Apple Hardware Diagnosis/Test Check hardware
Another useful Mac feature is the built-in hardware diagnosis. Even before selling or after buying a used MacBook or any Apple device, I would recommend this test to everyone. The feature has been integrated into all MacBook/Air/Pro, Mac Mini, Mac Pro, and iMacs since mid-2013. It examines the hardware of the devices. If a fault is present, it will mostly be found here. All components, such as CPU, graphics, SSD, audio, camera, battery, and sensors, are checked. Please also connect the charger when checking, otherwise an error (PPP007) will be displayed
which only indicates the missing charger. Important: This description applies to devices from mid-2013 onwards.
To start the built-in hardware diagnosis, you must press the D key immediately after turning it on and hold it until the diagnosis starts. If there is also an Internet connection at the same time, the service status can also be queried.
The following table also lists the error codes and what they mean:
| Reference code | Definition of the code |
| ADP000 | No errors found |
|
CNW001 CNW003 CNW004 CNW005 CNW006 |
There may be an issue with the Wi-Fi hardware. |
|
CNW007 CNW008 |
No Wi-Fi networks were found. Either there are no Wi-Fi networks in range, or there may be an issue with the Wi-Fi hardware. |
|
NDC001 NDC003 NDC004 NDC005 NDC006 |
There may be an issue with the camera. |
| NDD001 | There may be an issue with the USB hardware. |
|
NDK001 NDK003 NDK004 |
There may be an issue with the keyboard. |
| NDL001 | There may be an issue with the Bluetooth hardware. |
|
NDR001 NDR003 NDR004 |
There may be an issue with the trackpad. |
|
NDT001 NDT002 NDT003 NDT004 NDT005 NDT006 |
There may be an issue with the Thunderbolt hardware. |
| NNN001 | No serial number was found. |
|
PFM001 PFM002 PFM003 PFM004 PFM005 PFM006 PFM007 |
There may be an issue with the System Management Controller (SMC). |
| PFR001 | There may be an issue with the computer's firmware. |
|
PPF001 PPF003 PPF004 |
There may be an issue with the fan. |
| PPM001 | There may be an issue with a memory module. |
|
PPM002 PPM003 PPM004 PPM005 PPM006 PPM007 PPM008 PPM009 PPM010 PPM011 PPM012 PPM013 PPM014 PPM015 |
There may be an issue with the integrated memory. |
|
PPP001 PPP002 PPP003 |
There may be an issue with the power supply. |
| PPP007 | The power supply was not checked. |
| PPR001 | There may be an issue with the processor. |
| PPT001 | The battery was not found. |
|
PPT002 PPT003 |
The battery needs to be replaced soon. It is functioning properly but holds less charge than when new. |
| PPT004 | The battery needs to be serviced. The battery is not functioning properly, although you may not notice any change in its behavior or charge capacity. You can continue to use the battery before having it checked. Your computer will not be damaged. |
| PPT005 | The battery is not installed properly. Shut down the computer and do not use it any further. The computer needs to be serviced. |
| PPT006 | The battery needs to be serviced. The battery is not functioning properly, although you may not notice any change in its behavior or charge capacity. You can continue to use the battery before having it checked. Your computer will not be damaged. |
| PPT007 | The battery needs to be replaced. It is functioning properly but holds significantly less charge than when new. You can continue to use the battery before replacing it. Your computer will not be damaged. |
|
VDC001 VDC003 VDC004 VDC005 VDC006 VDC007 |
There may be an issue with the SD card reader. |
|
VDH002 VDH004 |
There may be an issue with a storage device. |
| VDH005 | Unable to start OS X Recovery. |
|
VFD001 VFD002 VFD003 VFD004 VFD005 VFD007 |
There may be an issue with the display. |
| VFD006 | There may be an issue with the graphics processor. |
| VFF001 | There may be an issue with the audio hardware. |
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Keyboard commands on the Mac / Shortcuts Part 1 System Startup.
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