P2149: Fuel Injector Group B Supply Voltage Circuit/Open
Do not keep driving
Expect a severe misfire, or no running at all if both groups are affected. If codes for two groups are stored together, ask for the module's power and ground to be checked first — two supplies failing at once usually means the thing that feeds both.
What this code means
A fault in the supply feeding the second group of injectors. The grouping argument is under P2146 and applies unchanged.
What two groups faulting together adds is a strong pointer. Groups A and B are separate supplies precisely so that one failing leaves the engine running on the other — the arrangement exists to degrade rather than stop. So both failing at once is unlikely to be two coincidental supply faults, and points instead at what they share: the module that generates both rails, its power feed, or its ground. The corpus makes that case at length under P0882, and an engine that will not run at all with both group codes stored is the clearest version of it.
Likely causes
Start here
- Faulty fuel injector control module · specialist
- Short circuit in a fuel injector · moderate
- Damaged injector wiring harness · moderate
Less common
- Poor module ground connection · moderate
- Low system voltage · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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