Conditions for Setting the DTC

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Commanded Gear is 1st locked.
Gearbox Slip is 400 RPM or greater for 3 s.
If above conditions exist, the TCM commands second gear. If the gear ratio is between 2.72-3.01 for 1 s, the counter will increment. DTC will set after 3 occurrences.