I have problem with SMC in MacBook Air 2016. While running on battery, data from SMC module freezes. In iStat Menus temperatures from sensors, RPMs, current meters and voltage meters from CPU aren't refreshing. Also fan sometimes switches on high RPM and runs continuously, even when laptop is quite cold. When I plug in charger, fan goes back to 1200 RPM and temperatures are being normally refreshed. I had this issue propably even before updating to Mojave. I tried resetting SMC, but nothing happens. What is the possible reason for this issue?
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You've already reset the System Management Controller, which was the first thing to try, so I would probably start with testing to see if this behaviour is replicated when booted into Safe Mode and if the issue persists then running Apple Diagnostics.
Boot into Safe Mode
Follow these steps to boot your Mac into Safe Mode:
If the problem doesn't occur while booted into Safe Mode, let me know and we'll go from there.
If the problem persists, proceed with running Apple Diagnostics.
Run Apple Diagnostics
Follow the steps below to run Apple Diagnostics:
Note: If pressing and holding the D key at Step 3 doesn't work, start again at Step 1 and, at Step 3 press and hold both the OptionD keys instead. This will try and run diagnostics from the internet instead, so you will need to allow more time for it to complete.
Regardless, take a note of what happens and let me know how you went.