MY FOUR WHEEL DRIVE FAILED, WHILE ELECTRONIC LIGHT SHOWED CAR IN 4 WHEEL DRIVE. CAR SLID BACKWARDS INTO A RAVINE. ON SNOWY ROAD. LOCAL FORD DEALER DID NOT KNOW HOW TO FIX IT, BUT PROBLEM WAS EVENTUALLY TRACKED TO A FAULTY ELECTRONIC MODULE THAT FORD KNEW ABOUT. THIS CAUSED THE SOLENOID THAT ENGAGES 4 WHEEL DRIVE TO FAIL/ THIS WAS AN EXTREMELY DANGEROUS SITUATION. I WAS DRIVING OVER A SNOWY MOUNTAIN ROAD PREVIOUS DAY AND COULD HAVE SLIPPED OFF ROAD IF IT FAILED ONE DAY EARLIER. I SEE NUMEROUS EXAMPLES OF THE SAME PROBLEM. WHY DOESN'T FORD RESPOND?