2019 Hyundai Accent Knock Sensor Detection System

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Published on January 17, 2019 9:49:22 PM ● Video Link: https://www.youtube.com/watch?v=lMAlJQVQdCY

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The knock sensor technology will be installed through a free software update performed by Hyundai dealers and is rolling out through a product improvement campaign to approximately 2 million Hyundai vehicles, including all model year 2011-2018 Sonata and 2013-2018 Santa Fe Sport vehicles with engines produced in the U.S.

The knock sensor detection system software continuously monitors engine vibrations for unusual dynamic patterns that develop as an engine connecting rod bearing wears abnormally in a way that could later cause engine seizure. If vibrations caused by bearing wear start to occur, the malfunction indicator lamp will blink continuously, an audible chime will sound (in certain models) and the vehicle will be placed in a temporary engine protection mode with reduced power and acceleration. In this temporary mode, drivers maintain full control of the vehicle as brakes, steering and safety devices such as airbags remain operational.

The vehicle can continue to be operated for a limited time in engine protection mode to enable the customer to safely drive it to a Hyundai dealer for inspection and repair, but acceleration will be slower, with a reduced maximum speed of approximately 60 to 65 mph and a limited engine speed of approximately 1,800 to 2,000 rpm. Hyundai's knock sensor technology has been evaluated by an independent, leading engineering and scientific consulting firm. When tested using a fleet of vehicles specifically prepared to test the knock sensor technology, the knock sensor system successfully detected failing connecting rod bearings and responded with activation of the engine protection mode.

As part of this product improvement campaign, Hyundai will extend the warranty to 10 years and 120,000 miles (up from 100,000 miles) for original and subsequent owners of 2011-2018 Sonata and 2013-2018 Santa Fe Sport vehicles for engine repairs needed because of excessive connecting rod bearing damage.

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