This problem usually doesn’t have anything to do with the hardware of the smartphone. Before moving on with the solutions, make sure you have a working and stable internet connection. Also, it will be a good idea to check for any server outages by visiting Twitter support of DoorDash.
Solution 1: Force Stop the DoorDash App
Most of your mobile apps do not completely exit/close when you leave the application. Either the application itself or any of its services could be running in the background. The error 400 of DoorDash could be caused by a temporary glitch of the application which can be rectified by completely exiting the application i.e. force stopping it.
Solution 2: Clear Cache and Data of the DoorDash App
The DoorDash application uses cached data to boost up speed and improve user experience. However, a corrupt cache of the DoorDash application can cause several problems including the Error Code 400. In that case, clearing the cache and data of the application may solve the problem.
Solution 3: Reinstall the DoorDash Application
If cleaning the cache of DoorDash has not solved your issue, then most probably, the installation files of the application are themselves corrupt. Here, reinstalling the application may solve the problem. IMPORTANT: If you have a pending order, try to avoid uninstalling the application. If you must uninstall, then make sure to keep your login credentials safe.
Solution 4: Change Your Network Temporarily or Use a VPN
ISPs use different techniques and protocols to control web traffic and safeguard its users. But during this process, sometimes the essential resources required by the DoorDash can be blocked and thus cause the error under discussion. In that case, using a VPN or temporarily changing your network e.g. if using mobile data, then switching to a Wi-Fi network may solve the problem.
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