Powertrain, generic (extended)

P2154 Fuel Injector Group C Supply Voltage Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2154 is the high fault of injector supply group C. On GM's 2018 Duramax V8 it covers injectors 6 and 7: with the driver off, 0.5 Ω or less from a high-side pin to supply potential in 5 of 10 samples sets it, type A, one trip. Ford's 2023 diesels assign it to an internal error flagged by the module's high-voltage injector driver chip, a strong hint that the control unit itself is at fault. For GM petrol direct injection it means excess voltage on the high-side control line of cylinder 3, and GM PIP6034 lists it with P2148, P2151 and P2157 on 2024–25 2.5 L LK0 crossovers, where an internal PCM hardware fault requires replacing the module. Group C exists only where an engine has a third bank or cylinder. The low and open faults are P2153 and P2152.

Likely causes

Internal hardware fault of the injector driver in the module
Group C supply wire shorted to battery voltage
Injector of group C with internal short

Symptoms

  • Check engine lamp on
  • Misfire on the group C cylinders
  • Rough running at idle

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,000
Time0.8–5 h

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

Parts involved

fuel injectorinjector wiringengine control module

Related codes

P2152P2153P2151P2157P0268

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