Every time the speed of the car reached 33 mph, the vehicle skid control light would start flashing with a continuous beeping sound. When I continued to drive it and took a turn, the car braked and the steering wheel was not responsive. A very dangerous feeling on the windy roads I live on.

- Willits, CA, USA

The contact owns a 2004 Toyota Sienna. While turning the vehicle at various speeds, the electronic stability control light illuminated and the vehicle became very difficult to control. The contact stated that this was a longstanding issue with the vehicle. The vehicle was not diagnosed or repaired. The failure mileage was 100,000.

- Patterson, NJ, USA

This has been happening regularly for at least two years: Traction control seizes control of car when traveling anywhere from 35-65mph, but it happens most frequently on freeway at about 60mph. The car is usually on a gradual curve but it also happens when the vehicle is traveling on a straightaway. Vehicle becomes difficult to control, steer, accelerate, lights on the dash light up and a terrible noise ensues. One independent mechanic and two Toyota dealers have attempted to troubleshoot the problem and have been unsuccessful. When traction control is manually turned off at engine power-on, the lights still light up showing it is attempting to seize control, and in one instance, control was seized despite the system supposedly being shut down. It is terrifying for the driver as well as any passengers.

- San Diego, CA, USA

Purchased 2004 Sienna xle AWD limited 2/18/15. While commuting to work the traction control system randomly activates in dry conditions (usually on downhill angled turn) causing loss of power, activation of front right brakes, and the steering wheel jerked from my hands (resulting in transient overall loss of control of vehicle). This defect has occurred 6 times in 2 days and I am currently afraid to drive the car, especially with a 3 month old. There have been multiple reports on edmunds.com and other Toyota forums that support this is an ongoing problem with this model/year vehicle. This is a safety defect and the vehicle should be recalled to prevent injury or fatality and to resolve the issue with the tcs. There is no way to turn off the tcs manually and this issue can cause an accident.

- Tahoe City, CA, USA

Driving along on 210 freeway East bound in pasadena doing 60, the traction control kicked in, the van braked, and the traction control light on dashboard came on with a beeping sound, and the steering wheel shuttered and car lost power. Lasted about 5 seconds and then back to normal. Could have been rear-ended or could have swerved into other lanes. Also happened on 110 fwy northbound in pasadena, 60 mph, on slight turn, same thing happened, traction control kicked in, the van braked, and the traction control light on dashboard came on with a beeping sound, and the steering wheel shuttered and car lost power. I came close to hitting fwy divider and swerving into car in adjacent lane. Roads were dry and no slippage of wheels felt. Took it to dealer wondries Toyota in alhamba, ca twice and were unable to duplicate.

- Pasadena, CA, USA

Sudden deceleration of vehicle: 2004 Toyota Sienna xle. The vsc engages, without warning, on smooth, dry roads and when cornering or negotiating a curve. We are the original owners and have never experienced this until the first incident in late Oct. 2014. We did not take any action because although road conditions good, we were rounding a sharp bend in the road and assumed this had something to do with the incident. Vehicle speed was approximately 25 mph as the vehicle suddenly decelerated, the vsc light came on and a rapid beeping alarm sounded. The vehicle pulled to one side and steering the vehicle became extremely difficult. The whole incident, start to finish, lasted approximately 5 seconds. The next incident happened in early December 2014. Again, all the above described things happened, except vehicle speed was approximately 35 mph going around a gentle curve in the road. I did some research and found many complaints concerning this issue but do not see any recommendations or recalls officially issued by Toyota. It appears most of the dealer recommended repairs did not correct the problem. Today (December 26, 2014), this same issue happened five times within 40 minutes. My wife managed to get the vehicle home and we called our local Toyota dealer, described the issue and they informed us they have never received any complaints concerning rapid deceleration of this model year, before our phone call. I've scheduled an appointment for December 30, 2014 to have the vehicle checked out and have recall work done concerning the "shift lock solenoid assembly". will update after appointment.

- Hampton Bays, NY, USA

While driving on interstate vsc warning light came on, beeping and alarms heard. Engine slowed down and I felt like the vehicle was out of control. The vehicle swerved like it was hydroplaning on a dry highway. Called our repair shop immediately. Car was towed and research was done on the history of the problem in other Toyota mini vans. I was told there were reports of this happening in other vehicles but not enough for a recall to be issued by Toyota, recommendation by the report they found was to replace a sensor which is what was done. That was just over a month ago and the same problem occurred again tonight on a side road going approx 30 mph on dry road. Van is back at shop again tonight. I will be calling the 1-800 number for Toyota, I do not understand why there is not a recall on this issue. Both incidences could have resulted in an accident. Tonight I was driving with my child in the van. This issue could have placed her life in danger had there been an accident.

