P2149 Code: Fuel Injector Group “B” Supply Voltage Circuit / Open

On-board diagnostic (OBD) codes are designed to help mechanics and car owners find potential issues in a car. If your vehicle logs one, you must understand what it means before you attempt any fixes. One of the error codes that can be logged and retrieved from the OBD system is P2149.

What Does the P2149 Code Mean?

Diagnostic trouble code (DTC) P2149 stands for “Fuel Injector Group “B” Supply Voltage Circuit/Open.”

If the powertrain control module (PCM) detects that more than one of the fuel injectors in group B is not working properly, its diagnostics will log a P2149 code.

An electronic fuel injector system typically uses 12-volt solenoid-operated injectors. These fuel injectors have an armature and a spring-loaded needle valve or ball valve assembly.

The system applies a specific amount of voltage to the solenoid coil until the right level of current is reached. Once the solenoid is energized, fuel flows through the inlet filter screen to the spray nozzle.

The supply voltage is crucial to the operation of your fuel injection system, and circuit problems can cause significant drivability issues. So the PCM keeps track of any malfunction that’s related to the voltage supply.

When the PCM detects a possible fault within the supply voltage to the fuel injectors and/or other circuits, it logs code P2149. The “B” in this code points to the specific circuit where the fault is.

Note: The definition of code P2149 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What Are the Causes of the P2149 Code?

• Malfunctioning fuel injectors
• Damaged wiring harness
• Connector issues
• An issue with the PCM

What are the Common Symptoms of the P2149 Code?

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

How to Diagnose the P2149 Code

Different makes and models can set the error code P2149. However, this doesn’t mean that the steps for diagnosing the issue are the same for every vehicle. The process could differ depending on the year, make, and model of the vehicle.

If you don’t have the tools or know-how for the job, it’s best to leave the task to a licensed mechanic. Otherwise, you can tackle the issue on your own. Check out this video to get an idea of what the diagnostic process might involve:

How to Fix the P2149 Code

Although code P2149  is a generic trouble code, that doesn’t mean it has a universal solution. Keep in mind that vehicles can be structured differently depending on their make and model. So if you’re not familiar with auto repair, it’s better to contact a mechanic to fix the issue.

But if you’re an automotive DIYer, you can troubleshoot this code on your own. It’s a good idea to refresh your knowledge on fuel injection systems and auto repair before you get started. To determine the correct diagnostic steps, consult a vehicle-specific repair manual or an online repair database.