Some Chevrolet Uplander owners report experiencing issues with the transmission not engaging in regular drive gear, while still functioning in gears 1, 2, and reverse. These problems may be accompanied by odd noises from the transmission or engine area, potentially indicating issues with gears, linkage, or other components affecting proper shifting. Internal transmission failure, low transmission fluid, or a faulty Vehicle Speed Sensor (VSS) can lead to the transmission being stuck in 1st gear or limp mode, with the speedometer displaying zero. Additionally, inconsistent shifting from first to second gear may be attributed to worn 3rd or 4th gear clutches. Low transmission fluid levels could hinder proper engagement, necessitating a fluid level check. Some owners also report issues related to a faulty Pressure Shift Solenoid, even when fluid levels are adequate. If the Transmission Control Module (TCM) is suspected of causing problems, unplugging it may temporarily restore gear engagement, although optimal vehicle performance may not be guaranteed. It is recommended that owners seek a qualified mechanic to diagnose and address these transmission issues to ensure their Chevrolet Uplander operates smoothly in all gears.