This page covers 1 recall and 25 owner complaints for the 2023 GMC Sierra 3500.
Powertrain complaints dominate what owners report for the 2023 GMC Sierra 3500, making up the bulk of the filed complaints. The most consistent pattern involves the transmission, specifically the valve body. Owners describe experiencing sudden hard shifts, typically at highway speeds, followed by the transmission dropping into limp mode and the truck becoming undrivable. Several owners report being stranded as a result. The truck throwing codes pointing to valve body failure appears across multiple accounts, and at least one owner reports the failure occurring around 23,000 miles. A separate but related symptom some owners mention is a reduced power warning appearing on the dash before the vehicle shuts down on the highway. Lane departure and electrical complaints each account for a small number of reports, with no strong recurring pattern in those categories. The valve body and transmission limp mode combination is the clearest repeating complaint across this model year.
25
Total Complaints
4
Crash-Related
1
With Injuries
By System
At a glance
What can fail
Water can get inside the tailgate's electronic release switch and cause it to short circuit, making the tailgate unlatch on its own while parked.
What the fix does
Dealers will replace the exterior touchpad switch assembly at no cost to fix the electrical short and prevent unintended unlatching.
Summarized — see the official notice for exact wording, dates, and contacts.
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Complaints are owner-reported and reflect individual experiences, not confirmed defects. They are distinct from recalls. Data sourced from the national vehicle safety complaint database. See trending complaints →
