GMC Troubleshooting Questions? Ask a Mechanic for Answers
hi my name is ***** ***** I can help you, first of all did you add anything to you tail gate ? eg; deflector etc. if no modifications, are the new struts OME original factory replacement parts? if so and still same problem we have encountered that same problem as well with other models and there was an updated or improved replacement part, ask the dealer if they have an up dated part number for them. it may be a problem the manufacturer is working on , another potability is to locate an after market supplier that may carry heavier ones. It's the gas charge in them that is supposed to lift it so if they originally did work if you haven't added things to the tail gate they should in theory work. but go that extra rout and check for updates and stronger ones. Hope this helps let me know.
let me get back to you on that will investigate
sorry I feel a little brain froze, didn't read your problem fully as you stated it was a power lift gate. my apologies. the problem is in the lift assembly as the struts are just an assist . yes that may have to be replaced . we have the same set up in our larger trucks as well and that's where the problem was the motor would operate to open and close but wouldn't stay in the fully open position. hope this helps.
just wondering if that helped your problem?