The accelerator that is used as the gas pedal in some of the vehicles indicates your fierce which you use while going through life. If you press the accelerator with comfort shows that you are going through life without any fear. The accelerator that doesnt work, signifies the struggles you have in your waking life. If the accelerator got stuck, it shows that you should not go so fast and maybe even do less things in your waking life, because it is too dangerous.
Read more about dreaming of Accelerator in other dream meanings interpretations.