Fan runs all the time.. Apple Hardware Test Error

The fan on my 13" Macbook Pro recently started running continously. I tried resseting the SMC per directions on the apple support page, when that didnt work I ran the Apple Hardware Test from my install cd, and got the following error: 4SNS/1/4000000 : TNOD-128.000
I've googled everywhere, and can't find what that means!
Any ideas?

Hi Alex FLB, welcome to Apple Discussions!
I had this exact error code (4SNS/1/4000000) on my iMac a couple months ago, along with the same symptoms. The code refers to one or more faulty temperature sensors on the logic board of the unit. Because the MBP isn't getting a reading from a temperature sensor, it has no idea what the actual temperature of the computer is, so it runs the fans at high speed in a fail-safe mode to prevent damage.
What this means is that you'll have to either take the machine to an Apple store or call Applecare over the phone to initiate a repair. Tell them the symptoms, and have them run the AHT or give them the code. If the machine is still under the one year warranty (or Applecare) then the logic board should be replaced free of charge for you. It's the only way to replace these temperature sensors, as they are incorporated into the board itself and cannot be separated from it.
If you Google "AHT 4SNS/1/4000000" then you may be able to find more information!
--Travis

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Message Edited by icantux on 07-09-2008 02:18 PM

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4SNS/1/C0000008:TS2P--124
When U install the SSD under the optical drive(OD), the air from the OD fan that was supposed to swing under the OD to exit on the uppper vent has no where to go and hence swings across and exits mostly through the vent on the other side near the camera whereon lies a Skin sensor, which blows away/damages tricking the iMac to believe that the CPU is hot and the CPU fan starts to run at full speed of 4000rpm and the Apple hardware shows error 4SNS/1/C0000008:TS2P--124.
This skin sensor will then need to be replaced.
The CPU Fan cannot be controlled by any software.
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2.Change the Optical Disk drive with a "SSD in a Optical Drive(OD) Caddy".This will result in the optical drive fan running at a higher speed as the SSD does not have any moving parts.The OD fan sensor gets to believe that the OD is hot since it does not get inputs from the SSD.Once you change to SSD you can use software to control the HDD or the Optical fans.
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Guys my macbook fan keep on running all the time is there any problem with the system? With this im attached my report, please anyone help me.
Love u Guys for a big help!
Hardware Information:
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Video Information:
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Disk Information:
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                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Brainy (disk0s2) / [Startup]: 106.72 GB (14.08 GB free) (Low!)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
                    Bunker (disk0s4) /Volumes/Bunker: 142.34 GB (39.09 GB free)
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USB Information:
          Apple Inc. Built-in iSight
          Apple, Inc. Apple Internal Keyboard / Trackpad
          Apple Computer, Inc. IR Receiver
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
FireWire Information:
Thunderbolt Information:
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Launch Daemons:
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          [System] com.adobe.SwitchBoard.plist 3rd-Party support link
          [System] com.microsoft.office.licensing.helper.plist 3rd-Party support link
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User Launch Agents:
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          [not loaded] com.google.GoogleContactSyncAgent.plist 3rd-Party support link
          [not loaded] com.google.keystone.agent.plist 3rd-Party support link
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          iTunesHelper
          Google Drive
Internet Plug-ins:
          AdobeExManDetect: Version: AdobeExManDetect 1.1.0.0 - SDK 10.7 3rd-Party support link
          FlashPlayer-10.6: Version: 12.0.0.77 - SDK 10.6 3rd-Party support link
          Default Browser: Version: 537 - SDK 10.9
          Flash Player: Version: 12.0.0.77 - SDK 10.6 3rd-Party support link
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the fan always runs, usually you cant hear it. Right now my fan is running at 1996RPM and I would know it was on unless I checked.vv Is is running loud all the time?

Does GeForce 7350LE video card fan run all the time or at certain temperatures?

I have a HP Pavilion m8147c Media Center with AMD Atlon 64 X2 Dual Core Processor 5600+ 2.80 GHz 3GB Ram and when running lately the monitor has started to go into sleep mode or something.Sometimes there is a warning that says something like no signal from DVI and one more but doesn't stay on long enough to read it all.I am running Vista Home Premium 32 bit.I had just installed a new game but pretty sure that has nothing to do with it as I used System Restore and backed up to a time before it was installed.At first it was only when playing games but now it happens with hardly anything running.This pc was bought in july 2007 and I have another desktop but I let my wife use one and I use the other.I opened the case and cleaned out all the dust but noticed when I started it up again the fan is not running on the video card.I don't know if it comes on at certain temps or runs all the time but I feel this is the problem.It has been on for about an hour and not come on at all.Any information will be appreciated.
This question was solved.
View Solution.

captna wrote: Thanks Hanspuppa for the help you've given.I have two more questions.Why do I need the NVIDEA drivers when I will be installing a GIGABYTE card,and the Memory Interface on both cards is 64 bit,how does that affect a 32 bit Vista operating system?Just curious as I have never had any dealings with a video/graphics card before and I would think that it should be a 32 bit but since the GeForce 7350LE is also 64 bit it obviously works..I really appreciate the links and I am ordering the card now,thanks again you.For some reason I am not getting email notices when you reply but I am checking back every so often to see.
Hello captna, Usually when you purchase a new video card or other hardware device, the drivers that are included on the CD are an older version, sometimes as much as six months old. The chipset on any Brand of a given model would be either an Nvidia or an AMD ATI.
The chipset is the main component of the video card that controls most of the operations of the video card.
Since all the manufacturers of the Nvidia video cards use the chipset purchased from Nvidia, they are all the same chipset for any particular model. The different manufacturers can and do add or enable features for their particular cards, but the chipset is still the same.
Since the drivers from the manufacturer would be an older version, and Nvidia releases new versions quite often, it would be best to use the Nvidia drivers, since they would have updated fixes and sometimes features, and added support for some newer cards.
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The higher the number of the Memory Interface, the more data that can be moved in and out of the video card, which results in a faster video performance. This just becomes important when playing games for the most part.
Using the system just for web surfing, emailing and some light gaming, would not have that much effect on the system.
More important to the system would be the amount of video card onboard memory. The Gigabyte has 1 GB of onboard memory compared to your original video card with 128 MBs of memory. This additional memory would likely show a slight performance increase in any light gaming.
You want see much, if any difference in the performance of your system, with the exception of perhaps the light gaming performance increase, with the new Gigabyte video card over the GeForce 7350LE. You should not experience the heat related issue as you had with the faulty fan on the GeForce 7350LE.
You can go into your personal settings on the Forum and select to not receive the email notices when someone responds to one of your post. Several years ago while on the Dell Community Forum, I would receive over a hundred emails every day until I disabled this feature.
Please click the White Kudos star on the left, to say thanks.
Please mark Accept As Solution if it solves your problem.

Fan running all the time on 2010 mba, fan running all the time on 2010 mba

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Fan runs all the time.. Apple Hardware Test Error

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