- Franklin, TN, USA

In the early summer of 2013, I was traveling North on I-15, approx 5 minutes to St. George, Utah on a beautiful clear day when the car began to swerve and the yellow skid light came on and the emergency beeping sound alarmed and the car slows down on its own--I no longer have control over accelerating the speed of the car. It frightened and alarmed me and my passengers. Within about 5 seconds the light went off and the alarming beeping sound stopped and now I have control of the speed of the car. I have traveled that road several times since and the same incident has occurred at approx the same spot. However, in 2014, during my travels to and fro on this same highway where the speed limit is 65-75mph, the incident occurs in several other spots along I-15 North and southbound. The skid light and the alarming beeping sound even went off when coming to a stop going approx. 5mph. The indicator light and alarm sound seems to be getting more and more sensitive. The same incident has been occurring this year every day on my way home from work at the same spot on I-215. Even though the speed limit is 65mph, I have to slow down to less than 50mph in order to avoid this occurrence. This creates a very hazardous situation since I am slowing down for apparently no reason to the cars behind me who are traveling at the speed limit.

- Henderswon, NV, USA

While driving the vsc activates, the brakes engages, the cars slows down and it make it difficult to control. It has happened to me more than 10 times. Mind you its on a dry surface and no curves. Very scary I drive it with nobody inside just in case... thanks

- Nyack, NY, USA

On clear, dry pavement at moderate (50mph -60 mph) highway speeds, the traction control has unexpectedly engaged. This has occurred multiple times on both slight banking turns and on straight sections of roadway. Previous to each incident the vehicle was under predictable driver control with no sudden steering changes; yet the traction control activated causing sudden braking, difficulty steering, audible alarm sounds, and dashboard traction control light illumination. The vehicle is difficult to control during the 5- 10 second durations. Continued safe driving can only be done by manually disengaging the traction control system. I note that tires were recently replaced and front end wheel alignment was performed.

- Philadelphia, PA, USA

On numerous occasions, (the first incident occurring November 2013 and most recent 6/23/2014), the stability//traction control system suddenly engaged. Most of the incidents occurred while on the freeway with speeds between 50-55 mph, usually on straightaway sections, sometimes during a gentle bank usually toward the right. On all occasions, the roads were dry and the driver was not applying the brakes at the time. Without warning, the brakes suddenly engage causing the van to feel like it was lunging forward and making it difficult to control the vehicle. A series of rapid beeps would occur and the traction sensor would illuminate. The entire episode would last for several seconds. During these episodes, the vehicle is difficult to control and passengers/other drivers are in danger.

- Aiea, HI, USA

Starting from a stop and accelerating up to approx 20 mph, ABS tracs vsc lights illuminated with beeping alert, and activation of brakes causing a sudden deceleration. The road was dry, level pavement, no ice, no gravel, driving straight and the brakes were not being applied. There were no conditions that would necessitate the traction control. As the brakes were not being applied at the time of the incident, the rear brake lights would not have illuminated. Therefore, any driver behind our vehicle would not have been alerted to the sudden deceleration which could have resulted in a collision. Fortunately this was not the case. This is the 2nd time that this issue has occurred with this vehicle. The first was in Nov. 2007 (46000 miles in the vehicle). Toyota service was not able to find a fault, no codes stored and not able to replicate at that time. They said that they would have a corporate contact get in touch with me. I never heard from them. Nothing was resolved. There are at least two tsbs related to the vsc issue (tsb BR004-03 and BR008-04). Neither was implemented.

