P2149
Fuel Injector Group B Supply Voltage Circuit/Open
Fuel injection
Generic OBD-II
High
What it means
P2149 means the supply-voltage circuit feeding fuel injector group "B" is open or not delivering the expected power. Injectors are wired in groups, so if that feed is lost the whole group can stop firing — leading to a heavy misfire, the engine running on partial cylinders, or a no-start. This is a genuine fuel-delivery fault, usually in the wiring, a connector, or the injector control module.
High
Can I keep driving? A whole group of injectors can lose power, so the engine may misfire badly, run on part of its cylinders, or fail to start — treat it as a repair-now fault.
Common symptoms
What you'll notice
- Check-engine light on
- Hard starting, stalling, or a no-start if the group loses power
- Heavy misfire or the engine running on only some cylinders
- Rough running and noticeably reduced power
Common causes
Most likely first
- Open or shorted supply-voltage wiring to injector group BLikely
- Poor, corroded, or loose connector in the group B supply circuitCommon
- Faulty fuel injector control module (FICM) / driver supplying the groupCommon
- Blown fuse or relay feeding the injector group (where fitted)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and do a careful visual inspection of the injector group B wiring and connectors.
- Check the supply voltage feeding the injector group / FICM against battery voltage.
- Test the control-module ground circuits against battery ground for a clean, low-resistance path.
- Confirm any relevant fuses or relays, then repair the open circuit or replace the control module if it isn't supplying voltage.
FAQ
Quick answers
Is it safe to drive with P2149?+
No. If a group of injectors loses supply voltage the engine can misfire severely or quit, which risks converter damage and leaving you stranded — get it repaired first.
Can I just clear P2149?+
It will return immediately if the circuit is open. This is a power-supply fault to the injectors, so the wiring or control module must actually be repaired.
Related codes
Often seen with P2149
Read & clear P2149 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX