The trac control is activated while the car is driving variable speed and brake the car and and the driver loose control of acceleration.

- Saratoga Springs, UT, USA

The slip indicator light and alarm comes on sporadically, engaging the ABS suddenly and unexpectedly, when we are on completely dry roads. Happens while driving 40-80 mph. And doesn-??t matter if I-??m going straight or turning.

- Huron, SD, USA

- Traction control engaged at high speed(70 mph on interstate) causing the vehicle to brake abruptly and pull the vehicle to the right. Had I been traveling in the left hand lane, I could have been forced into the right hand lane causing a collusion with another vehicle. Also occurred at lower speed(30 mph on a windy road) causing the same issue as described above, almost causing the vehicle to leave the paved surface. - Mechanic was able to duplicate the issue - Mechanic diagnosed intermittent traction control activation, scanned computer for codes. Yaw rate/steering angle correlation causing false activation ABS/traction. Replaced hub bearing and spindle. Four wheel alignment, including check castor, camber and adjust toe. Performed zero point calibration and reset ABS memory. - Traction control lights up briefly

- Fletcher, NC, USA

About a year ago the Vehicle Stability Control warning light along with an audible alarm started coming on intermittently while turning on highways going uphill or downhill in dry weather and with no risk of any tire slipping. At first this only happened at higher speeds 65+mph. Over time, it has occurred more and more frequently and can occur at speeds down to 25 mph. At times, the Anti-lock Braking System is also activated resulting in jerky braking and loss of throttle. When people have been following me too closely, this has almost caused accidents. When these symptoms occur, it is always on a curve (of any degree, even slight curves) and while driving at least 25 mph, and even happens on flat turns now. The weather has always been dry with no risk of tire slippage.

- Simi Valley, CA, USA

Sometimes when I take turns in my Sienna, the VSC starts going off and braking individual wheels without my control. This happens unexpectedly on highway bends at speeds of 60+ mph and it is difficult to control the car and keep from swerving into another lane. If the roads were icy when this happens, it would probably cause a dangerous accident. Toyota has a technical service bulletin for this, but not a recall - which it should since this is a significant safety issue. The TSB is BR008-04. There are many others experiencing this same issue: https://forums.edmunds.com/discussion/13855/toyota/sienna/vsc-sudden-activation-2004-toyota-sienna

- Lakewood, CO, USA

While driving on dry freeway or other stable road conditions, the Electronic Stability Control kicks in, braked hard, causing the van to swerve, and the lights on the dash started flashing, accompanied by a loud beeping. This has happened multiple times now. There is no reason for this to be occurring. It is involuntary, sudden, and random. If someone were close behind me, they could rear-end the vehicle. It also sometimes pulls the steering so hard that it swerves into the other lane. This is a serious safety issue that Toyota needs to deal with.

- Pullman, WA, USA

Unknown

- Bakersfield, CA, USA

Numerous times (too many to say), the traction control indicator sensor comes on & I am unable to control the car. Typically it lasts for 2-3 minutes and turns off. It does not depend on road conditions, weather, and or speed. I have taken the car to the repair shop and they have not been able to capture anything on the engine diagnostic system. No codes were found for them to troubleshoot this issue. I've seen this problem being reported on several posts. Yet the NHSTA has done NOTHING!! TOYOTA NEEDS TO BE HELD LIABLE FOR THIS ISSUE. WAKE UP NHSTA. MAKE OUR TAX DOLLARS WORK!!! This poses a huge risk to my family and other drivers, not to mention impact on budget.

- Hockessin, DE, USA

ABS some times activates when driving a light curve road at speed around 30-40 mph. Usually a steering wheel is about 2 or 10 O'clock positions. At the time vsc indicator flashes and warning alarm goes off. This causes a sudden breaking and it becomes very difficult to control the car.

- Lawrenceville, GA, USA

The vsc system is enabling while driving and making a turn on an otherwise normal road. When it enables, it applies the brake and sounds a repeating alarm. The system applies the brake while I am attempting to make a turn, and this makes me feel unsafe, as if I have temporarily lost control of the vehicle while making an otherwise benign maneuver. The repeating alarm does not turn off until I have turned the wheel to the opposite direction from the initial turn angle. This means if the turn is slow, the alarm will sound for the entire distance of the turn.

- Stillwater, OK, USA

In motion, on dry, off-camber highway curves, with slight acceleration, the ABS/vsc /trak engages, briefly jerking the steering to one side. Dash warnings: "vsc" "trak off" + "check engine". reducing mechanical "slop" (wheel bearings, steering rack & pinion, etc.) tends to reduce frequency of occurrence. Toyota dealer diagnosis: "steering control system fault". >"Toyota knows about -- but, does not know how to fix this problem."< dealer-suggested workaround: "pull fuzes to disable vsc and ABS systems..." dealer repair documents are with previous owner...

