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2011 Hyundai SONATA Engine Problems, Complaints and Defects

Issue ID	1496253
Internal NHTSA #	11128262
Manufacurer	Hyundai Motor America
Brand	HYUNDAI
Model	SONATA
Model Year	2011
File date	10/11/17
Component	ENGINE
Product type code	VEHICLE
Description of the problem	The thermostat housing is plastic molded over a steel (metal) core. Where the housing is bolted to the engine over the input and output coolant orifices an internal piece of plastic flaked off the steel core behind the gasket surrounding the input orifice. At rest no coolant leaked out of the cooling system. However, at operating temperature and pressure, the coolant sprayed out of the engine in a fine mist/spray. Although there was an odor of coolant while driving, all searches around the heater core, under vehicle resulted in no evidence of coolant leak. On an extended trip at 103,000 miles enough coolant evacuated the cooling system to facilitate a blown head gasket. Yet there were no warning lights indicating overheating. The blown gasket was discovered when there was a sound of gurgling liquids originating from the coolant reservoir when we reached our destination, a thick sludge of coolant and oil permeated throughout the engine, heater core, throttle body and radiator. It was during repairs the thermostat housing was found to have the interior damage. If we had been driving 30 miles further than we did, the engine would have seized at highway speed, undoubtedly causing an accident. Thank god we stopped when we did.
Vehicle Mileage at Failure	103000
Number of Occurences
Source of the issue	NHTSA WEB SITE
City and State	JACKSON, MI
VIN pattern	5NPEB4AC5BHXXXXXX
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	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:

KNAPC813BCK289158 1D4PU4GKXBW598053 1LNHM81V17Y607547 KMHK281B9PU955525 WBSLZ9C5XDDZ77877 WF0MXXGBWMDU07509 SJNFCAJ11U2162922 WDC1671232A077043 WDD2050042R355673 WBA7F2C5XGG416281 WV1ZZZ2EZF6042057 2G1175S37F9176782

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2011 Hyundai SONATA Engine Problems, Complaints and Defects, Recalls and Failures

2011 Hyundai SONATA Engine Problems, Complaints and Defects

What is Recall?

What is Failure?

What is Defect?