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2011 Hyundai SONATA Power Train Automatic Transmission Problems, Complaints and Defects

Issue ID	876834
Internal NHTSA #	10420749
Manufacurer	HYUNDAI MOTOR COMPANY
Brand	HYUNDAI
Model	SONATA
Model Year	2011
File date	16/08/11
Component	POWER TRAIN:AUTOMATIC TRANSMISSION
Product type code	VEHICLE
Description of the problem	For the second time, in interstate high speed traffic (70mph) the car without warning downshifted. A thunderous clunk is accompanied by the car lurching as it deaccelerates then almost immediately resumes speed. But instead of the engine being at 1800 rpm its closer to twice that. In both cases the driver behind me thought that i braked intentionally and nearly rear ended me. The car is then stuck in a lower gear and is driveable with extremely poor response. I had it towed once at the dealer's request and the last time i was able to drive it to a different nearby dealer to demonstrate that unquestionably the car was stuck in one gear. It is an automatic. I'm skeptical that either dealer has any clue to what is wrong. I won't let anyone in the family besides me drive the vehicle as i'm afraid for their safety. It has less than 7000 miles and is 8 months old. The first event was over 1000 miles ago and about 5 weeks earlier.
Vehicle Mileage at Failure	5488
Number of Occurences	1
Source of the issue	NHTSA WEB SITE
City and State	JACKSONVILLE, FL
VIN pattern	5NPEB4AC8BHXXXXXX
Was vehicle invloved in a crash?	N
Was vehicle involved in a fire?	N
Was incedent reported to police?	N
Was medical attention required?
Was part original equipment?
No. of injured persons
No. of fatalities
Date of purchase	07/08/26
Was original owner?	N
Anti-lock brakes	N
Cruise control	N
Number of cylinders	4
Drive train type
Transmission type
Vehicle speed	70
DoT tire identifier
Tire size
Location of tire code
Type of tire failure code
Was defective tire repaired?
Date of manufacture
Type of child seat code
Type of restraint
Dealer's name
Dealer's telephone number
Dealer's city
Dealer's state code
Dealer's ZIP code

What is Recall?
A recall is when a product is removed from the market or a correction is made to the product because it is either defective or potentially harmful.
What is Failure?
Failure is the state or condition of not meeting a desirable or intended objective, and may be viewed as the opposite of success. Product failure ranges from failure to sell the product to fracture of the product, in the worst cases leading to personal injury, the province of forensic engineering.
What is Defect?
Non-conformance of a car component with the specified requirements, or non-fulfillment of user expectations, including the safety aspects.

Last decoded VIN:

LC0FD1C46T5131272 1FA6P8TH6F5374720 5GTDN136968277337 W1K3F4HB6NJ345453 WDDZF0EB0JA434923 JLFFEB51E0KJ35580 JYACG27C49A031002 RP0TC2D42NS011577 6G1EK8E59BL564357 VF1BZ000648031809 MAT627615TLF52343 JLFFEB51E0KJ35969

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2011 Hyundai SONATA Power Train Automatic Transmission Problems, Complaints and Defects, Recalls and Failures

2011 Hyundai SONATA Power Train Automatic Transmission Problems, Complaints and Defects

What is Recall?

What is Failure?

What is Defect?