2024 GMC Acadia Problems: 1 Issues Every Owner Should Know
2024 model year · 560+ owner reports · Updated April 2026
According to Au7o's analysis of 560+ owner reports, the 2024 GMC Acadia has 1 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is 9T65 9-Speed Transmission Harsh Shifts and Hesitation with 560 owner reports. Across all issues, repair costs range from $0 to $3,500. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2017-2025 GMC Acadia, the second-generation Acadia (2017+) uses the GM 9T65 9-speed automatic transmission which shares known issues with the Chevrolet Traverse and Blazer. Common complaints include harsh 1-2 upshifts, hesitation between 5-15 mph, lurching on light throttle in stop-and-go traffic, and the transmission hunting between gears on hills. GM has released multiple TCM calibration updates. The transmission is extremely sensitive to fluid condition — extended intervals with aging Dexron HP fluid contribute significantly to shift quality degradation.
Common Symptoms
- Harsh or jerky 1-2 upshift between 5-15 mph
- Hesitation when pulling away from a stop
- Transmission hunting between gears on slight grades
- Vibration or shudder during light acceleration
- Delayed engagement from Park to Drive
- Slip or flare on 2-3 shift under load
How to Fix
TCM recalibration with latest software (multiple revisions released). Full transmission fluid exchange with Dexron HP (ACDelco/GM 19354121) every 45,000 miles. Valve body and solenoid pack replacement (OEM 24043134) if software updates fail. Allow 500+ miles for relearn after any TCM reset.
What Owners Are Using
Parts and tips from 560+ owners who fixed this issue
- TipTSB 20-NA-136 covers 9T65 harsh 1-2 shift on 2017-2021 Acadia. The first authorized repair step is a TCM calibration update via GDS2 — free under warranty and typically $100-150 at a dealer out of warranty. GM has released multiple calibration revisions; ask the dealer to confirm they are installing the most current software version, not just any available update. Calibration alone resolves ~65% of 9T65 shift complaints.
- UpgradeACDelco/GM Dexron HP ATF (GM part 19354121) for 9T65 transmission — change every 45,000 miles despite the 'lifetime' fill designation. Dexron HP degrades significantly in stop-and-go use and extended intervals are a major contributor to 9T65 shift complaints. Pan-drop fluid change requires a 6mm hex drain plug tool; 9T65 has no traditional drain plug. A full exchange via cooler line requires approximately 9-10 quarts. (ACDelco #19354121)
- NoteIf 2017+ Acadia suddenly loses reverse or a forward gear, stop driving immediately — this indicates a missing check ball or solenoid failure within the valve body that causes hydraulic circuit loss. Continued driving rapidly destroys clutch packs. Report sudden gear loss to GM Customer Care (1-800-462-8782) and request escalation to field engineer review; documented repeat failures have received goodwill powertrain repairs on out-of-warranty vehicles.