Apple Hardware Test (AHT) and Apple Diagnostics (AD) Codes

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Use SMC Sensor Codes to interpret Apple Software Diagnostics(ASD) output. ASD is available only as a bootable DMG images which should be burned on

Apple Diagnostics(AD) replaces built-in Apple Hardware Test(AHT) for devices manufactured after 2013. Some older devices will also load AD instead of AHT if you update the OS or use Option+D to download it online. Many older devices lose AHT after upgrading your OS, since it wipes it from the hard drive and its not available online.

AHT Codes are more complex and give more information on the issue.

The first part is a device name:

  • 4ETH: Ethernet controller
  • 4IRP: Main Logic board
  • 4MLB: Logic board controller
  • 4PRC: Processor
  • 4HDD: Hard disk
  • 4MHD: External disk
  • 4YDC: Video card
  • 4SNS: System sensor
  • 4MOT: Fan motor
  • 4MEM: Memory module
  • 4AIR: AirPort wireless card

Most of them pretty straight-forward except 4SNS which will be follower by either V (Voltage or Current sensor) or T for thermal sensor.

  • A: Ambient Air Sensor
  • B: Battery
  • C: Central Processors (CPU)
  • D: DC (Direct Current)
  • e: PCI-Express Slot
  • F: FireWire Port
  • G: Graphics Processor (GPU)
  • H: Hard Disk
  • h: Heat Sink (or Heat Pipe)
  • L: LCD display
  • M: Memory (or Memory Riser Boards)
  • m: Miscellaneous (Peripherals such as a Battery Charger)
  • N: North Bridge (Logic Board Controller)
  • O: Optical Drives
  • P: Power Bus
  • p: Power Supply
  • s: Trackpad
  • W: Airport Wi-Fi Card

For example: 4SNS/1/40000000: TA00 means Ambient thermal sensor.

If your device is newer than 2013 or you booting it online from some older devices, there's AD which is much less reliable and kind of helps you to book an appointment in Genius Bar instead of showing the real issue. Use Apple MRI to gather more information.

AD Codes
Code Explanation Actual Board problem
ADP000 No issues found
CNW001…06 Wifi not detected
NDC001…6 Camera not detected
NDD001 USB Overcurrent
NDK001 Keyboard problem
NDL001 Bluetooth
NDR001 Trackpad not detected
NDR003
NDR004
NDT001 Thunderbolt issue
NDT002
NDT003
NDT004
NDT005
NDT006
NNN001 A serial number was not detected. Don't forget to correct SN/CRC/CleanME
PFM001 There may be an issue with the System Management Controller (SMC).

Actually means thermal or current sensor failure.

Most common problem after water damage

PFM002
PFM003
PFM004
PFM005
PFM006 Trackpad on 820-00165
PFM007
PFR001 There may be an issue with the computer's firmware.
PPF001 There may be an issue with the fan.
PPF003
PPF004
PPM001 There may be an issue with a memory module.
PPM002 There may be an issue with the onboard memory.
PPM003
PPM004
PPM005
PPM006
PPM007
PPM008
PPM009
PPM010
PPM011
PPM012
PPM013
PPM014
PPM015
PPP001 There may be an issue with the power adapter.
PPP002
PPP003
PPR001 There may be an issue with the processor.
PPT001 The battery was not detected.
PPT002 The battery will need to be replaced soon. It is functioning normally, but holds less charge than it did when it was new.
PPT003
PPT004 The battery requires service. The battery is not functioning normally, though you may not notice a change in its behavior or the amount of charge it holds. You can continue to use your battery before it’s checked without harming your computer.
PPT005 The battery is not installed properly. Shut down and discontinue use. The computer requires service. Check battery communication cable on 2015 and later models.
PPT006 The battery requires service. The battery is not functioning normally, though you may not notice a change in its behavior or the amount of charge it holds. You can continue to use your battery before it’s checked without harming your computer.
PPT007 The battery needs to be replaced. The battery is functioning normally but holds significantly less charge than it did when it was new. You can continue to use the battery until you replace it, without harming your computer.
VDC001 There may be an issue with the SD card reader.
VDC003
VDC004
VDC005
VDC006
VDC007
VDH002 There may be an issue with a storage device.
VDH004
VDH005 Unable to start OS X Recovery.
VFD001 There may be an issue with the display.
VFD002
VFD003
VFD004
VFD005
VFD007
VFD006 There may be an issue with the graphics processor.
VFF001 There may be an issue with the audio hardware.