NHTSA Complaint #11674265 — 2021 TOYOTA redundant SIENNA

SERVICE BRAKES issue reported to NHTSA

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Complaint Details

ODI Number	11674265
Vehicle	2021 TOYOTA redundant SIENNA
Component	SERVICE BRAKES
Date of Incident	July 12, 2025
Date Filed	July 17, 2025
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	MI

Consumer Description

Brake Transition Issues: I have noted frequent jolts of power when braking, which creates at least the sensation of, if not actual acceleration while breaking. Web research suggests this may be linked to the vehicle switching between regenerative and mechanical braking systems, and that the problem is acute with 2021 and 2022 Toyota Siennas, which, if accurate, means Toyota has applied a fix to subsequent model years, but has not systematically addressed the first two years of the current Sienna generation.

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