P2157 code meaning
Fuel Injector Group D Supply Voltage Circuit High
Powertrain system Generic code P21xx codes Check engine light
What P2157 means
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 gasoline 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.
P2157 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.8 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2157
- Check engine lamp on
- Misfire on the group D cylinders
- Several injector high codes stored together
Common causes of P2157
- Most likelyInternal hardware fault of the injector driver in the module
- PossibleGroup D supply wire shorted to battery voltage
- Less likelyInjector of group D with internal short
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injectorInjector wiringEngine control module
What each part of P2157 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 57 | The exact fault in that area. |
What to do next
- Note P2157 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2157
What does P2157 mean?
P2157 means "Fuel Injector Group D Supply Voltage Circuit High". P2157 flags the group D injector supply as too high. It is a generic code, so it means the same on every make.
Is it safe to drive with P2157?
Drive gently and only to a workshop. With P2157 the car can go into limp mode (reduced power) to protect itself.
Will P2157 fail an emissions test?
Yes, it can. P2157 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2157 to fix?
Difficulty: hard. A typical repair takes 0.8 to 5 hours of work. This is a job for a workshop.
Will P2157 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.