Automatic Transmission Control Module problems of the 2026 Honda Passport

While passing at highway speeds under heavy acceleration, the transmission system on my 2026 Honda Passport with approximately 7,000 miles malfunctioned. Multiple warning messages appeared, including “transmission system problem. Reverse gear not available. See your dealer,” “transmission system problem. Avoid heavy acceleration and high speed. See your dealer,” “transmission system problem. Paddle shifters not available. See your dealer,” and “emissions system problem. Power may be reduced. See your dealer. ” the vehicle then shifted into a middle gear and remained there, reducing normal drivability during a passing maneuver. I was able to pull over safely. After turning the vehicle off and back on, the warnings cleared temporarily, but the failure repeated multiple times. The safety concern is that the malfunction occurred during highway-speed passing and affected propulsion/gear availability. No crash or injury occurred. A Honda dealer pulled diagnostic codes p097f-17 and u3500-16 and stated that the tcm inside the transmission needed replacement. A second Honda dealer later reproduced the problem, consulted Honda technical support, and Honda approved replacement of the full transmission under warranty. The vehicle has been repaired and is available for inspection upon request. The failed transmission was replaced under warranty, so whether the original failed component remains available for inspection is unknown.