P0373: Timing Reference High Resolution Signal A Intermittent or Erratic Pulses
Do not keep driving
Expect intermittent power loss and roughness that comes and goes with load. Report the conditions under which it happens.
What this code means
The pulse train is unstable rather than consistently wrong. Erratic high-resolution signals are commonly mechanical in origin — a reluctor with runout, or a sensor whose mounting has loosened enough to let the air gap vary as the engine flexes under load.
Likely causes
Start here
- Intermittent wiring fault · moderate
- Incorrect sensor air gap · moderate
- Damaged reluctor or tone ring · specialist
- Corroded or loose connector · easy
Less common
- Damaged sensor cable shielding · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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- The car — make, model, year and engine. The same fault behaves differently on each.
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