OBD-II code · Powertrain (generic)

P0373 Timing Reference High Resolution Signal A Intermittent/Erratic Pulses

Timing reference signal A pulses are erratic — connector or wiring intermittent, contamination on tone wheel, or sensor partially failed.

Is it safe to drive with P0373?

Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.

Common causes

  • Most likelyIntermittent connector or contamination
  • Less likelyConnector with intermittent contact under vibration
  • Less likelyHarness routed against vibrating component

Repair at a glance

Difficulty
Medium
DIY friendly
Often, with basic tools
Typical labour
0.5–2.5 h
Emissions test
Likely to fail
Parts involved
Crankshaft Position Sensor

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.