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1,8 GHz Dual-Core Intel Core i5 (Turbo Boost bis 2,8 GHz) mit 3 MB geteiltem L3-Cache

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CPU throttling sensor error code: 4SNS/1/C0000008: Th1H- -124


I found my Macbook (MacBook Air 13" Mid 2012 A1466 EMC 2559) was running very slow (slow boot, login, mouse lag etc.) and its fan was running fast. It was like this even when it was cold, no programs were running, and when on the login screen.

I looked in the activity manager and found that kernal_ task was at high CPU usage (>300%). I looked this up using Google and found that this is how Mac CPU throttling is done.

I have also noticed that if I wake the Macbook up from sleep, it will run fast for about the first 20 s then go back to being slow and the fan will speed up.

I ran the Apple Hardware Test (version 3A239) and found the error code 4SNS/1/C0000008: Th1H- -124 which I have looked up and found that it is a heat pipe (heat sink) temperature sensor error.

I then installed Mac Fan Control fan app to see what the temperature sensors are reading. I found that the temperature readings looked fine:


Battery Max: 26.2

Battery Sensor 1: 30.1

Battery Sensor 2: 30.6

CPU Core 1: 36.4

CPU Core 2: 35.0

CPU Core 3: 38.0

CPU Diode: 33.1

CPU PECI: 36.4

CPU Proximity: 28.1

GPU PECI: 37.0

Memory Proximity: 28.8

Palm Reset: 21.1

Platform Controller Hub Die: 44.0


APPLE SSD TS128E: 28.0

I have reset the PRAM and the SMC but this did not change the throttling and fan speed, and I still get the 4SNS/1/C0000008: Th1H- -124 error code.

I opened the Macbook up to see if anything near the heatpipe looked bad but I could not find anything. I removed the heatsink from the CPU to check the thermal paste and found that it was a bit dry so I replaced it.

I reset the PRAM and SMC again and reran the hardware test but this did not change anything either.

I think it is strange that I am getting normal temperature measurements using Mac Fan Control app but still getting the error code. Is this sensor’s value not displayed here?

I want to find the heat pipe temperature sensor and maybe try to reflow it but I don’t know where it is.

Does anyone know where this heat pipe temperature sensor is located?

Any other ideas on how to fix this issue would be greatly appreciated.


Update (09/05/2018)

Thanks for your reply Reece.

I have had another look in the Macbook:

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I found a bit of corrosion on one of the resistors underneath the main PCB:

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Does it look like this corrosion might be in a location that would cause this sensor error?

Beantwortet! View the answer Ich habe das gleiche Problem

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Yes! the corrosion is on on of the sensor lines! That's likely the cause of your thermal sensor error. You may need to also replace the resistor.


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2 Antworten

Gewählte Lösung

The 2011 and 2012 Airs can run very slowly if there is an issue with the battery, for example, if the wrong one is used or if there is a fault with the battery. This will cause the cursor to lag too, and is only an issue which can occur on the 2011/2012 Airs, it doesn’t happen when there is a battery fault on the newer models. I would also suggest checking the whole logic board for liquid damage, since it likely has some damage on the backside. Check the trackpad PCB and cable, in case there is corrosion (although this is unlikely to be the cause, since the cursor lagging will usually be battery or sensor related).

Check the board and hopefully you will find some corrosion to point you in the right direction

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I had one like this and i replaced Q5501 it got like thst because i did a GPU replacement.

Check Q5503, C5551 and U5550 one of this 4 could be the reason of your issue.

Well i had the issue in a 820-2915 MacBook Pro 15.4” 2010-2011. The sensor i replace was part of the GPU Proximity / GPU Die / Heat Pipe / Fin Stack circuit, so you can check something similar in your Schematic and do some testing.

Good Luck!

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Juan Corredor, can you please let me know how to order temp sensors Q5501

Q5503, C5551 and U5550. Thank you


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Boom King wird auf ewig dankbar sein.
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