P2150
Fuel Injector Group B Supply Voltage Circuit Low
The supply voltage feeding injector group B has dropped below the lower limit. The injectors in this group lose drive voltage and may stop firing, so the cylinders they serve run lean or cut out. Causes: a blown fuse, a failed injector supply relay, a voltage drop in the supply harness, or a poor ground or connector on the group-B supply.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
Common causes
Ordered by how often each turns out to be the cause.
- Fuse, relay, or wiring fault on supplyCommon
- Connector pins corroded - high contact resistanceLess likely
- Harness chafing through insulationLess likely
Parts involved
- Fuel Injector Group B
- Injector Supply Relay
P2150 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.