P2149

Fuel Injector Group B Supply Voltage Circuit/Open

Q: 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.

Q: 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.

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.

Real-world scan data

Seen in

185

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2149 scans

P0201in 43.8% of scans

P2146in 42.7% of scans

P0203in 42.2% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2149 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX