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Home / DTC / P0371 — Timing Reference High Resolution Signal A Too Many Pulses

P0371 — Timing Reference High Resolution Signal A Too Many Pulses

Detailed page for trouble code P0371.

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Code

P0371

Generic P — Powertrain

Timing Reference High Resolution Signal A Too Many Pulses

Brand: Generic
Type: P — Powertrain
Views: UK: 13 EN: 16 RU: 10
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Page language: EN

Causes

  • Damaged or contaminated timing tone/reluctor wheel (broken teeth, debris)
  • Faulty high-resolution timing sensor (Hall effect or VR)
  • Short, intermittent short to voltage, or wiring harness damage (chafing, corrosion)
  • Poor sensor grounding or power supply/ reference voltage issues
  • Connector corrosion, bent pins or poor mating
  • Aftermarket modifications to crank/cam reluctor or incorrect replacement wheel

Symptoms

  • Malfunction Indicator Lamp (MIL) illumination
  • Engine misfire, rough idle or intermittent stalling
  • Hard starting or no-start condition (if timing calculation fails)
  • Reduced engine performance and drivability issues
  • Irregular rpm, surging, or unexpected RPM spikes
  • Stored freeze frame and related cam/crank timing codes

What to check

  • Read and record freeze frame and all stored DTCs with a scan tool
  • Check for related codes (crank/cam sensor circuits, cam/crank correlation)
  • Visually inspect sensor, wiring harness, connectors and reluctor/tone wheel for damage, corrosion or debris
  • Compare live high-resolution timing signal on scan tool if available
  • Probe sensor output with an oscilloscope to view pulse count, amplitude and noise
  • Measure sensor supply/reference voltage and ground continuity

Signal parameters

  • Expected pulse count per engine revolution (varies by design; e.g., 60-2, 36-1 patterns — check vehicle spec)
  • Hall-effect: square pulses ~0–5V, clean transitions; VR (inductive): AC waveform amplitude depends on speed (tens to hundreds mV to several volts)
  • Pulse width and spacing uniformity across revolutions — extra pulses indicate jitter/noise
  • Rise/fall time should be sharp for Hall sensors; excessive ringing or multiple transitions indicates fault
  • Signal frequency proportional to engine speed; unexpected additional high-frequency pulses indicate interference or shorting

Diagnostic algorithm

  1. Confirm P0371 and note freeze frame (engine speed, temp, condition when code set).
  2. Inspect sensor A, reluctor/tone wheel and surrounding area for physical damage, metal debris, or aftermarket changes. Repair as needed.
  3. Visually inspect and wiggle wiring harness and connector while monitoring live data for intermittent changes. Repair chafed wires or corroded connectors.
  4. Measure sensor reference voltage and ground; verify proper supply to sensor with multimeter. Repair supply/ground faults.
  5. Use an oscilloscope at the sensor connector to capture raw waveform while cranking/idle. Look for extra pulses, bouncing, noise, or unexpected voltage spikes.
  6. If oscilloscope shows multiple pulses, remove sensor and re-scan while rotating reluctor manually (where safe/possible) to check for tone wheel defects or debris.
  7. Check air gap and sensor alignment to spec; replace sensor or correct gap if out of tolerance.
  8. If wiring and sensor appear good but pulses remain, isolate sensor circuit from PCM and repeat scope check to determine if PCM is source. Consider swapping known-good PCM or reprogramming if manufacturer procedures indicate.
  9. After repairs, clear codes and road test across the rpm range to confirm code does not return and timing behavior is normal.

Likely causes

  • Sensor producing multiple transitions due to internal failure or contamination
  • Wiring short to battery or ignition leading to extra pulses
  • Reluctor wheel teeth damaged or additional metallic debris passing sensor
  • Poor sensor air gap causing jittery or multiple transitions
  • Connector/pin intermittent contact producing spurious pulses

Fault status

⚠️ Status
PCM detected an excessive number of timing reference pulses from high-resolution sensor A (too many pulses), indicating spurious/extra signals affecting timing calculation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 Hours

Similar codes

P0370 P0335 P0336 P0340 P0341
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