Q: You don't mention any transmission related issues such as slamming during gear changes, so I assume the transmission seems fine other than the warning light. Can you read a code to get more specific?
A: I don't have a specific code associated with the error. There is no slamming, except at a speed that spans 3 and 4th gears. Once the error appears, the car remains in 3rd gear. It is actually intriguing as if I get to high speed before the error, the shifting is smooth and the car runs fine, but once it downshifts, it stays in 3rd.
Thank your for the voltmeter suggestion.