P2157Fuel Injector Group D 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
- P2157 flags the group D injector supply as too high. GM's 2018 Duramax V8 tests the high-side pins of injectors 3 and 8 with the driver off; 0.5 Ω or less to supply potential in 5 of 10 samples sets it, type A, one trip, and the 2025 tables require 4 of 8. For GM petrol direct injection, documented in the Saab 9-5 2.0T procedure, it means excess voltage on the high-side control line of cylinder 4. GM's preliminary information PIP6034 for 2024–25 Traverse, Acadia and Enclave with the 2.5 L LK0 names P2157 alongside P2148, P2151 and P2154 and blames an internal PCM hardware fault – several high codes at once point to the module rather than to four separate wiring faults. P2156 is the low and P2155 the open circuit of this group.
- What you may notice
- Check engine lamp on
- Misfire on the group D cylinders
- Several injector high codes stored together
- Likely causes
- LikelyInternal hardware fault of the injector driver in the module
- PossibleGroup D supply wire shorted to battery voltage
- RareInjector of group D 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.