This could be a bus/controller error or an SSD error - in my case it was both. If you feel your device is experiencing issues, be sure to run a an Apple Diagnostics test to see what the underlying conditions may be for your Mac.Hi, this is what I can tell you (after experimenting, visiting genius bar, etc.): VDH002 just indicates the state of the firmware not being able to talk to the SSD. Using Apple Diagnostics can be a great way to determine if there are any hardware issues with your device.
You are then able to Restart or Shut Down your device from the Apple menu. This will restart your Mac, and take you to a webpage that will provide more information. Apple will also provide you with service or support options.Įnsure that your device has an internet connection, and click “Get Started” or press Command-G.Clicking Shut Down or pressing S will restart your device.Click Restart or press R to restart your device.If you want to run the test again, either click “Run the test again” or press Command-R.To view a list of reference codes and the action you should take, you can view them on Apple’s official site here. When testing is complete, you will be shown the results by Apple Diagnostics.During the test, Apple Diagnostics will show a progress bar while it is doing a sweep of your device.If you want to connect your Intel-based device to the internet, press and hold Option-D at startup.Release the D key when you see the progress bar or if you are asked to choose a language.
#APPLE DIAGNOSTICS DEC400 MAC#
While the Mac is starting up, press and hold the D key.
To begin Apple Diagnostics with an Intel processor, follow these steps: Press Command (⌘) and D on your keyboard.This will include a gear icon that is labeled Options. Release the power button when you see the startup options window.Turn on your Mac, and continue to hold the Power button while your Mac is starting up.To begin Apple Diagnostics with Apple Silicon, follow these steps: Ensure the device is on a flat, hard and stable surface and has proper ventilation for your device.When your device is shut down, disconnect all external devices, except your keyboard, mouse, display, Ethernet connection (if you have one) and your connection to AC power.Go to the Apple menu and select Shut Down. What to Do Before Running an Apple Diagnostics Once you have determined your processor, follow the appropriate steps. If you have an Intel processor, About This Mac will show an item labeled Processor, which will show the name of your Intel-based processor.If you are using Apple silicon, the About This Mac page will show an item labelled Chip, and it will show the name of the chip.To determine this, go to the Apple menu and select About This Mac.
#APPLE DIAGNOSTICS DEC400 HOW TO#
Here’s how to determine what processor you are using. The first thing you will need to do is determine whether or not you have an Apple silicone or Intel-based processor. Running an Apple Diagnostics can also be helpful, as the program will suggest solutions for your issue, while also helping users contact Apple Support should they need further assistance.īefore beginning, you will need to complete a couple of steps. Completing this test can help determine if a specific hardware component is giving you problems. Running Apple Diagnostics can be a great way to check if your device is experiencing a hardware issue. This guide will show you how to use Apple Diagnostics to test your Mac.
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