P2149 - FUEL INJECTOR GROUP "B" SUPPLY VOLTAGE CIRCUIT / OPEN

Fuel delivery systems use varying amounts of components to control the timing, volume, and pressure of the system. This entire process is performed in conjunction with the ECM (Engine Control Module). Injectors are used to control fuel delivery. Their injection or spray is electrically controlled, so voltage delivery is important when delivering fuel to the cylinders.

The ECM sets the diagnostic code P2149 OBD2 when it detects a fault in the voltage supply to the fuel injectors or one of its circuits. The letter “B” used in this code refers to the circuit where the fault is located. To determine how it applies to your vehicle, you should consult the manufacturer’s manual.

How does the P2149 Generic Fault Code work?

This is a generic powertrain DTC and is often found on OBD-II vehicles. This includes some of the following vehicles: Dodge Ram, GMC Chevrolet, VW, Audi, Ford, Mercedes Sprinter, Peugeot, Alfa Romeo, Nissan, Saab, Mitsubishi, among others. The precise repair steps can differ according to the vehicle’s year of manufacturing, the brand, model, and transmission configuration.

It is important to point out that fuel injectors form an essential portion of the fuel delivery systems in all modern cars. These systems employ a varying amount of equipment components to regulate and constantly track the volume, timing, pressure, etc. And as we shortly explained above, the fuel injector systems are matched with the ECM. These were brought in as a substitute for the carburetor because the injectors are more effective and cost-efficient in the management of fuel deliveries. As a consequence, they have greatly increased our fuel efficiency, and engineers are currently developing more optimal forms to enhance the effectiveness of this design.

Since injector spray is electronically operated, the boost voltage is critical to the provision of fuel to the cylinders. Yet, trouble in this circuit can result in major tampering issues among other potentially hazardous/symptomatic troubles

The ECM lights a MIL with code P2149 and/or associated codes (P2150, P2151) when monitoring for a fault in the fuel injector supply voltage or its circuits. It is worth noting that the fuel injector wiring harnesses are placed in such closeness to temperature extremes. Given the positioning of the belts, they are not immune to physical harm. With this in hand, it can be said that in the majority of situations, it is a mechanical fault.

• Check Engine light comes on
• General erratic engine operation.
• Engine loses power.
• Fuel consumption increases.
• An excessive amount of smoke is expelled from the exhaust.

The causes of the P2149 OBDII fault code are:

• Perhaps there is a faulty fuel injector cable or connector.
• Perhaps one or more fuel injectors have defects.
• ECM internal problem.

The steps to follow to correct the DTC P2149 OBD2 problems are:

• After knowing the group that this code refers to, according to the vehicle manufacturer, inspect the wires for damage. Repair it or replace it as required.
• Inspect the fuel injector connector. It may be corroded or have a poor electrical connection. Clean it as required.
• Use a multimeter to verify that the electrical values of the fuel injector circuit are as specified by the manufacturer. Make any necessary repairs.
• Replace the fuel injector.

It is VERY important to note that this DTC is more severe than you might think. Lack of fuel in the burned blend will greatly endanger the engine. It can cause severe damage both in the short term and in the long term. This state is known as the "lean" mode. That is why it is highly recommended to perform regular engine maintenance. Since lack of maintenance is the major trigger for this fault.