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
Related codes
- P0370Timing Reference High Resolution Signal A
- P0378Timing Reference High Resolution Signal B Intermittent/Erratic Pulses
- P0371Timing Reference High Resolution Signal A Too Many Pulses
- P0372Timing Reference High Resolution Signal A Too Few Pulses
- P0374Timing Reference High Resolution Signal A No Pulses
- P0375Timing Reference High Resolution Signal B
- P0376Timing Reference High Resolution Signal B Too Many Pulses
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.