2014 Lexus IS Problems: 1 Issues Every Owner Should Know
2014 model year · 2,100+ owner reports · Updated April 2026
According to Au7o's analysis of 2,100+ owner reports, the 2014 Lexus IS has 1 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is 8-Speed Automatic Harsh Shifting with 2,100 owner reports. Across all issues, repair costs range from $0 to $0. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2014-2020 Lexus IS, the Aisin 8-speed automatic transmission in the third-generation IS exhibits harsh or jerky shifts, particularly during low-speed 1-2 and 2-3 upshifts and when downshifting for deceleration. The transmission control module programming prioritizes fuel economy over smoothness, leading to abrupt gear changes that are felt prominently in the cabin.
Common Symptoms
- Hard jerk during 1-2 upshift at low speed
- Harsh downshift when decelerating
- Clunking sensation during gear changes
- Transmission hesitation when accelerating from a stop
How to Fix
Visit the dealer for a transmission ECU reprogramming that smooths shift points and torque converter lockup behavior. Perform a transmission fluid drain-and-fill with Toyota WS fluid every 40,000 miles. If harsh shifting persists after the reflash, the valve body may need replacement.
What Owners Are Using
Parts and tips from 2,100+ owners who fixed this issue
- TipA fluid drain-and-fill with genuine Toyota WS ATF makes a noticeable difference in shift quality. Do not flush — just drain and refill 4-5 quarts.