NDR001-004: problem detected with the trackpad.NDL001: problem detected with Bluetooth hardware.NDK001-004: problem detected with the keyboard.NDD001: problem detected with the USB controller.NDC001-006: problem detected with the camera.CNW001-006: problem detected with the Wi-Fi hardware.Ranges are indicated below with dashes to reduce repetition. Reference codes are formatted as a three letter code followed by a three number code with no spaces. The brief textual explanations that accompany the reference codes are the full extent of the reference code details that Apple makes available to the consumer. Reconnect the device if it wasn’t tested or detected or get support from Apple. In general, most error codes are treated the same way. That’s the only time Apple Diagnostics sends information to Apple.Īpart from the ADP000 code, which means no problems are found, the reference codes produced by Apple Diagnostics tell you something about the type of problem you’ve encountered. If you have telemetry turned off, this will also ask for your permission before sending any information about your computer to Apple. If you click “Get Started” or press Command + G, your Mac will boot into Recovery mode and launch an Apple Support web interface, provided you have an Internet connection. Then, turn on your Mac while holding Option + D instead of just D. If you receive a battery-service related code (PPT004), Apple specifically recommends re-running Apple Diagnostics over the Internet. If you get multiple tests with the same result, your confidence in the source of the problem is that much greater. If you don’t see the problem on the repeated test run, it might be either intermittent or a false positive. If you do see a problem, it’s always a good idea to repeat the test. Once the test is finished, you can repeat the test, find more information about the error codes, or shut down or restart your Mac normally. Once it’s finished, you’ll see the relevant diagnostic reference codes appear on the screen.ĥ. Wait a few minutes for Apple Diagnostics to finish running. Restart your Mac while holding down the D key on your keyboard.Ĥ. Disconnect all external devices from your Mac, except for your mouse and keyboard.ģ. ![]() ![]() This reduces the number of confounding factors that could complicate a diagnosis.ġ. It helps if you disconnect all your unnecessary peripherals first, leaving the keyboard and mouse connected. Running Apple DiagnosticsĪpple Diagnostics must be run from boot, requiring you to restart your Mac. While it can only detect the problems that it was programmed to detect, and its analysis isn’t particularly nuanced, Apple Diagnostics can give you an idea of the severity and type of problem you’re facing. ![]() You can use it to search for problems in all of the Mac’s major systems, from input devices like the keyboard and trackpad to display devices like the graphics processor to the core of the computer, the CPU, storage, and memory. It can run diagnosis algorithms on your Mac’s hardware without visiting the Apple Store. What Is Apple Diagnostics?Īpple Diagnostics is a diagnostic tool built into every Mac. Except that’s not really true: you can use Apple Diagnostics to access Apple’s diagnostics package from any Mac. Diagnostic programs that can accomplish this process are typically only available to authorized shops. Especially when it comes to hardware, certain types of failure can cause programmatically-detectable signals that reveal the cause of the problem. Computers tend to fail in predictable ways.
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