P0337
Crankshaft Position Sensor "A" Circuit Low Input
The CKP signal voltage is below the lower threshold. Usually a sensor whose internal coil has degraded, or a wiring short to ground.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Sensor failed (output too low)Common
- Signal shorted to groundPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Crankshaft Position Sensor
- Crankshaft Position Sensor Wiring
P0337 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.