P0372 critical

Timing Reference High Resolution Signal A Intermittent

The P0372 code means the vehicle's onboard diagnostic system has detected: Timing Reference High Resolution Signal A Intermittent. This is a critical severity code.

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Keep driving?
No -- stop driving
DIY difficulty
hard
Estimated cost
$100 - $600 (parts and labor)
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Common Symptoms

  • Engine stalls intermittently
  • Check Engine Light on
  • Engine hesitates or stumbles randomly
  • Random no-start conditions

Probable Causes (Ranked by Likelihood)

  • Crankshaft position sensor failing intermittently Very High
  • Loose or corroded crank sensor connector High
  • Intermittent wire break in sensor circuit Moderate
  • Reluctor wheel loosening on crankshaft Low

Step-by-Step Diagnostic Procedure

  1. Monitor crank sensor signal on scan tool while engine is running. Watch for momentary dropouts.

  2. Wiggle test: tap and wiggle the sensor and connector while engine runs.

  3. Inspect connector pins for corrosion or loose fit.

  4. Check sensor mounting torque and inspect for oil contamination.

Frequently Asked Questions

Why does my car stall randomly?

An intermittent crank sensor signal causes the PCM to momentarily lose track of engine position, which can stall the engine.

Can heat cause intermittent crank sensor failures?

Yes, crank sensors can fail when hot and work when cold. This is called heat soak failure and is a common failure mode.

How do I catch an intermittent crank sensor fault?

Drive with a scan tool connected and monitor the RPM signal. An intermittent sensor will show momentary RPM dropouts to zero.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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