2025 Cadillac CT5 Problems: 1 Issues Every Owner Should Know
2025 model year · 0+ owner reports · Updated April 2026
According to Au7o's analysis of 0+ owner reports, the 2025 Cadillac CT5 has 1 documented known issues. No issues are rated critical, indicating generally reliable ownership. Across all issues, repair costs range from $0 to $500. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2020-2025 Cadillac CT5, the CT5 uses GM's 10-speed automatic (10L80) that can exhibit harsh shifts, delayed engagement, and shift hunting, particularly when the adaptive learning resets. The 10-speed has very complex shift logic and can take 500+ miles to fully adapt to a driver's pattern after a battery disconnect, TCM update, or reset. Some CT5 owners report persistent shift quality issues even after adaptation. The CT5-V and CT5-V Blackwing have refined calibrations but can still exhibit occasional harsh shifts.
Common Symptoms
- Harsh 1-2 or 3-4 shifts
- Delayed shift from Park to Drive/Reverse
- Transmission hunting between gears on hills
- Shift quality changes after battery disconnect or service
- Clunky low-speed maneuvers
How to Fix
Have dealer perform latest TCM software calibration - GM releases regular updates. Allow 500+ miles after any reset for the transmission to relearn. For persistent issues, a full transmission fluid exchange with Mobil 1 LV ATF HP can improve shift quality. Very few CT5s require hardware repair.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- NoteGM Special Coverage N242480631 extends warranty to 15 years/150,000 miles for 2020-2021 CT5 10-speed control valve body. Soft metal in valve body causes potential wheel lockup during downshifts. Free repair includes valve body replacement + 9 quarts Dexron ULV. Check eligibility immediately
- Tip10-speed transmission requires 500-1,000 miles of driving after any TCM reset or battery disconnect to complete adaptive relearn cycle. Shift quality will feel rough during this period - this is normal. Do not judge transmission behavior until relearn is complete
- UpgradeMobil 1 LV ATF HP (GM 19417577) machine exchange resolves TCC shudder in 60-70% of cases. Same 10L80 transmission as Escalade/Tahoe/Silverado - same fluid, same flush procedure. Full 17-20 quart machine exchange required for best results (GM #19417577)