P0373 Code: Timing Reference Signal A Intermittent Pulses
🟠 Moderate severity · drivable
Drivable, but the engine may run rough or stall, so get it checked soon.
What P0373 means
The high-resolution timing signal is coming through in an uneven, jerky pattern instead of a steady series of pulses. An erratic pulse signal often points to a loose connector, damaged wiring, or a worn signal wheel. The computer can't set spark timing reliably until it's fixed.
Symptoms
- Check engine light is on
- Rough running or misfire
- Hard starting
- Engine stalling
Common causes
- most common: Loose or damaged wiring at the connector
- common: Faulty crankshaft position sensor
- common: Damaged reluctor wheel
- less common: Sensor gap issue
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect and clean the sensor connector and wiring | Yes | $0–10 |
| Replace the crankshaft position sensor | Yes | $50–200 |
| Inspect the reluctor wheel for damage | Mechanic | $100–300 |
Frequently asked questions
Can I drive with a P0373 code?
Yes, but the engine may run rough or stall. Get it checked soon.
What is the most common cause of P0373?
Loose or damaged wiring at the sensor connector.
How much does it cost to fix a P0373?
Often just a connector cleanup; a new sensor runs about $50–$200.
Related codes
P0370
P0370 Code: Timing Reference High Resolution Signal A Malfunction
P0372P0372 Code: Timing Reference Signal A Too Few Pulses
P0339P0339 Code: Crankshaft Position Sensor A Circuit Intermittent
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.