9.3

really awful
Typical Repair Cost:
$7,000
Average Mileage:
125,450 miles
Total Complaints:
3 complaints

Most common solutions:

  1. not sure (3 reports)
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problem #3

May 262025

Sierra 1500 Denali 6.2L

  • Automatic transmission
  • 133,250 miles

I paid $35,000 cash for this truck a year ago. A month later, the air went out. Didn't think nothing about it, just maybe needed freon or whatever. Then about 3 months later, it started f*cking up.. jerking hard, wouldn't start, etc. so I had the fuel pump replaced. Then the starter went out, replaced it 4x. Eventually had to buy a new battery. Was good about a month, then right back at the bullshit. Would cut off on me while driving, well, trying to start it back while in neutral, burnt the starter up.. replaced it again. All this is happening with no check engine light ever. I started to think I didn't have one.. ok so after a few times, it started back, smoke coming out the tailpipes like it was on fire. The speed couldn't get no faster than 30 miles an hour. So took it to dealershit, diagnosed with a 7000 dollar list, well all that got replaced. Motor starts knocking and jumping like it's trying to jump out the truck itself. So the oil pump and oil sensor got replaced. Smoking stopped, but only for the engine to squill like a toddler yelling.. load and behold, I get to going down the road and the damn engine just quits on me. I'm stranded in the middle of the road for hours. Still no check like on the dash. Just engine power reduced, and traction control stuck on. Not I'm left with a 35000 yard ornament because I can't get no help and damn sure can't afford another motor.

- Ashley B., Bells, US

problem #2

Jan 032024

Sierra 1500 LTS 5.8L

  • Automatic transmission
  • 149,000 miles

I THINK ITS A SHAME THAT GMC=CHEVROLET OR WHO EVER HAS NOT FIXED THIS PROBLEM. IF I EVER GET OUT FROM UNDER THIS VEHICLE, I WILL NEVER BUY A GMC AGAIN!!!!

- Tony H., Longs, US

problem #1

Oct 182023

Sierra 1500 Denali 5.3L

  • Automatic transmission
  • 94,000 miles

My truck has started making knocking noises as I depressed the accelerator about 3 weeks ago. I thought it was strange because 2018 is a fairly new truck. The first mechanic on a military base could not identify the issue. A second mechanic near my house pulled the valve covers off and identified that 2 of the pushrods were bent and that lifters were failing after the pushrods were replaced. Almost $4,700 in repairs (so far)

- Bilalh K., Crestview, US