My wife was driving down the highway when she asked me to look at our instrument cluster. Wow the drive light was on ! It was shining bright for about 20 minutes and was then gone again into the abyss . We started trying to figure out when it was last on... Around the 70,000 mile mark the best we can remember or about 15 years ago. The truck is now approaching 400,000 miles. Why after this much time the light came on is a mystery. Maybe in another 15 years or so it will revisit us. Mike