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.
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.
Related codes
Often seen with P2148
Read & clear P2148 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