Yes — you can start the car even if its key fob battery is dead by using Honda's backup start method and, if necessary, the mechanical key blade stored in the fob. The exact location and steps can vary by trim, so check the owner’s manual for your model.
In the 2020 Honda Accord, the Start/Stop button relies on the smart key fob to communicate with the vehicle. When the fob battery dies, the car provides a backup way to start so you can move the car to a safe location or get a jump-start for the fob battery. This guide outlines the typical approach and what to do next to restore reliability.
Backup start method when the fob is dead
Access and initiate the start
Use the backup method that allows the engine to start even if the fob battery is dead. The car will require the fob to be present inside the cabin or near the start button and the brake pedal pressed.
- Sit in the driver's seat and depress the brake pedal.
- Hold the dead key fob near the Start/Stop button or in the designated backup spot described in your manual.
- Press the Start/Stop button with the brake pedal still pressed to start the engine.
The exact proximity or location for the backup start can vary by trim, so consult the owner's manual or a dealer if the car does not respond to this method.
What to do next to restore reliability or replace the fob battery
Battery replacement and alternative access
If the backup start works, you should still replace the key fob battery so normal keyless operation is restored. If it doesn't work, use the mechanical key or obtain roadside help.
- Replace the key fob battery. Most Honda fobs use a CR2032 battery; locate the seam on the fob, pry gently with a small tool, and swap in a fresh battery.
- Alternatively, use a spare fob if you have one. If both fobs are dead, you may need roadside assistance to unlock the car or start it or to obtain a temporary solution from a dealer.
- Visit a Honda dealer or locksmith to reprogram or replace the fob if the battery replacement does not restore function, or if the fob is damaged.
Keeping a spare battery or a backup fob handy is advisable so you are not stranded if the primary fob battery dies in the future.
Summary
The 2020 Honda Accord supports a backup start method for dead key fobs, typically requiring the fob to be near the Start/Stop button and the brake pedal to be pressed. If this fails, use the mechanical key to access the car and arrange a battery replacement or a new fob from the dealer or roadside assistance. Regularly replacing the fob battery and keeping a spare can prevent future starting issues, and always refer to the owner's manual for your specific trim's procedure.