P2150 code meaning
Fuel Injector Group B Supply Voltage Circuit Low
Powertrain system Generic code P21xx codes Check engine light
What P2150 means
P2150 reports the common feed of injector group B shorted toward ground. In GM's 2018 Duramax tables group 2 holds injectors 2 and 3 on the 2.8 L four-cylinder but injectors 2 and 5 on the 6.6 L V8; the test is the same as for group A – 0.5 Ω or less to ground with the driver on, 5 failed samples out of 10, type A with lamp on the first trip. Ford's 2023 diesels flag a short of group B to ground or battery, detected by the driver chip in roughly 0.2 s. GM gasoline direct injection, documented for the Saab 9-5 2.0T, uses P2150 for low voltage on the high-side control line of cylinder 2. Because both injectors of a diesel bank lose their feed, the engine runs on fewer cylinders. P2149 is the open circuit, P2151 the high fault of this group.
P2150 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2150
- Two cylinders misfire together
- Marked power loss and vibration
- Check engine lamp on immediately
Common causes of P2150
- Most likelyGroup B supply wire chafed and shorted to ground
- PossibleInjector of group B shorted to its body
- PossibleMoisture in the injector harness connector
- Less likelyFaulty injector driver in the engine control module
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 P2150 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. |
| 50 | The exact fault in that area. |
What to do next
- Note P2150 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 P2150
What does P2150 mean?
P2150 means "Fuel Injector Group B Supply Voltage Circuit Low". P2150 reports the common feed of injector group B shorted toward ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P2150?
Drive gently and only to a workshop. With P2150 the car can go into limp mode (reduced power) to protect itself.
Will P2150 fail an emissions test?
Yes, it can. P2150 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 P2150 to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P2150 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.