When a car won't shift into reverse or drive, the driver should open the hood to check the transmission fluid level. The precise procedure varies from one model to another, so it is necessary to consult the vehicle's manual for accurate instructions.
The judicial branch can declare laws passed by Congress or executive acts by the President of the United States unconstitutional, thus legally voiding them. However, all federal judges are nominated by the president and approved by the Senate. Additionally, Congress can remove a federal judge from office by impeachment.
The Judicial branch, particularly the US Supreme Court, holds the power of  judicial review , which means they can evaluate legislation that is challenged in court to determine if the law is constitutional. If the Court decides the law violates constitutional provisions, it will be nullified, or overturned.