What does code P1739 transmission power up at speed mean?

Code P1739 indicates a transmission-related issue, specifically that the transmission control module has detected a problem with the power-up sequence of the transmission when the vehicle is in motion. This could be linked to issues such as low fluid levels, electrical faults, or malfunctions in the transmission solenoids. It's important to diagnose the underlying cause to prevent potential damage and ensure proper transmission function. A professional mechanic should be consulted for accurate diagnosis and repair.