HELLO GENTLEMAN'S, I WAS HAVING THIS SAME PROBLEM AND I BELIEVE I FOUND THE ISSUE AN A POSSIBLE INTERIM SOLUTION. WHEN THE START SWITCH PUSH BOTTOM IS SELECTED, THE ELECTRICAL CIRCUIT FOR THE ELECTRICAL STARTER WILL BE INITIATE FASTER THAN THE TIME THAT IT TAKES FOR THE COMPUTER TO BOOT UP TO AND TAKE CONTROL OF THE STARTING SEQUENCES, HOW DO I KNOW THAT!! BECAUSE IF YOU PUSH THE START BUTTON FIRST WITHOUT PUSHING THE BRAKE PEDAL, WAIT FOR 2 SECOND AND THEN PUSH THE PEDAL AND THE START BUTTON IT WILL WORK EVERY TIME.
I HOPE THIS HELP. I WAS HAVING THIS PROBLEM CONSTANTLY ALMOST EVERY DAY, AND FOR THE LAST 4 MONTHS I HAVEN'T HAD ANY ISSUES.
GM MUST FIX THIS ISSUE.