I have been having this problem now on and off for over a year and am stuck on what the problem may be. Any time I drive my '07 Caliber on the highway for over 60-70 miles my transmission over temp light comes on and I have to shut the car down and let it reset. I originally had it looked at and the fluid was changed but the problem persisted. I have looked this problem up on the internet over and over and have not found a solution. I would like to believe it is a sensor but the dealership said they had no idea. I also saw some different discussions online saying that the transmission cooler may be bad in these cars so maybe that could be a possibility? My theory is that it's a sensor of some kind because I don't believe the trans is actually overheating. If it were to overheat, and I stopped for 5-10 minutes to let it cool down, then kept driving, it would have to overheat quicker the second time; when in actuality, I can drive the same distance again before it overheats. I know many people have had this problem but has anyone seen a solution or does anyone have any suggestions of how I can approach the dealer with this problem again? Here is some background on my car. It is an '07 with 129,000 miles and is maintained regularly. The miles are mostly highway and the car has given me little to no problems besides this transmission issue. Thanks in advance for your help.