Chevrolet Uplander not shifting into 2nd gear after TCM replacement on Chevrolet Uplander

Some Chevrolet Uplander owners report experiencing difficulties with shifting into 2nd gear after a Transmission Control Module (TCM) replacement. These issues may stem from faulty solenoids, which, if replaced, could resolve the shifting problem since the TCM manages gear operations. Additionally, some owners find that low or contaminated transmission fluid affects performance, making it crucial to check the fluid level and quality to ensure proper transmission function. Addressing these potential causes promptly is advisable to restore normal shifting capabilities.