P2149Fuel Injector Group B Supply Voltage Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2149 is the open or general fault of the second shared injector supply. Group membership depends on the engine: GM's 2009 Duramax places injectors 7 and 6 in group 2 (6 ms, type A), whereas GM's 2018 tables pair injectors 2 and 5 in the V8 – so the cylinders must be looked up for each engine. VW's 2014 TSI and VR6 engines use the same current window as for group A, under 2.6 A or above about 14.7–14.9 A. GM petrol direct injection treats P2149 as the high-side control line of cylinder 2: on the 2023–24 Corvette LT6 bulletin 24-NA-106 traces it, with rail pressure codes, to water entering a wrong 12-way connector on bank 2. A Mercedes M254 bulletin lists P2149 among faults caused by fuel boiling in the low-pressure system.
- What you may notice
- Misfire on the cylinders of group B
- Rough running and reduced power
- Check engine lamp on
- Likely causes
- LikelyInjector harness damaged or wire open
- PossibleWater entering an injector harness connector
- PossibleOpen coil or piezo stack in an injector of the group
- RareLow rail pressure from fuel vapour triggering follow-up faults
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.