P2146 Code: Fuel Injector Group “A” Supply Voltage Circuit / Open

The fuel injectors control how much pressurized fuel goes into the engine every cycle. Each cylinder typically has one injector that feeds it fuel, and the powertrain control module (PCM) assigns them into groups of two for convenient monitoring and control.

If the PCM detects that more than one of the fuel injectors in group A is not working properly, its diagnostics will log a P2146 code.

What Does the P2146 Code Mean?

Diagnostic trouble code (DTC) P2146 stands for “Fuel Injector Group “A” Supply Voltage Circuit/Open.”

Group “A” refers to a particular injector group in the engine. Check a repair manual or repair database to determine which group this refers to.

The PCM controls the fuel injectors electronically. During each intake stroke in the engine, the computer usually provides a ground to the appropriate injector.

The signal prompts the injector to spray a certain amount of fuel into the cylinder to mix with air and burn to produce power. The heavier the load placed on the engine, the more fuel is needed.

Because modern fuel injectors are electronic devices, a steady and sufficient supply voltage is critical for their operation. The voltage is drawn from a power source that is used to run a device–in this case, the injectors.

The PCM regularly checks the fuel injectors and their wiring. If the computer detects an open circuit or a problem with the supply voltage circuit of the group A injectors, it will set the powertrain code P2146.

Note: The definition of code P2146 can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P2146 Code?

• Bad fuel injector
• Faulty PCM
• Problems with the fuel injector wiring

What are the Common Symptoms of the P2146 Code?

• Illuminated check engine light
• Engine runs roughly and lacks power

How to Diagnose the P2146 Code

The P2146 code is a generic powertrain code that various makes and models can log. However, this does not mean there is a one-size-fits-all solution to identify its underlying problem.

If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here are some videos that can give you an idea of what the process might involve:

How to Fix the P2146 Code

Attempting to fix a P2146 code can become a frustrating task if you don’t have the right tools and know-how to do it. In most cases, it’s best to leave the job to professionals.

But if you have the tools and technical knowledge to address the issue, you can address the P2146 code on your own. Just make sure to consult a repair manual or an online repair database that’s specific to your vehicle before you get started.