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2012 Hyundai SONATA HYBRID Power Train Problems, Complaints and Defects

Issue ID	1522456
Internal NHTSA #	11161831
Manufacurer	Hyundai Motor America
Brand	HYUNDAI
Model	SONATA HYBRID
Model Year	2012
File date	27/11/18
Component	POWER TRAIN
Product type code	VEHICLE
Description of the problem	While trying to accelerate at freeway speeds (50-60mph), the "eco guage" revs up but the car will not accelerate - slows down in the middle of traffic. The oil pressure warning lamp flickers on and off as well. After the car is stopped and turned off, the car functions normally. Mechanics are unable to retrieve any codes from the system. The car has intermittantly dropped into this mode at least 10 times since we first experienced the problem in july 2018. The problem occurs at freeway speeds causing the car to rapidly decelerate in fast moving traffic with no advance warnings. This situation requires immediate evasive action to remove the car from high speed traffic lanes so it can be shut down and towed to the hyundai dealer. My wife and i consider this a life-threatening situation as it has occurred in places such as the bay bridge (with no shoulder) and a lengthy underwater tunnel (again with no shoulder). We have taken it to the hyundai dealer service shop four times. They have replicated the problem and have tried various repairs - replace transmission oil pump, replace inhibitor switch, install new auxilliary battery, and - finally - replacing the transmission. Even after the transmission replacement, the car shut down while the mechanic was test driving it and provided a code to replace the crankshaft position sensor. The mechanics still are not certain they have fixed the problem. It appears as if hyundai is aware of the problem as their technical support staff have a protocol for repairing the car. Given the intermittant nature of the problem, the fact that it occurs at high speeds, and the potential danger of having your car rapidly decelerate on busy freeways, i think this is a safety issue that needs to be addressed by hyundai. Attached is the original service record that describes the problem (date 8/6/18). The most recent occurrence was 11/27/18.
Vehicle Mileage at Failure	80000
Number of Occurences
Source of the issue	NHTSA WEB SITE
City and State	INCLINE VILLAGE, NV
VIN pattern	KMHEC4A45CAXXXXXX
Was vehicle invloved in a crash?	N
Was vehicle involved in a fire?	N
Was incedent reported to police?	N
Was medical attention required?	N
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
Drive train type
Transmission type
Vehicle speed	60
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:

W1K1770841N207550 5XYKWDA28CG217051 W0VMR8602LB211535 KM8J338A22H463268 MHKVC31F6EK603750 3MZBN1U7XHM110048 VF34C9HZH9S069363 JTDKW923395121771 WBA8E3105JA381888 JF1SHHLZ3AG171830 KNAFZ411AF5534538 SJNFAAF16U1015888

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2012 Hyundai SONATA HYBRID Power Train Problems, Complaints and Defects, Recalls and Failures

2012 Hyundai SONATA HYBRID Power Train Problems, Complaints and Defects

What is Recall?

What is Failure?

What is Defect?