P2151
Fuel Injector Group B Supply Voltage Circuit High
Injector circuit
Generic OBD-II
Medium
What it means
P2151 means the ECM detects abnormally high voltage on the supply circuit feeding fuel-injector "Group B." A whole group of injectors shares this feed, so a fault here can make those cylinders run rough or misfire. It's usually a wiring short to power, a bad connector, or a failing injector control module rather than the injectors themselves.
Medium
Can I keep driving? Can cause rough running or hard starting if a group of injectors loses proper supply; driveable in many cases, but get it checked soon.
Common symptoms
What you'll notice
- Check-engine light on
- Rough running or misfire on the affected injector group
- Hard starting or stalling in some cases
- Reduced power
Common causes
Most likely first
- Wiring fault (short to voltage) in the injector Group B supply circuitLikely
- Poor or corroded connector on the injector control module or harnessCommon
- Faulty fuel injector control module or driverCommon
- PCM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Do a visual inspection of the Group B injector wiring and connectors.
- Check the injector control module (FICM) supply-voltage circuit for a short to power.
- Test the control-module ground circuits against battery ground.
- Repair the wiring or connectors; replace the control module if it fails testing.
- Clear the code and retest.
FAQ
Quick answers
Is it safe to drive with P2151?+
Often for short trips, but if the fault is disrupting fuel supply to a group of injectors you may get rough running, hard starts, or stalling. Have it diagnosed soon.
Can I just clear P2151?+
You can, but it will reset if the supply-circuit wiring or the injector control module is at fault. Fix the electrical problem first.
Related codes
Often seen with P2151
Read & clear P2151 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