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2006 xc90 v8 awd multiple can bus communication faults

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
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Year and Model: 2006
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2006 xc90 v8 awd multiple can bus communication faults

Post by Hkanitz »

I have owned this vehicle for a couple of years. I bought it for cheap with problems I was sure I could fix. The original problems were traction control, no awd. Now this thing starts up and runs for a few, then loses guages, trans not shifting. After a few times of doing this and starting and stopping it will drive without incident all day. So far, I recently purchased a chinese dice unit and 2014d. I also bought the EWD wiring diagrams. Vida came up with these codes, cem 1a61, 1a62 1a64, 1a5e, 1a5f, df17, and uem ooo4. From what I see, the major one causing my problem is the df17 code. Apparently the can high speed and low speed are shorted together somewhere. I have never seen such a screwed up wiring diagram in my entire life! I am a licensed aircraft mechanic and am certified on most aircraft flying. I would greatly appreciate any and all help finding this short. I am leaning towards the DEM being shorted internally. Could this shut down the can communication?
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Re: 2006 xc90 v8 awd multiple can bus communication faults

Post by RickHaleParker »

Yes a short in one of the Modules can pull down the CAN Bus. If you suspect an internal short in a module, disconnect it, clear codes and see what comes back.

You could narrow down where a short is by disconnecting the CEM then probe the different local circuits.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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