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P0371

Timing Reference High Resolution Signal A Too Many Pulses

Timing reference signal A delivers more pulses per crank revolution than expected — typically electrical noise, missing reluctor gap, or wrong tone wheel.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: hard

Common causes

Ordered by how often each turns out to be the cause.

  • Wrong tone wheel or electrical noiseCommon

Parts involved

  • Crankshaft Position Sensor
  • Flywheel

P0371 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.