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10.0

really awful
Crashes / Fires:
1 / 1
Injuries / Deaths:
1 / 0
Average Mileage:
4,900 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2021 Toyota Sienna electrical problems

electrical problem

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2021 Toyota Sienna Owner Comments

problem #10

Dec 082023

Sienna

  • miles

A D V E R T I S E M E N T S

1. The vehicle displayed the Rear Cross Traffic Alert (RCTA) warning light along with the Blind Spot Monitoring (BSM) warning light on the dash board. The vehicle was brought to Toyota of Ann Arbor for an inspection. After inspecting the vehicle, Toyota of Ann Arbor reported that road debris (snow, dirt, mud, etc.) was trapped between the bumper and the sensor resulting in the sensor to malfunction. The vehicle has been taken through a car wash with an underbody wash option, but due to the position of the sensor, the sensor is not able to be cleaned from a car wash. The sensor can only be cleaned by removing the bumper. But when the bumper is removed, the sensors have to be re-calibrated and the re-calibration of the sensors can only be completed by trained professionals. 2. Due to the malfunctioning sensor, the driver's safety is put at risk by not being alerted of obstructions (both objects or persons) behind the vehicle, nor oncoming cross traffic, nor detecting vehicles in blind spots. This could cause collisions or worse, fatality, due to the malfunction sensor not alerting the driver. 3. This vehicle has been able to reproduced the problem multiple times and as mentioned above, the vehicle was inspected and confirmed by the Toyota of Ann Arbor dealership. The dealership (Toyota of Ann Arbor) mentioned that there are multiple reports of this issue on other vehicles of the same make and model. 4. The vehicle or component has not been inspected by the manufacturer, police, insurance representative, or others. 5. No prior symptoms were seen or displayed prior to the failure.

- Fowlerville, MI, USA

problem #9

Jun 022023

Sienna

  • miles
The breaks give out to a point where you run the risk of running into someone or something. We've visited Toyota 3 times now complaining of this issue yet they just state it's the regenerative breaks and how they operate. Although the breaking never got to this level of safety concern until we reached around 30,000 miles. I filed a complaint with Toyota that resulted in nothing being done. A couple examples would be sitting at a stop light and the breaks release almost causing us to run into the car in front of us. Pulling into daycare trying to stop while pulling into the parking spot and the breaks release. The last one is while going down hills the breaks seem to let go and the vehicle speeds up. It scared my wife so much that we actually sold the vehicle as Toyota deemed it safe. We loved the vehicle but can't risk the safety of our family.

- Covington, KY, USA

problem #8

Jul 032023

Sienna

  • 49,000 miles
The contact owns a 2021 Toyota Sienna. The contact stated that while his wife was fueling the vehicle, his 5-year-old son pressed the automatic rear driver's side sliding door switch and the door opened, bumped, and scraped the fuel door. The contact's wife immediately stopped fueling the vehicle. The contact stated that the vehicle was designed with an automatic door lock that should engage to prevent the rear driver's side sliding door from opening and bumping into the fuel door while fueling the vehicle; however, the automatic door lock failed to engage. The contact stated that he was concerned that the failure had caused metal fragments intrusion in the fuel tank. The vehicle was taken to the dealer, where the cause for the failure could not be determined. The vehicle was not diagnosed nor repaired. The manufacturer was notified of the failure and referred the contact to the dealer for assistance. The failure mileage was approximately 49,000.

- Holland, NY, USA

problem #7

Feb 162023

Sienna

  • miles

A D V E R T I S E M E N T S

After being parked for 4 hours the vehicle caught on fire. Burnt passengers rear corner and rear tailgate

- Lima, OH, USA

problem #6

Dec 242022

Sienna

  • miles
I would like to make formal complaint in regards to a manufacture defect. I purchased my Toyota Sienna XSE brand new in August of 2021 at Cerritos Toyota in California. On December 24th at approximately 1:30 p.m. on Christmas eve, after filling up gas at Sam's club in Fountain Valley, CA. I pull out on to the street heading northbound on Warner approaching intersection as I come to complete stop on red. All of a sudden, my Sienna completely shut itself off and the engine light came on. I put it back on park and restart the car. As I attempt to accelerate forward. The car jerk and the brake didn't work and the engine light came on. Fortunately, I was able to make a U turn and pull into a gas station near by ( Shell) and I thank the lord almighty there was no car right behind me. I could of gotten rear ended. It was the most terrifying moment of my life. My wife and I was in the car at the time of the incident. We waited patiently over an hour for Triple AAA to have it tow the nearest dealership next to my house in Long Beach, CA. My 2021 Toyota Sienna currently has 52,023 miles and sitting at the dealership to be repair at Long Beach West Coast Toyota. I have contacted Toyota of this incident and they refused to fully covered repair instead they offered me 700 payment assistant the rest would come out of my pockets. I believed the car should be part of the campaign recall and nothing should come out my expense. I would like you you guys to investigate the incident and look into this matter as soon as possible because there thousands like my mind that could there have the same issue but was not part the campaign recall. A bulletin was published on April 13, 2022 affecting 2021 -2022 Toyota Sienna. Production Period March 3rd, 2020 through April 7th 2022. Manufacture's Campaign Number: Toyota: 22TB03

- Long Beach, CA, USA

problem #5

Dec 032022

Sienna

  • miles
The vehicle gets a jolt of power or speed while braking slowly or coming to a stop. This could result into an accident. This was addressed to multiple Toyota dealers and the problem was unidentified or undetectable to the technician multiple times. The problem is reported by several Sienna forum users but it is not being fixed by Toyota dealers.

- Coppell, TX, USA

problem #4

Oct 042022

Sienna

  • miles

A D V E R T I S E M E N T S

My car became inoperable because Hybrid/EV Battery Voltage System Isolation Fault:Internal electronic failure.Code P0AA6-49..Well known problem to Toyota about corrosive electrical connections(cables)..which needs to be replaced under Hybrid system warranties..but dealership and Toyota refusing to replace it under warranties..even they know some owners started class action against Toyota

- New York, NY, USA

problem #3

Sep 012022

Sienna

  • miles
The navigation/touch screen has turned off and on during driving. The navigation, audio system, backup camera view were unable to be used. The next available appointment is on September 15th, 2022 and it has not been inspected by anyone. There were no warning signs prior to the incidents.

- Leander, TX, USA

problem #2

May 182022

Sienna

  • miles
I went on a trip to Missouri to visit my son and family. When going through St. Louis on 5/18/2022 I ran through a thunderstorm with a lot of rain. After I stopped, I noticed a puddle of water between the front seats. I could not find out where it came from. Later that same day I went through another storm. Again I found a puddle of water between the seats. This is a vehicle that was modified by VMI into a handicapped accessible van. Water coming in is concerning due to all the electrical components that could be shorted out. I don't want to find out later that there is rust damage nor damage to the electrical systems because of water entering the vehicle.

- North Canton, OH, USA

problem #1

Jul 242021

Sienna

  • miles
We were driving down the freeway when we got rear ended hard by a large pickup. Then we lost electrical and engine power. The brakes stopped working. The hazard lights stopped working. Luckily we were able to coast to a complete stop as there was no way to stop the car. The police came and took a report. Then the car was towed to a body shop. We're awaiting the insurance company adjuster for inspection.

- Palos Verdes Estates, CA, USA

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