Two problems related to noises during shifting have been reported for the 2018 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 GMC Sierra 1500 based on all problems reported for the 2018 Sierra 1500.
A/c stops working 2. ) mechanic does vacuum test and replaces refrigerant ($200) freon 3. ) a/c is blowing hot air again after 3 days; refrigerant completely gone 4. ) mechanic runs dye through lines to find the leak, replaces refrigerant again and states the problem is compressor failure ($200) again 5. ) the overall fix would be to replace the compressor ($1,000) but there are no compressors to be found, the part is on national backorder because of the widespread problem. " left side of wheel making aloud noise when backup , it is a know problem with the steering rack tansmission downshift from 30-15 make a push effect and couching noise.
I have been noticing a shudder and hard shifting intermittently when driving about 30-60mph and I took it into the shop they said they can not duplicat the issues so I take it back and it started doing it more. I took the truck back to the shop again and yet again they told me they can not duplicate the issue. No here I am at 17k miles on is still doing it and shiftting hard and now there is a knocking noise. I talked to the dealer ship and they said its under warrany still just drive it tell it get worse.