Three problems related to engine knocking noise have been reported for the 2011 Hyundai Sonata Hybrid. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Hyundai Sonata Hybrid based on all problems reported for the 2011 Sonata Hybrid.
I was driving around 55 mph down the highway and noticed a strange knocking sound so I turned around to go home when I noticed smoke billowing out. I pulled over popped the hood and flames went up like crazy. I called 911 and vacated immediately.
Engine began making a engine knocking noise that became worse over three days (originally mistaken for bad gas but became much louder than that would be). While driving along a busy state road (nc 98) and car choked twice with a loud thump and I feared it would stall. Pulled over, shut vehicle off. Smoke was coming from engine compartment. No actual flames detected. Towed to dealer. Dealer described holes in the engine. Consulted Hyundai and they will only offer a short block replacement. Labor costs are approximately $2500 which I am required to pay. Vehicle has approximately 141k miles. Tow truck operator also told me to research the recalls on this vehicle but this vehicle was not listed but should be. It would appear that the recall was incomplete and should have been broader.
While driving on the highway I noticed a knocking sound radiating from my engine at speeds of 60 mph it the noise increased and then the engine appeared to be failing. My gages where the rmp's reflect where not functioning either. Amongst the engine issue my power steering column is also rattling as if it is loose and steering is become difficult. It is frightening to not feel safe in your own vehicle.