Check engine light came on. code 713 (transmission fluid temp sensor). Replaced. Would not shift into overdrive. After 50 miles shifted into overdrive. Light came on (code 713). Dealer said it must be TCM (transmission control module) giving false signal to ECM (engine control module) to turn on light. This model has TCM and ECM in same unit. Replaced. Would not shift into overdrive. After 50 miles shifted into overdrive. Light came on (code 713). Transmission works perfectly when light is on. Smooth clean shifts with no slipping. Any suggestions?