What size heatsinks do I need for CEM?

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R

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volvodork
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What size heatsinks do I need for CEM?

Post by volvodork »

Finally happened to me on hot/humid day on drive to work: Limp mode which went away after car cooled off for drive home. Pretty sure it's the 2001-2204 CEM overheat issue and want to do the chip heatsink and shield removal. I think the size for the big chip is 22mm as mentioned in posts, but what is the size for the flash chip others have mentioned but didn't see a size for it. Want to do both while I'm in there. Might even put in the box fan for good measure since it's already exhibited problems.
Thanks for the great inputs!
J.D.

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volvolugnut
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Post by volvolugnut »

Did you get codes when went into Limp mode? I have been having limp mode on hot days on 2001 V70, have not heard that 2001 models had known CEM over heat issues. My codes indicate a problem with Canbus signal to ETM.
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

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volvolugnut
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Post by volvolugnut »

For heat sink size and details see:
https://www.volvoxc.com/forums/showthre ... 04-CEM-CPU
Lots of info here on what and where to buy.
For my situation, after many times of hot start failures and limp mode, I will be getting Xemodex to remanufacture my CEM. Today it failed to idle without surging after cooling over night at CEM temperature of only 74F. I removed the CEM this morning and contacted Xemodex.
volvolugnut
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

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abscate  
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Post by abscate »

Thanks for digging up that’s post, lugnut
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