error codes in AHT “what is what”

[Repairable]

Probably wel known for most. And for most useless. But anyways.

https://www.techrepublic.com/articl...-in-apple-hardware-test-or-apple-diagnostics/

 

[smiba]

Lets make a nice copy of it here so we're not all reliable on a single website in case it goes down

For the first part of the AHT error code: (XXXX/0/00000000: XX00)

• 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

For the second part of the AHT error code: (XXXX/0/00000000: XX00)

• 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