NHTSA complaint #11569863

Owner complaint summary

Vehicle sputter and coolant malfunction and engine light came on while driving ( 12-26-23) Took to dealer for some “ update”. After a few weeks of driving the vehicle sputter again and engine light came on again on the (1-19-2024 ) Drove home turned off , loud noises came from engine area. Tried to restart and failed a few times so we let it’s sit for almost an hour and it’s started again with engine light still on . Towed to Mercedes dealer and after long and frustrating times a week later per dealer it’s was the 48v hybrid battery that defective/ non functional. So far we been forced to drive the vehicle “as is” since Mercedes-Benz USA refused to let local dealer to order and replace the 48v hybrid battery. It’s been 2 weeks all informations we get from dealership is that we have to wait for Mercedes to come up with new software to update to which no time frame have been provided as to when software available. We’re experiencing terrible gas mileage MPG with the 48v battery basically non functional as moment