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GMC 1500 AT4 Problems and Issues

Here is the place to discuss any problems or issues with the GMC Sierra 1500 AT4
PNWpineapple
Hot! Door handle unlock button no longer works.
2
Replies
18
Views
100
PNWpineapple
PNWpineapple
B
Hot! Dead Battery. Like Really Dead Battery.
Replies
13
Views
104
pinebaron
pinebaron
S
Hot! Truck won’t go into reverse, high RPM while driving, and “Decreased Speed” warning — anyone experienced this?
Replies
6
Views
66
cynistersix
C
A
Very hard downshifting
Replies
2
Views
152
Haole
Haole
C
AT4 Hose Help
Replies
4
Views
71
R467X
R
sloopdawg
AT4 vs AT4X Issues
2
Replies
20
Views
1K
Bidcaller34
B
TripleB
5,500 miles, in limp mode
2 3
Replies
41
Views
2K
Koolbreezeya
Koolbreezeya
gonzosurf76
Low Oil / Add Oil warning light
Replies
14
Views
18K
sparks602
S
C
2021 5.3L injector failure - 33k miles?
Replies
12
Views
181
R467X
R
T
2026 AT4 Heated seats
Replies
10
Views
270
tim633
tim633
Yeldawb
Exhaust Tips
Replies
8
Views
247
Yeldawb
Yeldawb
B
GMC 1500 3.0 AT4 Battery/Chip Questions
Replies
4
Views
120
Andystoy AT4
A
Azgasser
Factory sway bars/linkages
Replies
3
Views
152
Azgasser
Azgasser
W
P1098
Replies
9
Views
921
tahoetruck
T
Haole
Another leak…
Replies
1
Views
108
pinebaron
pinebaron
C
Squeak coming from front end
2
Replies
27
Views
5K
Woodsy-AT4X
Woodsy-AT4X
K
GM 6.2L oil consumption 2021-2025 AT4 GMC and equal parts in Chevy
2
Replies
25
Views
15K
cfontenot47
C
Dkindschuh
Ambient lighting for center console
Replies
7
Views
1K
gemarsh
gemarsh
E
Clear infotainment errors
Replies
13
Views
369
Ragtop9700
Ragtop9700
20AT421
Issue With Brake Life Monitor?
2
Replies
16
Views
4K
Youngrodder
Youngrodder
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