Chevrolet Tahoe transmission and thermostat suspension issues requiring dealership repair on Chevrolet Tahoe

Some Chevrolet Tahoe owners report experiencing transmission issues, including harsh shifts and problems with the transfer case, particularly in 2018 models. Additionally, they note challenges with the transmission cooler and difficulties with the transmission shifting out of park. Owners have also reported that a failure in the transfer-case encoder motor position sensor or the selector switch can trigger fault codes, indicating a need for service on the four-wheel-drive system. Furthermore, some Tahoe owners report thermostat suspension issues, such as a malfunctioning thermostat that can lead to symptoms like no heat, a spiked temperature gauge, and potentially serious problems like a blown head gasket. It is advisable for owners facing these issues to consult with a dealership technician for accurate diagnosis and repair to ensure optimal vehicle performance.