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.