Code Definition

P0371 — Timing Reference High Resolution Signal A Too Many Pulses

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0371

P0371 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0371 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0371 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The powertrain control module (PCM) sets this code when it detects an excessive number of pulses from the high-resolution timing reference signal 'A', which is typically generated by the crankshaft or camshaft position sensor. This may indicate a problem with the reluctor wheel, sensor misalignment, or electrical interference. An incorrect signal can disrupt ignition timing and fuel injection, leading to poor performance, misfires, or engine stalling.

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