P2151: Fuel Injector Group B Supply Voltage Circuit High
Standardized SAE J2012 code · P21xx — Fuel & air metering and auxiliary emission controls
What does P2151 mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine lamp on
- Misfire on the group B cylinders
- Sometimes no noticeable symptom besides the lamp
Common causes
- Medium Internal fault of the injector boost circuit in the module
- Medium Software falsely detecting the fault, reprogramming available
- Medium Group B supply wire shorted to battery voltage
- Low Injector of group B with internal short
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2151 on the same make and model first.
P2151 in the community
Ask about P2151No one has posted about P2151 yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P2151 problem