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2023 GMC Sierra 1500 AT4 — weird vibration only between 62–70 mph

NewCarOwnerCommunity StarterDec 12, 20252023 GMC Sierra 1500 AT4Upstate New York
2023 GMC Sierra 1500 AT4, about 14,500 miles. Car is smooth around town, but on the highway I get a vibration in the steering wheel and seat between about 62 and 70 mph. Above that it actually gets a little better. Tires look okay to me. Where would you start before I start throwing parts at it? Any data points from owners would help.
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EcoDailyCommunity StarterCommunity StarterDec 13, 2025permalink
Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2023 GMC Sierra 1500 is losing coolant with no puddle. Don't erase codes until someone who can help has seen them. On “weird vibration only between 62–70 mph,” that was the fork that mattered for me. This is from a 2023 GMC Sierra 1500 in Upstate New York with 14,500 miles. Not gospel, but it saved me a headache. Not interested in a five-hour wait for a shrug.
TorqueOwnerCommunity StarterCommunity StarterDec 14, 2025permalink
Ask what changed right before it started. Swap the cheap/easy piece first on the 2023 GMC Sierra 1500 and see if the fault moves. Don't erase codes until someone who can help has seen them. Post the numbers (or the code) and people can get more specific. I'll poke at it this weekend.
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