P250C
Engine Oil Level Sensor Circuit Low
The oil level sensor signal voltage reads below the lower limit, typically a short to ground or an open at the reference end of the sender. The ECM treats the input as invalid and ignores oil-low warnings until the circuit is repaired.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to groundCommon
- Sender shorted internallyPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Oil Level Sensor
- Sensor Wiring
P250C 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.