Toyota Sienna owners have reported 1 problem related to assist (under the lane departure category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Toyota Sienna based on all problems reported for the Sienna.
Van has just over 5k miles. Multiple warnings occurred while at speed on a highway. Primary warning was 'low brake power' and braking became extremely touchy as it seemed to utilize the emergency brake as a backup. This extreme braking is hazardous and could result in an accident caused by braking too quickly - with a possible rear-end collision by traffic to the rear. Additional warnings/malfunctions were listed as well, due to the low brake power: lta malfunction (lane keep assist), automatic emergency brake malfunction, parking brake malfunction, check engine. There were no symptoms of poor braking prior to the incident. Dealer filed a tas report with Toyota to address the problem, and was subsequently inspected by the Toyota field representative. Initially could not duplicate/identify the issue and the van was returned. Within one week the incident reoccurred, again on the highway. Van is currently with the dealer and the brake booster and brake master cylinder will be replaced. Expect the dealer will retain the parts.
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all problems of the 2021 Toyota Sienna
🔎.
| Problem Category | Number of Problems |
|---|---|
| Assist problems |