Can I have GM fix my water in the trunk from taillight leak?
Of course you can! But bring your checkbook because they won’t fix it for free.
This would probably be cheaper at a good local independent mechanic or even a body shop in this case.
Not for free, but are you sure that’s where the water is coming from?? I had a grommet out of place after they put my hitch on that leaked in the trunk. Thought it was the tail lights. Took a while to find it though so a dealer body shop should know just where to look.