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Apple Hardware Diagnostics / Test Check Hardware
Another part of the useful Mac features is the built-in hardware diagnostics. I would also recommend this test to everyone before selling or after buying a used MacBook or any Apple device in general. The function is integrated in all MacBook / Air / Pro, Mac Mini, Mac Pro and iMacs from mid-2013. The hardware of the devices is examined here. If there is an error, 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 will be displayed (PPP007),
which only refers to the missing charger. Important: This description refers to devices built in mid-2013 or later.
In order to start the integrated hardware diagnosis, the D key must be pressed immediately after switching on and held 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:
| Referral Code | Definition of the code |
| ADP000 | No errors found |
| CNW001 CNW003 CNW004 CNW005 CNW006 |
There may be a problem with the wireless hardware. |
| CNW007 CNW008 | No WiFi networks were found. Either there are no WiFi networks in range, or there may be a problem with the WiFi hardware. |
| NDC001 NDC003 NDC004 NDC005 NDC006 |
There may be a problem with the camera. |
| NDD001 | There may be a problem with the USB hardware. |
| NDK001 NDK003 NDK004 |
There may be a problem with the keyboard. |
| NDL001 | There may be a problem with the Bluetooth hardware. |
| NDR001 NDR003 NDR004 |
There may be a problem 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 a problem with the System Management Controller (SMC). |
| PFR001 | There may be a problem with the computer's firmware. |
| PPF001 PPF003 PPF004 |
There may be a problem with the fan. |
| PPM001 | There may be a problem with a memory module. |
|
PPM002 PPM003 PPM004 PPM005 PPM006 PPM007 PPM008 PPM009 PPM010 PPM011 PPM012 PPM013 PPM014 PPM015 |
There may be a problem with the onboard memory. |
| PPP001 PPP002 PPP003 |
There may be a problem with the power supply. |
| PPP007 | The power supply has not been checked. |
| PPR001 | There may be a problem with the processor. |
| PPT001 | The battery was not found. |
| PPT002 PPT003 | The battery will need to be replaced soon. It works properly but has less charge capacity than when new. |
| PPT004 | The battery needs to be repaired. The battery is not working 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. This will not damage your computer. |
| PPT005 | The battery is not installed properly. Shut down the computer and stop using it. The computer needs to be repaired. |
| PPT006 | The battery needs to be repaired. The battery is not working 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. This will not damage your computer. |
| PPT007 | The battery needs to be replaced. The battery is working properly, but has significantly less charge capacity than when it was new. You can continue to use the battery before replacing it. This will not damage your computer. |
| VDC001 VDC003 VDC004 VDC005 VDC006 VDC007 |
There may be a problem with the SD card reader. |
| VDH002 VDH004 | There may be a problem with a storage device. |
| VDH005 | Unable to boot into OS X recovery. |
| VFD001 VFD002 VFD003 VFD004 VFD005 VFD007 |
There may be a problem with the display. |
| VFD006 | There may be a problem with the graphics processor. |
| VFF001 | There may be a problem with the audio hardware. |
