mechanic. Complex diagnostics with specialized tools may be required to pinpoint the exact issue.
Commonly Asked Questions
What does "Too Many Pulses" mean for my engine?
It means the engine's computer is receiving more signal pulses than expected from a timing sensor, indicating an incorrect or corrupted signal which can throw off engine timing.
Can I drive my car with a P0371 code?
Driving with this code is not recommended as it indicates a critical engine timing issue that can cause severe misfires, stalling, or potential engine damage if left unaddressed.
Is the Crankshaft Position Sensor always the problem with P0371?
While the Crankshaft Position Sensor is a common culprit, the issue could also be with the Camshaft Position Sensor, wiring, the sensor's reluctor ring, or rarely, the PCM itself.
How difficult is it to replace a Crankshaft Position Sensor?
The difficulty can vary from medium to advanced depending on the sensor's location on your specific vehicle. Some are easily accessible, while others require removing other components.
What tools do I need to diagnose P0371?
Basic hand tools, a multimeter, and an OBD-II scanner are helpful. For more precise diagnostics, a digital oscilloscope or advanced scan tool for live data might be necessary.