- Bivins, TX, USA

We bought this car about 1 1/2 years ago. After having it for a bit we learned of the problem. You will be driving down the road (dry, sunny day) and all of a sudden the car will start beeping, the traction control will kick in and start pressure braking the car. The car thinks it pulling you out of a skid, so you have to strongly hold the steering wheel. It's terrifying! I feel like the car is going to pull me off the road. I won't drive the car in rain because of this and honestly don't feel comfortable even driving it most the time. You never know when it is going to happen and it typically happens while you are driving high speeds on the highway. This is a known problem with Toyota - they have a technical service bulletin BR008-04 (ABS& traction control intermediate vsc system), which shows they have replaced the defective part. However since the car is old, they won't replace it anymore. It is the companies defect part! how many people have gotten into accidents and/ or died from this" and just to say it - the 2004 version doesn't have a way to manually just turn off the traction control. We have tried everything! I took it to a Toyota dealership and they agreed this is what is wrong with the car, but said they won't fix it for free - they wanted $800. I contacted Toyota customer and they basically told me they don't care if people die from this, because the car is old and they don't have any responsibility after a certain age of the car. We have 3 kids and this is not an acceptable answer! my whole family has Toyota vehicles and if they don't make things like this right, we will not be anymore! the car is new to us and is frankly unsafe. This is Toyota's faulty part. I have seen several message boards with the same issue. How can a deadly issue expire"

- Bedford, NH, USA

Driving at 50 mph on a two lane highway the car suddenly veered to the right and decelerated/braked hard, under it's own control, not mine.

- Eugene, OR, USA

When driving in dry conditions at various speeds over 25 mph, the vsc warning light comes on, an alarm sounds and the antilock brakes engage for no reason. This is a terrifying and extremely dangerous issue that is well documented by so many Toyota Sienna owners but to date has not been addressed or acknowledged by Toyota. When taken to a dealership, they claim (as other owners have also stated) that they cannot replicate the problem and it does not register through the obd2 sensor so there is no record of it happening. With as many people as this is happening with, it is not a question of whether there will be accidents, injuries and ultimately deaths caused by this issue. The only question is when and how many have to occur before Toyota acknowledges this is a problem. Driving down the road, in traffic at 65 miles an hour when for no reason, the car slams on the brakes without warning. It is happening all the time at this point making the car completely unsafe to drive for the owner, the vehicle's occupants and any unsuspecting vehicle in the vicinity. I am begging you. Please get Toyota to issue a recall before tragedy strikes. Thank you for your prompt attention to this matter. I am submitting the date below as today's date as the car is now sitting in my driveway until I can figure out what needs to be done. It has happened over the past 6 months every time I drive it and the $750 steering position sensor that Toyota replaced did nothing to address the problem.

- Summit, NJ, USA

While my vehicle is in motion on city streets and highways at speeds between 35 and 55 mph, on a straightaway and curve, the stability control light/and alarm comes on randomly. Sometimes it's just the alarm that sounds, and sometimes the alarm sounds and the brakes activate and the minivan swerves. Was the most frightening and dangerous experience ever with my young grandchildren riding with me. I actually had to pull over to the side of the road to calm myself. This has now happened on several occasions with today (7-24-19) being the latest experience.

- Antelope, CA, USA

Steering problem sometime it's hard to steer it's dragging it's too dangerous.I almost got an accident because the steering didn't react when I'm changing lanes

- Las Vegas, NV, USA

When on a curve the traction control engages affecting the brakes and steering of the vehicle. Speed does not seem to matter, it has engaged at 10mph and at 65 mph. Last straw was when it engaged on the straight away on the highway at 65mph in the high speed lane dropping the speed down to 35mph almost causing a serious accident. It's been happening for a couple of months and two independent mechanics were not able to figure out the problem even after running a moving vehicle diagnostic. It went off a total of 18 times in a aproximate 15 minute, three mile drive with the mechanic. After watching many videos, and complaints online, why hasn't something been done on this issue that has been going on for over eight years now? I'm afraid to take this vehicle on the highway anymore!!!

- Fairhaven, MA, USA

The vsc is going off randomly, in dry, safe conditions. Almost always when I am turning to the left in a long turn. But has also happened on a windy road, driving 15mph or less, on ever single turn sometimes just the alarm, light flashing on dash & engine dethrottling, other times add the steering wheel pulling & brakes pumping themselves. We have had it in 3 different shops & the computer detects no codes, all parts in question (suspension, yaw, rotational position sensor, etc) are in good working order, nothing loose, worn or otherwise not functioning properly. We have had the yaw sensor replaced after reading many other reports of this issue, but it didn't help. We love our van, but it is now a death box. We never know when the vsc malfunction will activate, making the car unsafe to drive. When will Toyota acknowledge this & help owners?

- Orangevale, CA, USA

Traction control malfunction. While driving on curvy roads there is a beeping alarm, steering locks up, brakes engage. The car seems to think that the traction is off. This has been a problem for over a year. No problems driving in city. Only happens on curvy roads.

- Seattle, WA, USA

When traveling at highway speeds and usually on a slight curve to the right, the traction control alarm and breaks go off causing the van to jerk and shake. We have been told this might be low tire pressure but the tires are fine. We have had an alignment, new tires this problem happens randomly and we have not been able to reproduce it for the mechanic. We have been dealing with this for a couple of years maybe happening 20 times. I feel it is just not safe enough to drive or pass this problem on to someone else. I wouldn't want the car on the road with me either I have read online of other Toyota Sienna's with the same exact problem. This is not isolated and is a safety concern.

- Elizabeth, CO, USA