P2151

Fuel Injector Group B Supply Voltage Circuit High

Q: 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.

Q: 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.

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.

Real-world scan data

Seen in

105

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P2151 scans

P2150in 71.4% of scans

P0562in 70.5% of scans

P0406in 65.7% 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
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.

Read & clear P2151 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