STC, ABS, brake light, transmission fix soon

[JeromyW]

Thanks for the reply. It seems to be shifting smoothly into all 4 gears, though the fluid looks really dirty, so I'm planning on doing a drain, refill, and filter change on the transmission.

It's not displaying any codes.

I'm still unsure what is going on with the "car starts then turns itself off & won't restart" issue. The error code on the dash looks like this (sorry its a little blurry):
https://dl.dropboxusercontent.com/u/19908802/photo.JPG

[JeromyW]

I took it to a local import repair shop where their tests seemed to indicate a faulty abs control module was causing the error messages, and probably affecting the Ignition Immobilizer so that it also would not start. I replaced the ABS control module with one from Xemodex. So far so good.

[Volvo S80]

Most of the errors are caused from Abs control module like speedometer not working, abs light, sunroof not working and lots of other problems.
Solution: Remove the keys from the car let it set for 10 min, be sure that you know the radio code ( if it has one), remove the battery (-) terminal, remove the air box and than remove the module, cut the plastic in module and open it look for crack`s in welding components.It will fix most of your problems the worst scenario you need a new module that is not far away at least you know that u tried to fix it.

Here is a how to remove :

Here is how to try and fix it :

It worked for me hope works for you to.

[JeromyW]

I'm following up with a final update in case others with a 99 S80 have the same issue. Long story short after replacing the ABS control module the symptoms went away for a few weeks, and then returned again. The repair shop ended up diagnosing and replacing the CEM (central electronic module), which I also got from Xemodex with a lifetime warranty. So far so good now.