fairly significant
Typical Repair Cost:
No data
Average Mileage:
500 miles
Total Complaints:
4 complaints

Most Common Solutions:

  1. not sure (4 reports)
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2018 GMC Sierra 1500 transmission problems

transmission problem

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2018 GMC Sierra 1500 Owner Comments

problem #4

Nov 012018

Sierra 1500 SLT 5.3L V8

  • Automatic transmission
  • 150 miles


Buyers beware and stay away from GMC and their $60,000 2018 Sierra 1500 8 SPD automatic transmissions. They have huge manufacture defects and GMC won't fix them. I've had my truck in the shop 3 times since I purchased it new and GMC has said they don't have a solution to fix the problem. But they do and they won't take responsibility for their problems. They don't have issues with the 10 SPD but stay away from the 8SPD. Now I'm considering trading in my Junk Truck and losing thousands of dollars for a defective transmission.

- Kent B., Ogden, UT, US

problem #3

Jul 212018

Sierra 1500 SLT 5.3L

  • Automatic transmission
  • 700 miles

GMC Sierra 1500 SLT, V8. GMC needs to find a solution for the following situation.

Transmission hard shift, at low speed, going 1st to 2nd gear when cold. Now at 7,000 miles still has same problem consistently, disengages and engage very hard. Dealer transmission technician produced a document #16-NA-361 stating not to fix. Condition due to initial clutch fill time (C4) clutch. Latest revision date 5-21-2018.

I find this unacceptable. This is my first and last GM vehicle. I

Too bad, truck has great features, and I really like everything else about the truck.

- planoguy12, Plano, US

problem #2

Aug 052018

Sierra 1500 SLT 5.3L

  • Automatic transmission
  • 500 miles

GMC Sierra 1500 SLT, Really like the truck, specially the gas mileage.

GMC could find a solution for the following situation.

- Front suspension, when you turn to left, makes noise. (problem resolved by the dealer, had to go twice) - transmission hard shift, at low speed, reverse going to 1st gear. now at 17,000 miles started the same hard shift in reverse, disengage and engage very hard. ( Dealer does not have a transmission technician available ) - Engine at 15,000 miles stated to show rattling noise " like if there is loose chain in the engine" (Dealer couldn't identified the noise, keep my truck for 2 days and described a idle noise) - Cooling seats, vibrates at maximum speed. (dealer try to fix, but is back)

I am a contractor, hard to find time to be involved with this situation.

Too bad, truck has great features.

- basesm, Boca Raton, US

problem #1

Jan 012019

Sierra 1500 SLT 5.3L

  • Automatic transmission
  • 500 miles

Just bought new 2018 Sierra 1500 SLT Z71 5.3L crew cab. Have had the 1st to 2nd hard shift at low speed / low acceleration--not every time. Have had hard shift to R--once. Have seen many threads on this issue. Worried. 1,000 +/- miles now. Plan to get "on the record" w/ dealer and GM. LOVE the truck. Not looking forward to a trans issue. Nuts!

- Will C., Baltimore, US

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