since has gotten cold my keys don't always don't always open the tailgate

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. I do not know of any temperature related malfunctions. The radio frequency signal does not get influenced by temperature. If the tailgate is perhaps frozen - then it may not release. That is the only thing I can think of. Hands on testing can be performed to see if there are other malfunctions. Seek guidance at a local shop near you. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.