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P0721

Hi....the best thing to do is request a diagnostic based on the trouble code, P0721 (https://www.yourmechanic.com/article/p0721-obd-ii-trouble-code-output-speed-sensor-range-performance-by-valerie-johnston), that you have in hand. Resolve that first as the fault behind the trouble code may account for the shift difficulty you are having....

These are the following definitions for the codes you've received: P0864 - Transmission control module (TCM) communication circuit -range/performance problem P0070 (https://www.yourmechanic.com/article/p0070-obd-ii-trouble-code-ambient-air-temperature-sensor-circuit-by-jamahl-walker) - Ambient Air Temperature Sensor - (possibly shorted but most likely not related) P0734 - Gear 4 Incorrect...