Skip the auto shop - Our mechanics make house calls

P2148 OBD-II Trouble Code: Fuel Injector Group A Supply Voltage Circuit High

Check Engine Light

What the P2148 code means?

P2148 is an OBD-II generic code for the engine control module (ECM) detecting the fuel injector group A supply voltage circuit has a high resistance causing a short in the system.

What causes the P2148 code?

  • The ECM monitors the voltage supply circuit to the injectors and if the circuit has a high resistance like a shorted injector or harness for the A group of injectors then the code will be set and the Check Engine light will be turned on.

  • This code is for an engine that has supply power to the injectors in two different banks of injectors instead of all injectors on one power supply. This code is for bank A shorted.

What are the symptoms of the P2148 code?

  • The Check Engine light will be illuminated and the code is set in ECM memory as a fault.

  • The vehicle may not run if no power supply is getting to half of the injectors in the engine.

  • On some vehicles, the vehicle may run at very low power and may stall at idle if it does run.

How does a mechanic diagnose the P2148 code?

  • Scans for and documents the codes in the ECM and looks at the freeze frame data for the failure.

  • Checks the injection system power supply wires and injectors for any shorted harnesses.

  • Disconnects all the injectors on bank one and rechecks power to injectors for a short.

  • Reconnects one injector at a time to see if one is shorted or tests each injector for resistance shorts.

Common mistakes when diagnosing the P2148 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired

  • Failing to clear the ECM codes after the codes are fixed

  • Replacing all the injectors when only one is bad

How serious is the P2148 code?

Code P2148 is a problem with the injector supply voltage to one bank of injectors is shorted by a harness or injector short. This will most likely cause the vehicle to not start or stay running if it does start.

What repairs can fix the P2148 code?

  • Replace the shorted injector.
  • Repair the connector pins for corrosion or shorts in the harness.
  • Clear the codes and retest to verify the problem is not present after repairs are made.

Additional comments for consideration regarding the P2148 code

Code P2148 is for a short in the supply voltage of the injectors and may blow a fuse on some applications. The power may be controlled through a relay that is shorted on some applications, so follow the manufacture pinpoint tests to diagnose your vehicle using this article as a guide.

Need help with a P2148 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...

Related questions

Q: Check Engine Light is on, trouble code P0011&12. I changed the oil and filter. I need to turn off the engine light to see if that problem is solved.

Hello. If the oil level was low or if the wrong oil war previously used then that can cause these codes to come up. Most of the time though, on this engine, it is caused by a failure in the...

Q: What makes the check engine light come on?

The drive complaint you described seems to be an engine misfire, which can be verified by scanning the cars computer for an error code. If you get a code P0300, P0302, P0304 or P0306 then Jeep has issued a Technical...

Q: Starting problem

At 180.000 miles, it could be just about anything. The P0161 and P0140 codes are oxygen sensor codes, and probably don't have anything to do with the starting issue, though you should have that investigated. The P0300 code however is...