P262D
Sensor Reference Voltage G Circuit Low
The 5 V reference G voltage is below the expected level. Usually a short to ground or excessive load from a downstream sensor pulling the rail down.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Reference wire shorted to groundCommon
- Sensor on the rail shorted internally to groundPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Control Module
- Reference Voltage Rail
- Sensors On Rail G
P262D 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.