MacBook Pro sleeps unexpectedly and runs fans at high speed, even after SMC reset

macbook propower-managementsleep-wake

My MacBook Pro (15 in Retina, early 2013, macOS 10.14.5) sleeps unexpectedly, although there is enough charge in the battery. To wake it up, I must connect the power supply. Furthermore, the fans run at high speed every now and then, even though the MacBook isn't under heavy usage and is properly ventilated.

I reset the SMC according to these instructions: https://support.apple.com/en-us/HT201295, but the problems went on. I checked the computer with EtreCheck (core version) and coconutBattery; both detected no issues.

What else could I try?

Best Answer

Run diagnostics on the Mac as follows:

  1. Disconnect all external devices
  2. Go to Apple Menu —> Restart
  3. Immediately press and hold down the D key while your Mac restarts
  4. Keep holding the D key until you see the screen listing different languages appears
  5. Click English. Apple Diagnostics starts automatically.

Common results could be:

  • Wi-Fi — a failure of the AirPort wireless card (4AIR)
  • Hard disk and SSD (4HDD)
  • Logic board (4IRP)
  • Memory — RAM (4MEM)
  • External disk (4MHD)
  • Fans (4MOT)
  • Processor (4PRC)
  • Video/graphics card (4YDC)

I'd recommend you see if you have a fan issue: 4MOT

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