P2668
Fuel Mode Indicator Lamp Control Circuit
The fuel mode indicator lamp circuit (showing whether a bi-fuel vehicle currently runs on gasoline or alternative fuel) is faulty. Driver may not know the active fuel.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Burnt-out indicator bulbCommon
- Open or shorted wire to the clusterPossible
Parts involved
- Fuel Mode Lamp
- Instrument Cluster
- Wiring Harness
P2668 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.