Three problems related to engine clicking and tapping noises have been reported for the 2006 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Hyundai Sonata based on all problems reported for the 2006 Sonata.
Purchased this Sonata used 3 months ago with 45,800 miles on it, drove it 4,000 miles and it developed a engine ticking noise which now has turned into a knocking sound at 1800 rpms goes away, then comes back at 2200 rpms. I contacted Hyundai customer service to establish a case number. The dealer has removed the oil pan and found shavings saying it needs a "short block" motor replacement at a cost of $5,800. Hyundai motor America denied the request for repair totally. I find that at 50,000 miles and being only the second owner, this motor had a defect that should be acknowledged as a defect and they should stand behind there product! this is my third Hyundai, new 2005 and new 2007 and I'm seriously in the market for a new SUV but if Hyundai won't stand behind a costly defect like this they will loose a 10 year very loyal customer forever.
At approx. 79k miles, when vehicle was turned on you could hear a mild knocking noise, and then it would fade. Took to dealer they could not identify the problem. At approx. 96k miles vehicle was driving on highway and vehicle shut off. Could not restart. Towed the vehicle after wards vehicle started up and knocking noise got louder. The noise is now on all the time and has a cyclic knocking noise from the engine. Advised manufacturer of other problems with vehicle in July of 2015. The engine stall happed in mid Aug of 2015. Had vehicle diagnosed on Aug 27, 2015. I have uploaded that diagnosis. Dealer advised possible metal debris, but said I would have to pay addistional fees to determine the cause. The diagnosis states the same problems as the NHTSA campaign number: 15v-568 and Hyundai campaign # 132. Loud tapping noise when running coming from bottom end rod. Need engine replaced. This was documented before the news broke out about the engine recall.
I own a 2006 Hyundai Sonata, at 100,000 (hwy miles) the front upper control arms became squeeky and detatched from the rubber bushings, making a horrible ride and clunking sound when I would put the car into gear. This problem makes the car bouncy and unstable. There is also a knocking or loud clicking sound in the engine at crusing speeds, when I barley push the gas pedal. It sounds like the air intake control valve. It goes away when I accelerate. The radio and cruise control electornics seem to work only when they want too!.