manually disable ice engine

hi all, volt 2014 here i would like to manually disable the gas engine, like pulling the fuel pump fuse or unplug all spark plug.

fact is i sent to repair last year and they reprogrammed the computer but now even if i choose coldest, at 0c-32f the engine run. went for a 5 km run, its about -1C, and ice engine run all the time grrrrrr

just temporary as i plan to send back car for reprogramm

any hint a fuse i can pull