I have resolved my fan issue. A surface mount component had somehow come off the logic board and as a result the (pwm) fan control signal was not controlling the fan. The fan defaults to full speed when it sees no pwm signal. I was able to see the (monitor) signal was working by using smcfancontrol and the slowed the fan with my finger - the rpm changed. As a result the mac was requesting, for example, 2000rpm, but as the fan didn't see the request it was giving approx. 6500rpm, hence the error code. The missing component was a bridging SMD device. By hooking up an oscilloscope I could see a pwm signal on one side of the missing bridge, but no signal at the fan. As soon as the 2 pads were bridged normal service resumed. Not sure how this component has become detached, presumably when I removed the fan connector.
Anyway, it is worth checking for 2 solder pads just above the fan connector - if you see no component then you may have the same issue!
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I now have exactly the same issue. Everything works great apart from the fan at full speed! Did you have any luck in fixing your machines?
Check if all connector you have disconnected are correctly connected. I had this problem and the connector was in fault!
Same here on MacBook Pro 13" mid-2010. All of a sudden fan is at top speed and CPU usage by kernel_task 200-300% :/
par Davit Barbakadze