- Ellicott City, MD, USA

Summary: Sensor in stability control failed and falsely reported crisis situation, causing computer to seize control to slow vehicle and change course. Long version: While driving straight on city street, suddenly vehicle slowed and pulled to side, stability control light and audio alarm activated, heard grinding noise that sounded like ABS. Condition persisted if driving over 5-10 mph. Crawled to nearby non-dealer repair shop. Diagnosis/solution: Steering angle sensor reporting wheels at 250 degrees when actually straight ahead, would not recalibrate, circuit integrity otherwise good, sensor was replaced. No residual problems noted so far since then (one day). I have the failed sensor. This sensor problem was cause of a production change and tsb BR008-04 in the first year. Obviously Toyota has known about this problem for years, but no recall. Other accounts exist on line of people who have had this happen. This is a major safety hazard. It's the mechanical equivalent of riding with a driver on lsd who is braking/swerving to avoid hallucinations. I was lucky to be going slowly on an uncrowded street, but at higher speed or crowded conditions this could be a disaster. Toyota has not been terribly helpful so far, but discussion will continue....

- Madison, WI, USA

The contact owns a 2004 Toyota Sienna. The contact stated that while driving 35 mph, the vsc and the traction off light illuminated causing the brake to engage independently. The vehicle was not taken to the dealer for inspection. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 20,000.

- Torrance, CA, USA

My car is a 2004 Toyota Sienna AWD xle limited. The vehicle will activate the vehicle skid control (vsc) without warning while driving on smooth dry roads. The effect is for the vehicle to apply brakes strongly to specific wheels pulling the car strongly to one side. This happens most frequently while driving winding roads and in corners. It has become more regular it it's occurrence and has happened on relatively straight sections of highway most recently. A similar situation occurred approx 2 years ago. At that time the retailer repaired it by adjusting the steering sensor used by the vsc and stated that this should be done periodically dependent on alignment work done on the vehicle. This solved the issue at that time. It is very dangerous both to the vehicle which requires great effort to maintain control and the vehicles following it which are at risk of rear ending the effected car. The Toyota retailer initially indicated that a catalyst failure was the cause (yes they said this). I was told that the cat failure could induce other brake and engine related failures. The cat was replaced and the vsc failure has resumed. At this time no failures of any kind are indicated. I have researched this topic and find about a dozen identical failures on 2014 Toyota Siennas documented in various user forums. As there are only a few documented on the NHTSA site I am concerned that the situation is under reported. Many of these user forums indicate that the symptoms were reported to the manufacturer. My most recent trouble report case number from Toyota is [xxx]. information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Solvang, CA, USA

Vsc (vehicle stability control) is activated in curves at speeds between 25 mph and 60 mph. Surface is dry and curves are gradual with appropriate and safe driving speeds. The vsc light goes on and warning buzzer goes off. The brakes shudder and the vehicle is de-throttled. Vehicle control is reduced for 3 to 5 seconds and then the vsc deactivates. Concerned that this will be a problem when the road surface is slick. Dealer could not find malfunction codes and could not duplicate problem so no fix. This situation occurs almost every day at least once. Keeping incident log. Web sites indicate this could be steering sensor calibration. Dealer cleaned sensor parts and this did not resolve problem. Contacted Toyota and they said to continue working with the dealer. Tsb is out for yaw sensor failure and steering calibration.

- Fairview, NC, USA

The contact owns a 2004 Toyota Sienna. The contact stated that while driving between 20-30 mph, the traction warning light illuminated as the vehicle began to jerk violently. The contact also stated that the steering wheel would become very hard to steer.the vehicle was taken to an independent mechanic where the failure could not be duplicated. The manufacturer was contacted and no assistance was offered to the contact. The vehicle was not repaired. The failure mileage was unknown and the current mileage was 98,000.

- Tapanga, CA, USA

The vsc has activated multiple times on my van for no apparent reason. While driving at any speed and usually in a turn, the vsc light will flash, the warning beep will beep, and the ABS brakes will automatically be applied and the engine will quickly decelerate. I have almost been rear-ended several times because the van will suddenly decide to decelerate. I have no control over when this happens and no control of the van when it does!

- Glen Allen, VA, USA

As car was being driven in a parking lot the brakes were suddenly applied as the vsc dashboard light was lite. The car vibrated and slowed in a near stop. Brake pedal was nearly useless. The conditions were clear with a dry mostly level pavement. Attempted to drive vehicle about one mile to home not knowing if incident would be repeated. However, it was repeated without warning about every 5 to 10 seconds. Speed never exceeded about 10 miles per hour.

- Broken Arrow, OK, USA

Just over 1 year ago, the vsc warning indicator came on and it was found that one of the steering sensors was bad. I had it replaced. Two days ago, the vsc warning light came on again. From all of the research that I have done, this seems to be a reoccuring problem for Toyota on the Sienna's and sequoia's.

- Okeana, OH, USA