Powertrain, generic (extended)

P2149 Fuel Injector Group B Supply Voltage Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Injector harness damaged or wire open
Water entering an injector harness connector
Open coil or piezo stack in an injector of the group
Low rail pressure from fuel vapour triggering follow-up faults

Symptoms

  • Misfire on the cylinders of group B
  • Rough running and reduced power
  • Check engine lamp on

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injectorinjector wiringengine control module

Related codes

P2146P2150P2151P2152P0202

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.