2020 GMC Yukon — delayed engagement into Drive when cold
This started as a small annoyance and I finally decided to track it down. After sitting overnight, shifting from Park to Drive can take a second or two before…
GMC discussions
2023 GMC Sierra 1500 AT4 — physical buttons are disappearing again — good or bad?
Automakers keep moving basic controls between touchscreens and physical buttons depending on the generation. What controls do you absolutely want to remain phy…
2023 GMC Sierra 1500 — surface rust underneath a winter daily
2023 GMC Sierra 1500 AT4, about 67,000 miles. There is early surface rust on brackets, fasteners and seams underneath, but nothing structural. For a salt-belt…
2023 GMC Sierra 1500 AT4 — intermittent metallic rattle after cold start
For the first few seconds after a cold start I hear a metallic rattle, then it disappears and won't come back once the engine is warm. No warning lights and it…
2020 GMC Yukon — footwell gets wet only after heavy rain
2020 GMC Yukon Denali, about 60,000 miles. The car stays dry in normal rain but after a long storm one front footwell gets damp. Door seal looks okay. What dra…
2023 GMC Sierra 1500 — 50,000-mile ownership report: what actually broke? — anyone dealt with this recently?
2023 GMC Sierra 1500 AT4, about 28,000 miles. I just crossed 50k miles and want to log maintenance, unscheduled repairs, tire life, fuel economy, dealer visits…
2020 GMC Yukon — service lifetime transmission fluid or leave it alone?
2020 GMC Yukon Denali, about 104,000 miles. The manual treats the fluid as lifetime under normal conditions, but the vehicle is getting older and I plan to kee…
2023 GMC Sierra 1500 — catalyst efficiency code but car drives normally
2023 GMC Sierra 1500 AT4, about 39,500 miles. A catalyst efficiency code came back after clearing once. The car drives normally and there are no misfire codes.…
2020 GMC Yukon — no crank with full dash power, then it starts later
This started as a small annoyance and I finally decided to track it down. Twice I have had full lights and accessories but no crank. After waiting a few minute…
Question: Payload sticker changed my whole truck-shopping plan
I was focused on tow rating until I started adding passengers, gear and tongue weight. Now payload looks like the real limit. How much buffer do you personally…
FlatSixEnthusiast5Community StarterAug 21, 20262023 GMC Sierra 1500 AT4South Florida3 replies0 helpful
Transmission temperature climbs on long grades
Normal temperatures around town, but towing uphill for 20–30 minutes pushes trans temp much higher. How do you decide whether the solution is speed/gear select…
QuattroNerdCommunity StarterAug 21, 20262023 GMC Sierra 1500 AT4Denver / Front Range5 replies0 helpful
2020 GMC Yukon — is this actually a good used-car deal?
2020 GMC Yukon Denali, about 78,000 miles. The online price looks competitive, but I am trying to judge the entire deal rather than the headline number. What s…
Need advice: Shudder at light throttle around 40 mph
I get a light shudder at steady throttle around 35–45 mph. If I accelerate harder or lift off, it goes away. Trying to figure out whether this sounds more like…
TireDriverCommunity StarterJul 14, 20262023 GMC Sierra 1500 AT4Boston / New England0 replies0 helpful
Anyone else: No crank, lights work, then it suddenly starts
2023 GMC Sierra 1500 AT4, about 151,000 miles. Twice this month I turned the key/button and got lights but no crank. After trying again a few minutes later it…
2020 GMC Yukon — clunk when changing from reverse to drive — anyone dealt with this recently?
2020 GMC Yukon Denali, about 29,500 miles. There is a single clunk when changing direction at low speed, especially reverse to drive. No vibration while cruisi…
2023 GMC Sierra 1500 — dealer lowered price but added accessories back in
2023 GMC Sierra 1500 AT4, about 38,500 miles. We agreed on a vehicle price, then the worksheet included dealer-installed products I did not ask for. The total…
2020 GMC Yukon — rear end still feels floaty after new shocks
Shocks were replaced and there are no obvious loose parts, but the rear still feels vague over highway undulations. What alignment, bushing, tire or installati…
2023 GMC Sierra 1500 — open carrier or enclosed for a normal enthusiast car?
2023 GMC Sierra 1500 AT4, about 66,000 miles. The car is valuable to me but not exotic. Enclosed transport costs noticeably more. When is the extra protection…
2023 GMC Sierra 1500 — battery dies after the car sits for a weekend
Battery passes a quick test and charging voltage looks normal, but after two or three days parked the car sometimes will not crank. What is the cleanest parasi…
LongMilesDriver187Community StarterAug 9, 20262023 GMC Sierra 1500 AT4Salt Lake City0 replies0 helpful
2023 GMC Sierra 1500 — is this actually a good used-car deal?
The online price looks competitive, but I am trying to judge the entire deal rather than the headline number. What should I compare besides mileage, history, c…