NHTSA ID Number: 11045188
Incident Date: 2017-10-18
Manufacturer's Name: Toyota
Motor Corporation
Vehicle/Equipment Make: TOYOTA
Vehicle/Equipment Model: SIENNA
Model Year: 2005
9999 If Unknown Or N/A
Vehicle Identification Number: 5TDZA23CX5S
Vehicle Mileage At Failure: 137000
Vehicle Speed: 42
Number Of Occurrences:
Was Vehicle Towed: No
Consumer Location: CHARLOTTESVILLE, VA
Summary of Complaint
TWO INSTANCES IN OCT 2017 OF BRAKES ACTIVATING WITHOUT DRIVER ACTION. BRAKING ACCOMPANIED BY BEEPING - POSSIBLY ELECTRONIC STABILITY CONTROL (ESC) ACTIVATION SIGNAL. BRAKING REDUCED SPEED APPROXIMATELY 10-15MPH. BOTH INSTANCES OCCURRED ON THE SAME ROAD, A CURVY 45MPH LIMIT ASPHALT 2-LANE. CONDITIONS DRY, ~50 DEG F. BRAKING OCCURRED ON A STRAIGHT SECTION AND DID NOT PULL THE CAR TO ONE SIDE. DO NOT BELIEVE ANTI-LOCK ENGAGED. VAN HAS 137K MILES.TOYOTA SERVICE (11/9/17) : "NO PROBLEMS FOUND NO CODES STORED NO VEHICLE EVENT LOG (VEHICLE DOES NOT HAVE THAT CAPABILITY) MORE OBVIOUS AND LIKELY CAUSE COULD HAVE BEEN THE FACT THAT THE FRONT TIRES WERE AT 20 PSI AND THE REAR AT 35 PSI, THE DISPARITY IN WHEEL SPEED SIGNALS COULD HAVE TRIGGERED A FALSE EVENT." VERBAL REPORT CONFIRMED "NO PROBLEMS FOUND" INCLUDING STEERING RACK BUSHINGS, STEERING ANGLE SENSOR, AND WHEEL SPEED SENSORS. THE SERVICE REPRESENTATIVE, WITH 6 YEARS EXPERIENCE AS A MECHANIC, SAID HE HAD ENCOUNTERED THIS PROBLEM BEFORE BUT IT WAS RARE. HE ALSO STATED THAT AN APPARENT DIFFERENCE OF ONLY 1MPH IN WHEEL SPEED COULD BE ENOUGH TO CAUSE INADVERTENT ESC ACTIVATION. HOWEVER, HE WAS UNSURE WHY THE PROBLEM, IF IT WAS CAUSED BY THE FORE/AFT INFLATION DIFFERENCE, WAS SO INTERMITTENT. THE DEALER WAIVED THE $98 DIAGNOSTIC FEE. A DRIVE ON THE SAME ROAD ON 11/10/17 DID NOT PRODUCE THE UNEXPECTED BRAKING, BUT IT IS UNCLEAR WHETHER THIS MEANS THE EQUAL TIRE INFLATION FIXED THE PROBLEM AS, AS STATED, THE PROBLEM WAS INTERMITTENT. SYSTEMS DESIGNED TO IMPROVE SAFETY SHOULD FAIL IN WAYS THAT DO NOT COMPROMISE DRIVER CONTROL AND OWNERS SHOULD BE MADE AWARE OF CRITICAL MAINTENANCE PROCEDURES TO AVOID SUCH FAILURES. FAILURE OF ACTIVE SAFETY SYSTEMS SUCH AS ESC, RISKS DELAYING ACCEPTANCE OF INCREASING LEVELS OF DRIVER ASSISTANCE INCLUDING FULL AUTONOMOUS CONTROL, AN ADVANCE THAT PROMISES DRAMATIC REDUCTION IN ROAD MORTALITY.
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Complaint 11045188 Documents
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CRASH: No
WAS VEHICLE INVOLVED IN A CRASH
FIRE: No
WAS VEHICLE INVOLVED IN A FIRE
INJURIES: 0
NUMBER OF PERSONS INJURED
DEATHS: 0
NUMBER OF FATALITIES
Was Medical Attention Required: No
Was Incident Reported To Police: No
Date Of Incident: 2017-10-18
(YYYY-MM-DD)
Date Added To File: 2017-11-10
(YYYY-MM-DD)
Date Complaint Received By NHTSA: 2017-11-10
(YYYY-MM-DD)
Date Purchased:
(YYYY-MM-DD)
Was Original Owner: No
Product Type: Vehicle
V = Vehicle T = Tires E = Equipment C = Child Restraint
Specific Component's Description: ELECTRONIC STABILITY CONTROL (ESC)
Anti-Lock Brakes: No
Cruise Control: No
Number Of Cylinders:
Drive Train Type:
[AWD, 4WD, FWD, RWD]
Fuel System:
FI = Fuel Injection TB = Turbo
Fuel Type:
BF = BiFuel CN = CNG/LPG DS = Diesel GS = Gas HR = Hybrid
Vehicle Transmission Type [Auto, Man]:
(DOT) Department Of Transportation Tire Identifier:
Tire Size:
Location Of Tire:
FSW = Driver Side Front DSR = Driver Side Rear FTR = Passenger Side Front PSR = Passenger Side Rear SPR = Spare
Type Of Tire Failure:
BST = Blister BLW = Blowout TTL = Crack OFR = Out Of Round TSW = Puncture TTR = Road Hazard TSP = Tread Separation
Was Defective Tire Repaired:
Was Part Original Equipment:
Date Of Manufacture:
(YYYYMMDD)
Type Of Child Seat:
B = Booster C = Convertible I = Infant IN = Integrated TD = Toddler
Installation System:
A = Vehicle Safety Belt B = Latch System
Dealer's Name:
Dealer's Telephone Number:
Dealer's City:
Dealer's State:
Dealer's Zipcode:
SOURCE OF COMPLAINT CODE:
CAG = Consumer Action Group CON = Forwarded From A Congressional Office DP = Defect Petition,result Of A Defect Petition EVOQ = Hotline VOQ EWR = EARLY WARNING REPORTING INS = Insurance Company IVOQ = NHTSA Web Site LETR = Consumer Letter MAVQ = NHTSA Mobile APP MIVQ = NHTSA Mobile APP MVOQ = Optical Marked VOQ RC = Recall Complaint, Result Of A Recall Investigation RP = Recall Petition, Result Of A Recall Petition SVOQ = Portable Safety Complaint Form (PDF) VOQ = NHTSA Vehicle Owners Questionnaire
Incident State Code:
Vehicle Operator's Name:
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