Powertrain, generic (extended)

P2151 Fuel Injector Group B Supply Voltage Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Internal fault of the injector boost circuit in the module
Software falsely detecting the fault, reprogramming available
Group B supply wire shorted to battery voltage
Injector of group B with internal short

Symptoms

  • Check engine lamp on
  • Misfire on the group B cylinders
  • Sometimes no noticeable symptom besides the lamp

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,000
Time0.8–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injectorinjector wiringengine control module

Related codes

P2149P2150P2148P2154P0265

References: gsi.ext.gm.com, fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov.