P2147 code meaning
Fuel Injector Group A Supply Voltage Circuit Low
Powertrain system Generic code P21xx codes Check engine light
What P2147 means
P2147 means the common feed of injector group A is pulled toward ground. GM documents it in detail for its 2018 Duramax diesels: the high-side line to injectors 1 and 4 (group 1 on both the 2.8 L four and the 6.6 L V8) shows 0.5 Ω or less to ground while the driver is switched on; with the engine running and more than 11 V, 5 failures in 10 samples at 100 ms set it, type A, lamp on the first trip (2025 tables: 4 of 8). Ford's 2023 diesels report a short of group A to ground or battery found by the driver chip after about 0.2 s. On GM gasoline direct injection such as the Saab 9-5 2.0T the code stands for low voltage on the high-side control line of cylinder 1. Both injectors of the group usually stop, so two cylinders drop out. P2148 is the opposite fault.
P2147 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 P2147
- Two cylinders misfire at once
- Heavy loss of power, rough running
- Check engine lamp on immediately
Common causes of P2147
- Most likelyInjector supply wire chafed and shorted to ground
- PossibleInjector of the group shorted internally to its body
- PossibleWater 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 P2147 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. |
| 47 | The exact fault in that area. |
What to do next
- Note P2147 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 P2147
What does P2147 mean?
P2147 means "Fuel Injector Group A Supply Voltage Circuit Low". P2147 means the common feed of injector group A is pulled toward ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P2147?
Drive gently and only to a workshop. With P2147 the car can go into limp mode (reduced power) to protect itself.
Will P2147 fail an emissions test?
Yes, it can. P2147 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 P2147 to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P2147 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.