P2150
Fuel Injector Group B Supply Voltage Circuit Low
Injector circuit
Generic OBD-II
Medium
What it means
P2150 means the ECM detected low voltage on the supply circuit that powers fuel injector group 'B'. Injectors need full battery voltage to open properly; when the feed drops, that group of cylinders can misfire, run rough, or lose fuel — so it's worth tracing the wiring and connections promptly.
Medium
Can I keep driving? Low power to a bank of injectors can cause misfires, rough running, or a stall, so treat it as drive-with-caution and get it looked at soon.
Common symptoms
What you'll notice
- Check-engine light on
- Rough running or misfire (may affect one bank of cylinders)
- Hesitation or loss of power
- Possible hard starting or stalling
Common causes
Most likely first
- Poor connection or corrosion in the injector group B power-supply circuitLikely
- Open or shorted wiring in the group B supply harnessCommon
- Blown fuse or relay feeding the injector group (where fitted)Common
- Faulty fuel injector control module / injector driverLess often
How to diagnose & fix
Work through it in order
- Visually inspect the group B injector wiring, connectors, and any related fuse/relay for damage or corrosion.
- Check the supply voltage feeding the injector group with the key on.
- Test the injector control module grounds against battery ground.
- Repair any open/shorted wiring or poor connections found.
- If supply and wiring are good, have the injector control module evaluated.
FAQ
Quick answers
Is it safe to drive with P2150?+
Only cautiously. If a group of injectors is losing power the affected cylinders can misfire or cut out, which risks a stall — get it diagnosed soon.
Can I just clear P2150?+
It returns while the supply circuit is faulty, and the running problems come back with it. The wiring or control module has to be repaired.
Related codes
Often seen with P2150
Read & clear P2150 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