P250D
Engine Oil Level Sensor Circuit High
The oil level sensor signal voltage reads above the upper limit, typically a short to reference voltage or an open signal return. Pegged at maximum, the ECM cannot distinguish full from invalid and disables the level monitor.
- 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 reference voltageCommon
- Open signal returnPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Oil Level Sensor
- Sensor Wiring
P250D 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.