P2148Fuel Injector Group A 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
- P2148 flags group A's injector supply as too high. On GM's 2018 Duramax the high-side terminal of injector 1 or 4 shows 0.5 Ω or less to supply potential while the driver is off; same 5-of-10 counting at 100 ms, type A. Ford's 2023 diesels give it a different meaning: the chip that produces the boosted injector voltage inside the module reports an internal fault – a pointer to the control unit rather than the harness. GM's petrol direct injection reads it as excess voltage on the high-side control line of cylinder 1. Bulletins show software and hardware causes: Hino's 2016 J08 trucks set P2148 and P2151 falsely until the ECU is reprogrammed (SB-15-023), and GM PIP6034 replaces the PCM on 2024–25 2.5 L LK0 models. The low fault is P2147.
- What you may notice
- Check engine lamp on
- Misfire and rough running on the affected cylinders
- Often no drivability complaint when the cause is software
- Likely causes
- PossibleInjector supply wire shorted to battery voltage
- PossibleInternal fault of the injector boost circuit in the module
- PossibleSoftware falsely detecting the fault, reprogramming available
- RareInjector of the group 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.