2003 Toyota Sequoia NHTSA Investigations
NHTSA Sequoia Defect Investigations
The following investigations on the Toyota Sequoia have been announced by the ODI. Interested in how this information is collected? Read more about investigations by the NHTSA.
Recent 2003 Sequoia Investigations
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ELECTRONIC STABILITY CONTROL Defect Investigation for the 2003 Sequoia
Vehicle Component: Electronic Stability Control*
Summary: On April 28, 2010, Toyota motor North america submitted a defect information report (NHTSA recall no. 10V-176) to NHTSA describing a problem in the vehicle stability control (vsc) system in approximately 50,000 model year (MY) 2003 Toyota sequoia vehicles. According to the report the centering position of the steering angle sensor (SAS) in the MY 2003 vehicles may not be stored correctly due to a logic problem with the skid control computer programming. The vsc system uses the information from the SAS to calculate the driver's intended vehicle direction. This information is cross referenced to sensors that tell the system which direction the vehicle is actually going and the system will, if it determines a variance indicating the vehicle is in a over-steer or under-steer condition, reduce throttle control and apply braking to make a correction in vehicle direction towards what the system believes is the driver's intended path. Toyota dealers will replace the skid control electronic control unit in recalled vehicles. Toyota has indicated to NHTSA that it does not believe that inappropriate activations of the vsc system present an unreasonable risk to safety because it believes the activations are rare and tend to occur at low speeds when the vehicle is fully controllable and that the activations do not last more than a few seconds. Based on interviews with complainants ODI believes that the majority of the inappropriate activations of the vsc system occur when turning at low speeds, such as when a driver is pulling into or across the flow of oncoming traffic. Complainants report the effect produced by the malfunction of the vsc system is to leave the vehicle without the ability to accelerate up to speed, essentially leaving them creeping along exposed to oncoming traffic, because of the brake activation and reduction of throttle control caused by the vsc system. Complainants report that the events can last up to 10 seconds and some complaints report that oncoming traffic had to unexpectedly swerve or severely brake to avoid colliding with the malfunctioning sequoia. During the vsc event the brake lights of the sequoia are not illuminated such that the following traffic is without indication that braking is occurring, nor would the following traffic expect the driver to be applying brakes in such a situation. Several near misses were reported. There were also reports of the vsc system malfunctioning and applying vehicle braking unexpectedly while traveling at highway speeds. Some complainants reported experiencing malfunction activations of the vsc at both low and higher speeds. ODI counted 140 incidents of lower speed inappropriate activations of the vsc system (approximately 10 mph or less - similar to an inappropriate traction control system activation) and 43 incidents of higher speed inappropriate activations of the vsc system (some as high as 60 mph). These numbers include complainants who experienced both types of failures. This investigation is closed based on Toyota's recall.
More Details: For detailed information & supporting documents, see the official NHTSA page concerning investigation #EA09006 »
Status of Investigation: This investigation was closed on May 12 2010 and there was a recall ordered: #10V176000
* This defect investigation is filed under 2 related vehicle components.
ELECTRONIC STABILITY CONTROL AND/OR TRAC Defect Investigation for the 2003 Sequoia
Vehicle Component: Electronic Stability Control
Summary: ODI has received 64 consumer reports and Toyota has received 96 reports that allege incidents of inappropriate activation of either the electronic stability control system [Toyota nomenclature: Vehicle stability control (vsc)] and/or the traction control system in model year (MY) 2003 Toyota sequoia vehicles. During the activation of either system the driver loses throttle control and one or more brakes may apply causing the vehicle to slow suddenly. During these activation events the brake lights are not illuminated to signal to following traffic that the vehicle is slowing. Some of the complainants allege almost being struck by following or crossing traffic because of the unexpected deceleration. In response to ODI's information request letter for PE08-072, Toyota indicated that it has reviewed the reports submitted to ODI and to Toyota and that it believes that there are several issues responsible for the reported incidents. It is Toyota's opinion that the vsc system was operating as designed and that the reports are most likely related to the application of the traction control system rather than the vsc system. At this time Toyota has not determined that a safety-related defect exists in the MY 2003 sequoia vehicles. This preliminary investigation has been upgraded to an engineering analysis (EA09-006) to continue to investigate the scope, frequency, and safety-related consequences of the alleged defect.
More Details: For detailed information & supporting documents, see the official NHTSA page concerning investigation #PE08072 »
Status of Investigation: This investigation was closed on April 15 2009 and no recall was issued.