The P0371 code indicates that the engine control module (ECM) has detected more pulses than expected from the high-resolution timing reference sensor. This suggests a discrepancy between the actual crankshaft or camshaft rotation and the signal being reported to the computer.
The sensor may have internal electrical failure or contamination, leading to erratic signal pulses.
A bent, loose, or fouled tone ring/reluctor wheel can create extra pulses as it passes the sensor.
A stretched timing chain or a jumped belt can cause mechanical misalignment, altering the pulse timing.
Frayed wires or poor shielding can introduce electromagnetic noise, which the ECM interprets as extra pulses.
A failure in the signal processing circuit of the engine control module, though this is rare.
No, P0371 is related to the timing reference signal from the crankshaft or camshaft, not the combustion process or ignition system.
It can be both; while it often manifests as a sensor failure (electrical), it can also be caused by a stretched timing chain or damaged reluctor wheel (mechanical).
No. While the PCM is listed as a potential cause, it is rarely the source of P0371. Most cases are resolved by addressing sensor, wiring, or mechanical timing issues.