Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P2146 OBD-II Trouble Code: Fuel Injector Group “A” Supply Voltage Circuit/Open

P2146 OBD-II Trouble Code: Fuel Injector Group “A” Supply Voltage Circuit/Open

Check Engine Light

P2146 code definition

Fuel Injector Group “A” Supply Voltage Circuit/Open

What the P2146 code means

P2146 is an OBD-II generic code for the engine control module (ECM) detecting that the fuel injector group “A” supply voltage circuit is open. This could be from bank 1 or the “A” supply voltage circuit that is open.

What causes the P2146 code?

  • The engine control module (ECM) is getting a voltage return from the fuel injectors and monitors the supply voltage to the injectors. Some vehicles supply voltage in groups or banks. If the voltage supply circuit is open or zero volts, then the code P2146 is set and the Check Engine Light is turned on.

  • A broken wire or connector on supply voltage circuit

What are the symptoms of the P2146 code?

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

  • The engine will run very rough or stall.

  • The engine will be hard to start or will not stay running after starting.

How does a mechanic diagnose the P2146 code?

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

  • Measures the voltage on the injector supply circuit

  • Diagnose and repairs code P2146 by following the manufacturer pinpoint tests

  • Checks the wiring and connector to the supply circuit for breaks or loose connections

Common mistakes when diagnosing the P2146 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

  • Failing to follow the pinpoint test completely causing the wrong part to be diagnosed

How serious is the P2146 code?

Code P2146 is a major failure in the fuel injector voltage supply circuit and will cause the engine to run very rough and misfire.

What repairs can fix the P2146 code?

Additional comments for consideration regarding the P2146 code

Code P2146 is for diesel and some gas motors and the failure may be the ECM and on some vehicles they may have a separate injector driver module that may cause the code.

Need help with a P2146 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
Icon-warranty_badge-02

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

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.

GET A QUOTE

More related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
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...


Related questions

Q: AT light and Check engine light on stuck in third gear.

A logical place to start is with a Check Engine Light inspection to see what codes might be set. Usually with something of this nature, codes will be present, and there will be a flow chart that should be used...

Q: Check engine light coming on

Cold weather causes plastic and rubber components to contract. The intake manifold on my truck would expand and contract every winter, setting P0171 and P0174 lean codes. Then finally, this past winter, the manifold cracked. My guess is that you...

Q: Check engine light

Hello. I know how frustrating this can be. This needs to be a hands on inspection of the codes and system. We at YourMechanic can have a technician come to you and inspect your vehicle and definitively diagnose the Check...