The Engine Control Module (ECM) and other components control the volume, timing, and pressure of the fuel system. Among these components are the injectors, which deliver fuel in a sprayed and drip-free manner, thus achieving an even fuel distribution according to the engine’s operation.
The P2146 OBDII diagnostic code is set when the ECM detects an open circuit in the supply voltage to the “A” fuel injector group. The supply voltage is necessary to achieve good fuel delivery to the cylinders because the injectors are electronically controlled.
The “A” designation is used to specify an exact circuit. Therefore, it is necessary to consult the manufacturer’s source of information to find out where it applies to your vehicle.