P2149 code meaning
Fuel Injector Group B Supply Voltage Circuit/Open
Powertrain system Generic code P21xx codes Check engine light
What P2149 means
P2149 is the open or general fault of the second shared injector supply. Group membership depends on the engine: GM's 2009 Duramax places injectors 7 and 6 in group 2 (6 ms, type A), whereas GM's 2018 tables pair injectors 2 and 5 in the V8 – so the cylinders must be looked up for each engine. VW's 2014 TSI and VR6 engines use the same current window as for group A, under 2.6 A or above about 14.7–14.9 A. GM gasoline direct injection treats P2149 as the high-side control line of cylinder 2: on the 2023–24 Corvette LT6 bulletin 24-NA-106 traces it, with rail pressure codes, to water entering a wrong 12-way connector on bank 2. A Mercedes M254 bulletin lists P2149 among faults caused by fuel boiling in the low-pressure system.
P2149 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 P2149
- Misfire on the cylinders of group B
- Rough running and reduced power
- Check engine lamp on
Common causes of P2149
- Most likelyInjector harness damaged or wire open
- PossibleWater entering an injector harness connector
- PossibleOpen coil or piezo stack in an injector of the group
- Less likelyLow rail pressure from fuel vapour triggering follow-up faults
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 P2149 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. |
| 49 | The exact fault in that area. |
What to do next
- Note P2149 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 P2149
What does P2149 mean?
P2149 means "Fuel Injector Group B Supply Voltage Circuit/Open". P2149 is the open or general fault of the second shared injector supply. It is a generic code, so it means the same on every make.
Is it safe to drive with P2149?
Drive gently and only to a workshop. With P2149 the car can go into limp mode (reduced power) to protect itself.
Will P2149 fail an emissions test?
Yes, it can. P2149 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 P2149 to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P2149 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.