P2151Fuel Injector Group B 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
- P2151 marks the group B injector supply as too high. GM's 2018 Duramax checks the high-side pins of the bank 2 injectors with the driver switched off and sets the code at 0.5 Ω or less to supply potential, 5 of 10 samples, type A. On Ford's 2023 diesels the same number stands for an internal fault reported by the boost voltage chip of the module, so a harness check alone rarely solves it. GM petrol direct injection uses it for excess voltage on the high-side control line of cylinder 2. Bulletins point mostly to the control unit: Hino's 2016 J08 engines set P2148 and P2151 falsely and need new ECU software (SB-15-023), and GM PIP6034 replaces the PCM of 2024–25 Traverse, Acadia and Enclave with the 2.5 L LK0. P2150 is the low counterpart.
- What you may notice
- Check engine lamp on
- Misfire on the group B cylinders
- Sometimes no noticeable symptom besides the lamp
- Likely causes
- PossibleInternal fault of the injector boost circuit in the module
- PossibleSoftware falsely detecting the fault, reprogramming available
- PossibleGroup B supply wire shorted to battery voltage
- RareInjector of group B 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.