DTC code P0650 OBDII indicates that the Powertrain Control Module (PCM) has located a fault in the electrical circuit of the malfunction indicator lamp (MIL). This lamp is also known as “Check Engine Light” or “Engine Service Soon”.
What happens is that there are vehicles where the PCM voltage is either too high or too low. There may even be no voltage present. The Powertrain Control Module (PCM) controls the lamp when it monitors the lamp ground circuit and checks the voltage in that ground circuit.
It should be mentioned that a normal malfunction indicator lamp activity is that it lights up for some seconds, then goes out when the engine is started or when the car is started.