P2154Fuel Injector Group C Supply Voltage Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Check engine lamp on
- Misfire on the group C cylinders
- Rough running at idle
- Likely causes
- LikelyInternal hardware fault of the injector driver in the module
- PossibleGroup C supply wire shorted to battery voltage
- RareInjector of group C with internal short
- 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 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.