Battery died on my S70 over the weekend. I tried to charge it with cables to my wife's minivan. Car started to crank but wouldn't turn over. When I looked down at the dash, I noticed that the odometer read 999,999 and clock was out. I replaced the battery and when I drove for the first time, speedometer wouldn't work, tach registers high although not revving that high, odometer registers 5/10ths of a mile for every 2/10ths and the ABS/Tracs Off lights are both on. AND the Service light is continually blinking. Tried disconnecting battery for 12 hours but to no avail.

Went to my mechanic who tried to check out thru OBDII but came back with no code errors, nor could he fix.

I assume its the computer and I will have to bring into the dealer. Does anyone have any other ideas? How much do you think this will cost? A fortune I'm sure.

Thanks,
Cliff Wasser
'98 S70 136K mi. ( I think)

Turns out the control module is fried. Mechanic tried with dedicated volvo reader and it couldn;t even identify the part number. Part is $385. Be careful when charging your battery folks. this could happen to you.

did the mechanic say this was a result of you charging it?? I find it ridiculous that this could happen. I'd have Volvo on the phone (not that it would do any good).

Well, best thing I can say is that there is no way you did this by hooking up jumper cables. If your wife's car had put out enough power to do that, than her's would be screwed as well. But, really, if such a phenomenon were to happen, a fuse would go first (unless of course we are talking about lightning-like power here which would just leap across the fuses).

Anyway, this is quite strange, but I agree a bit with the other poster. My car was doing very funky things when something was wrong with the battery. I replaced the battery and everything was fine.

I would go to the store you bought it at and talk them into at least letting you try another one. Just be careful not to ding up the posts so they can put it back on the shelf if it doesn't fix your problem.

Have you tried re-setting the combo/trip computer at the dash? Also, make sure new battery is not a dud. These cars need to have perfect power connections or strange things happen. If in doubt, disconnect the battery again and restart the procedure. If all fails, drive it for awhile and see if anything happens before you seek a dealer. Good luck.