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Level 4

1,224 points

4xxx/6/40000005: Battery error during online hardware test

I Am running into a brick wall with my late 2011 17" MBP. The other day I got a gray screen at startup and nothing else. Booting into safe mode or resetting the NVRAM doesn't do anything. I booted up holding option and d and got the internet hardware test. I ran the extended test and got a battery fault. The title explains it but the picture shows the strange symbols.

It gets halfway through the startup progress bar then goes to a black screen and then gray. I am stationed in korea and I am having a hard time finding a authorized apple repair place. I contacted Apple and they gave me the Korean website to find a location. Of course it is in Korean and I can understand any of it.

I did replace the battery about 6 months ago but haven't been having any problems.

Posted on Oct 27, 2016 9:34 PM

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6 replies

Jun 18, 2017 11:11 AM in response to jchrisl

Hello,

I have the same problem with my MacBook Pro late 2011. I purchased a battery from a authorized retail/service provider (WestWorld computers) and sold me a nupower battery. It is still giving me the same error.

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Dec 14, 2017 5:34 AM in response to corrona51

Hi Corrona, good morning. I am having the exact problem as you: kernel_task makes the computer unusable. I tried running diagnostics to try to pinpoint the problem (temperature seems ok) and got the 4xxx battery error. Did you managed to fix the kernel_task slowness? Do you think its related to the battery error code?

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Level 9

57,305 points

Oct 28, 2016 4:38 AM in response to Quack

Did you try a SMC reset?

https://support.apple.com/en-us/HT201295

If no success, bring the MBP in for service.

Ciao.

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Level 4

1,224 points

Oct 28, 2016 8:34 AM in response to OGELTHORPE

I did and met the same results. I am going to run another hardware test then look and see what the battery is doing.

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Level 1

19 points

Dec 5, 2016 11:10 AM in response to Quack

A client of mine brought in his 15" MacBook Pro 2011 to repair some subtle display distortion, which turned out to be symptom much dust accumulation. While checking the video issue, I ran the Apple Hardware Test (opt-D upon startup). It gave me the same 4000/6/40000005 error message. I probably could have found more information, had I spent more than five minutes Googling it. Instead, I asked the customer about the battery's history.

I turns out he had just replaced the battery recently. My hunch is that it may be an off-brand battery. It could also be that the low battery cycle count doesn't match the Mac's age. Whether it's a non-Apple or simply new, alerting the user of this detail would make sense.

I told my customer to continue using the laptop as usual, but to keep a power cord handy. I hope this helps.

PS there were no apparent power-related issues with the Mac beyond the error message.

Chris Leeds

Independent Apple Certified Specialist

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Nov 9, 2017 3:39 AM in response to Quack

I am having the same issue, However mine is also causing the kernel_task to spike and use over 800% cpu usage making the Macbook really slow and unusable.

I tried replacing the battery to no avail.

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4xxx/6/40000005: Battery error during online hardware test

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