NHTSA Complaint #11423027 — 2013 HYUNDAI SONATA

Hyundai Sonata Hybrid 2013 - computer giving message " Check Charging System " while on the highway speed drops to 40 mpg. I had to stop the car on the roadside .. Hyundai dealer are not helpful. You go to them they just want to charge us $400 for diagnostic test. last week, Hyundai dealer told my car problem is with engine belt and tensioner assembly and I charged $900. but it did not fix the issue. I am not sure if above part was really needed to replaced, now the message on charging system and engine safety ( picture attached ) is too frequent. Ref. engine recall on this 2013 sonata hybrid, Hyundai dealer say car life is finish with 114K miles. and car engine is not issue as decide by Hyundai head office.