850 Cars: - Speedo stopped working.

Gary Byrne · Aug 7th, 2019, 14:38

Hi guys. The speedo on my 850R stopped working today after a short trip. I don't know if it's related but a month ago my ABS and traction control dashboard warning lights lit up. I now have a good replacement ABS module which I'll be fitting soon. Are these issues related and if not does anybody have a pointers towards the likely cause of my non working speedo? Thanks

cyclogenesis · Aug 7th, 2019, 14:50

There is a little tiny plastic cog that breaks. Its a cheap fix if you so it yourself. There are to do guides on here and elsewhere. The tricky thing will be getting hold if the new cog. Mine came from Germany.

volvobysea · Aug 7th, 2019, 15:09

Hi I had a similar problem on an 850, speedo stoped working as well as abs light on.
Turned out to be worn ignition barrel, just turned key back after starting and speedo, abs started working normally.

volvo again · Aug 7th, 2019, 16:46

As the abs light was on and the speedo gets it's signal from the front wheel abs sensor, through the abs module, it's probably module that causing the non working speedo...if that makes sense.

ksmi · Aug 7th, 2019, 18:25

Quote:

Originally Posted by Gary Byrne

Hi guys. The speedo on my 850R stopped working today after a short trip. I don't know if it's related but a month ago my ABS and traction control dashboard warning lights lit up. I now have a good replacement ABS module which I'll be fitting soon. Are these issues related and if not does anybody have a pointers towards the likely cause of my non working speedo? Thanks

Evening Gary,If your abs module fails to rectify your problem, or even before you swap them, try moving your ign,key about, Fractionally, in the lock,and you may find you can get things to work and warning light(if any) to go off. If this is the case,I think you will find replacing the back half (electrical) of the ign. switch might well solve your probs.

Regards,Keith.

amazondean · Aug 8th, 2019, 09:52

Quote:

Originally Posted by cyclogenesis

There is a little tiny plastic cog that breaks. Its a cheap fix if you so it yourself. There are to do guides on here and elsewhere. The tricky thing will be getting hold if the new cog. Mine came from Germany.

That is when the odometer stops working!

Aug 7th, 2019, 14:38	#1
Gary Byrne Member Last Online: Mar 3rd, 2024 12:26 Join Date: Jun 2011 Location: Alresford	Speedo stopped working. Hi guys. The speedo on my 850R stopped working today after a short trip. I don't know if it's related but a month ago my ABS and traction control dashboard warning lights lit up. I now have a good replacement ABS module which I'll be fitting soon. Are these issues related and if not does anybody have a pointers towards the likely cause of my non working speedo? Thanks

Aug 7th, 2019, 14:50	#2
cyclogenesis Senior Member Last Online: Mar 14th, 2024 07:29 Join Date: Nov 2004 Location: Portsmouth	There is a little tiny plastic cog that breaks. Its a cheap fix if you so it yourself. There are to do guides on here and elsewhere. The tricky thing will be getting hold if the new cog. Mine came from Germany.

Aug 7th, 2019, 15:09	#3
volvobysea Junior Member Last Online: Feb 29th, 2024 15:08 Join Date: Nov 2011 Location: St Agnes,Cornwall	Hi I had a similar problem on an 850, speedo stoped working as well as abs light on. Turned out to be worn ignition barrel, just turned key back after starting and speedo, abs started working normally.

Aug 7th, 2019, 16:46	#4
volvo again Master Member Last Online: Yesterday 17:46 Join Date: Jun 2018 Location: Presteigne, mid Wales	As the abs light was on and the speedo gets it's signal from the front wheel abs sensor, through the abs module, it's probably module that causing the non working speedo...if that makes sense.

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