P0337
Crankshaft Position Sensor A Circuit Low
Crank/cam position
Generic OBD-II
High
What it means
P0337 means the crankshaft position sensor "A" circuit is reading abnormally low voltage. The PCM relies on this sensor to track engine speed and piston position for spark and fuel timing, so a fault here can cause hard starting, stalling, or a no-start — usually from wiring or the sensor itself.
High
Can I keep driving? Risky — a crank sensor fault can cause stalling or a no-start; be ready to be stranded and fix it promptly.
Common symptoms
What you'll notice
- Check-engine light on
- Hard starting, no-start, or stalling
- Intermittent cutting out while driving
- Rough idle or hesitation
Common causes
Most likely first
- Corroded, loose, or damaged connector at the crankshaft position sensorLikely
- Open or shorted (low) wiring in the sensor circuitCommon
- Faulty crankshaft position sensorCommon
- Damaged reluctor/tone ring or metal debris on the sensor tipLess often
- PCM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Inspect the crank sensor connector and harness for corrosion, chafing, or a short to ground.
- Check the sensor tip and reluctor ring for damage or debris.
- Back-probe the circuit and compare signal/voltage to spec while cranking.
- Replace the crankshaft position sensor if it is faulty, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0337?+
Not really — the crank signal is essential for spark and fuel timing, so the engine can stall or fail to start without warning.
Can I just clear P0337?+
It will return, and clearing it won't stop a stall. Repair the wiring or sensor first.
Related codes
Often seen with P0337
Read & clear P0337 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX