Powertrain, generic (extended)

P2155 Fuel Injector Group D Supply Voltage Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2155 is the open or general fault of the fourth shared injector supply. On GM's 2009 Duramax V8 group 4 joins injectors 8 and 3; an open, short or missing load for 6 ms sets the code, type A. The Passat VR6 of 2014 runs four supply groups and checks group D against a high-side current window of under 2.6 A or above 14.9 A. GM petrol direct injection uses it for the high-side control line of cylinder 4. In the Saab 9-5 2.0T the supply lines are shared by cylinders 1 and 4, which is why a supply fault there stores P2146 and P2155 together (1 s, type B). The 2023–24 Corvette LT6 bulletin 24-NA-106 names P2155 among codes caused by water entering a wrong bank 2 connector. Rough running and misfire on the affected cylinders follow.

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
Faulty power stage in the engine control module

Symptoms

  • Misfire on the group D cylinders
  • 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

P2146P2152P2156P2157P0204

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