P2154 code meaning
Fuel Injector Group C Supply Voltage Circuit High
Powertrain system Generic code P21xx codes Check engine light
What P2154 means
P2154 is the high fault of injector supply group C. On GM's 2018 Duramax V8 it covers injectors 6 and 7: with the driver off, 0.5 Ω or less from a high-side pin to supply potential in 5 of 10 samples sets it, type A, one trip. Ford's 2023 diesels assign it to an internal error flagged by the module's high-voltage injector driver chip, a strong hint that the control unit itself is at fault. For GM gasoline direct injection it means excess voltage on the high-side control line of cylinder 3, and GM PIP6034 lists it with P2148, P2151 and P2157 on 2024–25 2.5 L LK0 crossovers, where an internal PCM hardware fault requires replacing the module. Group C exists only where an engine has a third bank or cylinder. The low and open faults are P2153 and P2152.
P2154 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 P2154
- Check engine lamp on
- Misfire on the group C cylinders
- Rough running at idle
Common causes of P2154
- Most likelyInternal hardware fault of the injector driver in the module
- PossibleGroup C supply wire shorted to battery voltage
- Less likelyInjector of group C 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 P2154 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. |
| 54 | The exact fault in that area. |
What to do next
- Note P2154 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 P2154
What does P2154 mean?
P2154 means "Fuel Injector Group C Supply Voltage Circuit High". P2154 is the high fault of injector supply group C. It is a generic code, so it means the same on every make.
Is it safe to drive with P2154?
Drive gently and only to a workshop. With P2154 the car can go into limp mode (reduced power) to protect itself.
Will P2154 fail an emissions test?
Yes, it can. P2154 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 P2154 to fix?
Difficulty: hard. A typical repair takes 0.8 to 5 hours of work. This is a job for a workshop.
Will P2154 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.