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Discussion Starter · #1 ·
Hello all -

I hope someone has experienced something similiar and can point me in the right direction......My 850 Speedometer works very sporadically. It will work fine for a day or two, then not register at all. All of a sudden, while driving, it engages and is not always accurate....(i.e., jumps up to 90 mph!) or it works fine. All the while, the odometer/trip odometer work great, as well as the computer speed sensor......In fact, I will reset the speed since 0 occassionally to check how fast I am going, especially around the officers!!


Thanks in advance!
 

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Volvo Guru !
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There might be a short in the speedo cluster circuit board.
 

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Discussion Starter · #3 ·
Tech - Thanks for the reply. I was hoping to avoid pulling the dash apart. :-(

Oh, well, kinda confirmed what I was thinking.....If it was the Speed Sensor on the transmission, then I'd expect the OBC and odometer to be faulty.

Thanks again.
 

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That is what I was thinking as well.If you need good instructions on how to pull it apart let me know and I will send them to you.
 

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I had a similar (but not identical) problem once. Speedometer and Odometer both not working. Apparently it was the ABS Modulator. CHanged to a rebuilt one, and presto!

 
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