P2149
Fuel Injector Group B Supply Voltage Circuit/Open
The ECU detects an open or missing supply voltage on injector group B. The injectors on this bank cannot be energized, leading to misfire on the affected cylinders.
- 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.
- Blown injector group B fuseCommon
- Faulty injector supply relayPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Fuel Injector
- Injector Supply Relay
- Injector Wiring
P2149 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.