dancy

I have a 2016 RX350 AWD with the usual bells /whistles, one of which is the "hill holder" feature . The problem I have , I'm assuming its the problem , I get a annoying squeak at the back of the car after using the feature several times and then shut off the car say at a filling station ,at home ETC; . One Lexus Mechanics says its the fuel pump in the gas tank another says its the pump that actuates the "hill holder". they say all the cars with that feature turned on make that noise, oh great and that there is no fix . Help , its getting louder.