What P0335 Means
The crankshaft position sensor, which tells the engine control module exactly where the crankshaft is so it can time fuel injection and ignition, isn't sending a usable signal.
Common Causes
- Faulty crankshaft position sensor
- Damaged or corroded wiring/connector
- Debris or metal shavings on the sensor tip
- Damaged sensor reluctor ring/tone wheel
Symptoms You Might Notice
- Engine may crank but not start
- Stalling while driving, sometimes intermittently
- Rough running or misfire-like symptoms
- Check engine light on
What to Check First
- 1
Inspect the sensor's wiring and connector for damage or corrosion
- 2
Check the sensor tip for metal debris and clean if needed
- 3
Test the sensor's signal output with an oscilloscope or scan tool if available
- 4
Replace the sensor if it's not producing a consistent signal — this is a common cause of intermittent no-start or stalling issues
Frequently Asked Questions
My car sometimes won't start, then works fine later — could this be the cause?
Yes, an intermittent crankshaft position sensor fault is one of the classic causes of unpredictable no-start or random stalling issues, since the engine can't time ignition without a reliable signal.