2021 Lexus RX Problems: 1 Issues Every Owner Should Know
2021 model year · 2,400+ owner reports · Updated April 2026
According to Au7o's analysis of 2,400+ owner reports, the 2021 Lexus RX has 1 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is 8-Speed Automatic Transmission Shudder with 2,400 owner reports. Across all issues, repair costs range from $200 to $3,000. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2016-2022 Lexus RX 3.5L 2GR-FKS, the Aisin 8-speed automatic in the fourth-generation RX develops a noticeable shudder or vibration during light throttle acceleration, particularly in the 25-45 MPH range during torque converter lockup. The shudder is caused by torque converter clutch material wearing into the transmission fluid, degrading its friction properties.
Common Symptoms
- Vibration or shudder at 25-45 MPH
- Shudder during light acceleration
- Feeling like driving over rumble strips
- Vibration disappears under heavy throttle or braking
How to Fix
Perform a transmission fluid drain-and-fill with Toyota WS ATF, which resolves the shudder in most cases. Severe cases may require a torque converter replacement. Do not flush — only drain and refill. Plan to change the fluid every 30,000-40,000 miles despite the "lifetime" fluid claim.
What Owners Are Using
Parts and tips from 2,400+ owners who fixed this issue
- TipA simple drain-and-fill of Toyota WS ATF fixes the shudder in 90% of cases. Do 2-3 drain-and-fill cycles over 10,000 miles to fully flush the old contaminated fluid.