P2148

Fuel Injector Group A Supply Voltage Circuit High

Fuel injector circuit Generic OBD-II Medium

What it means

P2148 means the ECM has detected abnormally high voltage on the supply circuit that powers fuel-injector group A. That supply feeds the injectors' driver stage, so a fault here can leave those cylinders under-fueled — causing misfire, rough running, hard starting, or a stall. It's typically a wiring short-to-voltage, a bad connection, or a failing injector control module.

Medium

Can I keep driving? Risky — a fuel-injector supply fault can cause stalling, misfire, or a no-start on the affected group; have it diagnosed promptly.

Real-world scan data

Seen in

322

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2148 scans

P1646in 59.9% of scans

P0704in 50.6% of scans

P1605in 40.4% 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, misfire, or hesitation
Hard starting or stalling on the affected cylinder group
Reduced power

Common causes

Most likely first

Wiring or connector fault in the injector supply-voltage circuit (short to voltage)Likely
Poor connection or corrosion at the injector driver/module connectorCommon
Faulty fuel injector control module (FICM) or injector driverCommon
ECM/PCM supply-driver faultLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check for companion injector-group codes (P2146, P2147, P2149).
Visually inspect the injector harness and connectors for damage, chafing, or a short to power.
Check the injector control module (FICM) supply-voltage circuit for the correct feed.
Test the control-module ground circuits against battery ground for a clean, low-resistance path.
If wiring and grounds are good, suspect the injector control module or ECM driver.

FAQ

Quick answers

Is it safe to drive with P2148?+

Only briefly — if the injector group loses proper supply the engine can stall or refuse to start, so get it checked before longer trips.

Can I just clear P2148?+

You can clear it, but a supply-voltage fault will return until the wiring, ground, or control module is repaired.

Read & clear P2148 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