Mazda 6 stop and start button issue with BCM, vehicle won't move or start on Mazda 6

Some Mazda 6 owners report experiencing issues with the stop and start button related to the Body Control Module (BCM), which can prevent the vehicle from moving or starting. These problems may stem from a malfunctioning BCM that affects various vehicle systems, leading to performance and comfort issues. Additionally, some owners find that starting system problems, such as a weak or dead 12v battery, can cause the engine to crank slowly or not at all, necessitating battery testing. Ignition issues, including a lack of spark, may also trigger misfire-related codes and prevent the engine from starting. Furthermore, a nearly dead key battery can complicate starting, although some owners have found success by holding down the unlock button while attempting to start the vehicle. To resolve these issues, it is recommended that owners consult a qualified mechanic for accurate diagnosis, consider jump-starting the car if a dead battery is suspected, and reprogram the key fob if the BCM has been replaced.