In brief, you can start the car from inside using the push-button Start/Stop with the key fob present, or remotely if your trim supports remote engine start. The guide below outlines both methods, plus common troubleshooting tips.
Inside the car: starting with the push-button Start/Stop
With the key fob inside the vehicle, starting is straightforward. The engine will only start if the fob is detected and the transmission is in Park with your foot on the brake.
Use the following steps to start from inside the Accord using the push-button Start/Stop feature.
- Ensure the transmission is in Park and all doors are closed.
- Place your foot firmly on the brake pedal.
- Press the Start/Stop button once to start the engine.
- Wait for the instrument cluster to illuminate and the engine to run.
- To turn the engine off, press the Start/Stop button again while the brake is applied or shift into Park and press the button.
The key fob must be detected by the vehicle for this method to work. If the car does not start, check the fob battery and try bringing the fob closer to the Start/Stop button area.
Remote start with the key fob
Some 2021 Accord trims offer remote engine start via the key fob. If your car supports this feature, use the steps below. Do not use remote start in enclosed spaces or unattended areas.
- Make sure the doors are locked and the fob is within range of the vehicle (typically a short distance from the car).
- Press the Lock button on the fob, then within a few seconds press and hold the Engine Start/Stop button for 1–2 seconds until the engine begins to run.
- The engine will run for a set period (commonly about 10 minutes); you can repeat the process to extend the run time if needed.
- To stop the engine remotely, press the Engine Start/Stop button again.
Safety note: Remote start will not engage if the hood is open, a door is ajar, or the ignition system detects a safety condition. Always ensure the area around the car is clear before starting remotely.
What if your key fob battery is dead?
If the key fob battery is dead, you may still unlock the door with the mechanical key blade hidden inside the fob, and you may be able to start the car by bringing the fob near the Start/Stop button if your model supports this proximity sensing. Otherwise, replace the battery or contact your Honda dealer for assistance. For many drivers, a dead fob battery means you cannot remotely start, but you can still start from inside once the fob is detected or battery is replaced promptly.
Alternatives: remote start via the HondaLink app
In some markets and configurations, you can start the engine remotely using the HondaLink app if you subscribe to the remote start service and the car is connected. Steps vary by app version and subscription level, so consult your owner's manual or app help for the latest instructions.
Summary
Bottom line: The 2021 Honda Accord can be started from inside with the push-button Start/Stop as long as the smart fob is detected and the car is in Park. Remote engine start via the key fob is available on certain trims and requires the fob to be within range and the vehicle to be in a safe state. If the fob battery is weak or dead, you may need to replace it or use the mechanical key to unlock the door and then start the car once the fob is detected or replaced. For precise instructions tailored to your exact trim and market, consult the owner’s manual or contact a Honda dealership.