NHTSA Complaint #11465009 — 2016 HYUNDAI SONATA HYBRID

Recently Service Campaign 966 (NHTSA ID Number: 10210205 Manufacturer Communication Number: 22-01-028H) was applied to my vehicle for improved knock sensor detection system (KSDS) logic. Six days following the software update, my vehicle stalled when DTC P1326 came active during my wife's commute home. We had the vehicle towed to the dealership where a knock sensor was identified to be replaced. 10 days after getting the vehicle back, knocking was heard from the engine compartment and DTC 1326 came active again, causing the vehicle to immediately stall. It did not go into engine protection mode as service campaign 966 indicated it would. My concern is that Hyundai changed the sensitivity of knock detection to prevent warranty claims on engines that may be affected by increased bearing wear; and in preventing replacing engines, they have caused engines (mine included) to stall. This engine stalling is a safety issue and they have left customers with no option to use their vehicle safely if the engine passes their bearing clearance test, which is required for an engine replacement under warranty.