Macbook Pro CPU Temperature Sensor Error

Well well, just look at all these ‘clone’ replies telling you to get down to an Apple Store ASAP, and spend upwards of £500 on a new motherboard just because one sensor is faulty.

Is this for real? One tiny little temp sensor goes wrong and the whole board must be replaced? What planet is Apple on? Well I will tell you; planet maximise income, that is what; and if that means forcing everyone to replace almost the entire contents within the casing once the machine is out of warranty, then so be it.

How do you think they became a $1 trillion company? Given that the motherboards are probably put together by some 12 year old girls in a Chinese sweatshop factory while earning $1 a day, is it surprising that components fail?

Oh, and while smcFanControl will not override the fan settings, the SSD Fan Control app will, and it is free - although you can donate by PayPal (I did because of the sheer relief at the peace and quiet).

I also have Temperature Gauge 4.1 running on my MacBook Pro and that tells me that the CPU runs at around 50C if I pre-set the fans at 2500rpm, whereas the SMC fan temp readout is 128C which is the default Mac setting for a faulty sensor somewhere. Of course this means kernel_task is using 80% of my cpu time constantly, but hey! I paid £1500 for my MacBook why shouldn’t I suffer by only being able to make use of 20% of its capacity?

The excuse the company clones use is that I might overheat my processors. Really? Are all Apple users that dumb? I have a temp readout on the screen next to the date/ time, and SSD Fan Control icon in the dock. Plus I have alerts set at certain high temperatures, to warn me if things get heated inside the computer.

This is my computer, which I paid for with my money. It is well out of warranty and would work really well if it were not for the arrogant and patronising system that Apple install to prevent anyone but their clones having control.

At the very least, an option to override or disable the output of faulty sensors should be provided. If owners wish to proceed then the responsibility for any damage would be entirely theirs. At present we do not have this choice, and have to suffer a computer form of Stalinism, where all dissenting voices are either ignored or censored.

Welcome to Apple Support Communities

The sensor must be replaced as soon as possible. The right fan is not working, and the temperature is not being detected properly.

Take it to an Apple Store or reseller to get your logic board replaced, being a very expensive repair. I would not discard this is the reason why your Mac works slow

When temperature is higher, fans run higher, and if they can't, your Mac may turn off automatically or slow down in order to prevent further hardware damages, although slowness is often caused by other issues than the fan

A faulty temperature sensor will automatically make the fan default to maximum speed as a precautionary measure. You also indicate that the internal temperature is 198° which is very high. There are probably other issues. Do take it to an apple store and have the exact problems diagnosed for free. As mende1 suggests, the logic board may have to be replaced in order to repair it to operate properly. That is an expensive repair

Ciao.

The fan itself can be replaced fairly inexpensively, but as mende1 wrote, that may not be the problem or the sole reason for slow performance.

Tell us the result of replacing its SATA cable when you have finished

I have the same problem on my MacBook Pro 17" (mid 2010)

4SNS/ 1 /C0000008: TC0D--124

High revs on both the fans, from startup.

Someone know where is locadet and what to do about it?

😕

As for now you should download iStat Menus, an app where you can control the speed of your fans, then, you should get them checked with apple.

"Well there's only one fan, thats why it says the other one isnt working."

The reason why it says one isn't working is because your model is a non-retina pro and that means you have only one fan. In the retinas, we have two fans. But don't take this problem lightly as it can cause a lot of problems. And the logic boards aren't cheap either. I've replaced three of them in less than a year and thankfully Apple covered it. If they didn't cover it, I would have paid $530 for each repair. The board itself is $480. And get rid of SMC fan control, it's pointless. But when you do, you have to go into some of the files and delete some of the files related to SMC Fan control. Just google how to uninstall SMC fan control.