Powertrain, generic (extended)

P2157 Fuel Injector Group D Supply Voltage Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Internal hardware fault of the injector driver in the module
Group D supply wire shorted to battery voltage
Injector of group D with internal short

Symptoms

  • Check engine lamp on
  • Misfire on the group D cylinders
  • Several injector high codes stored together

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

P2155P2156P2154P2148P0271

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