P0339 Code: Crankshaft Position Sensor A Circuit Intermittent
🟠 Moderate severity · drivable
Drivable with caution, but the engine may stall suddenly when the signal drops, so fix it soon.
What P0339 means
The crankshaft position sensor A is dropping its signal in and out. This sensor tells the computer where the crankshaft is so it can fire the spark and fuel at the right time. An intermittent signal often causes the engine to stall or die suddenly, then restart.
Symptoms
- Check engine light is on
- Engine stalls or dies suddenly
- Hard starting
- Rough running or misfire
Common causes
- most common: Loose or damaged wiring at the connector
- common: Faulty crankshaft position sensor
- less common: Damaged reluctor ring or flywheel teeth
- less common: Sensor gap too large
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 |
| Repair damaged sensor wiring | Mechanic | $50–200 |
Frequently asked questions
Can I drive with a P0339 code?
Yes, but the engine may stall suddenly. Get it fixed soon.
What is the most common cause of P0339?
Loose or damaged wiring at the crankshaft sensor connector.
How much does it cost to fix a P0339?
Often just a connector cleanup; a new sensor runs about $50–$200.
Related codes
P0335
P0335 Code: Crankshaft Position Sensor Circuit Malfunction
P0336P0336 Code: Crankshaft Position Sensor A Circuit Range/Performance
P0337P0337 Code: Crankshaft Position Sensor A Circuit Low Input
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.