wont accelerate past 4000 rpm

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! If your 2011 Sienna won’t rev past 4,000 RPM, it could be a transmission issue, but let's look deeper. Some Toyotas have an RPM limiter in neutral or park as a safety feature, but if this is happening while driving, it could also point to issues with the throttle body, MAF sensor, or even a clogged catalytic converter. These components restrict performance without throwing obvious codes sometimes, so it’s worth checking them out before going for a costly transmission repair. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.