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1996 850R estate - auto transmission module/ computer problem 850

posted by someone claiming to be kroner on Wed May 10 10:37 CST 2006 [RELATED]

Hi
I have an intermittent problem with the auto transmission computer/sensor or module.... I think its the actual computer...well that's what I have been told by a Volvo mechanic. The car is an 850R estate Auto with only 127,000 km on it

What's happening is on some cold mornings the upshift warning light comes on and the car wants to drive off in second or 3rd gear...which makes the clutches slip..and im very concerned when this happens. The problem does go away and the upshift light dissappears and the car is fantastic to drive again.... but unfortunately the problem comes back usually the following morning, when its cold again....damn!!!

The module has been quoted to me as $350.00 Australian and im up for another $200 to fit the new one in. Im ok with the $350, but the $200 to fit its sounds a bit rich. My question is can I replace the module myself???

Can anyone out there tell me if this is any easy replacement job.
Firstly where is the module/computer???
Is it just a plug in once located???
Is it easly located??? Do I have to pull everything apart ot get to it???
Can I fit it myself??
or should I leave it to a pro as it needs resetting or any programming once its been fitted.

I would appreciate some answers urgently as I need to purchase this module before the weekend and hopefully get normal usage of the car, which I love sooo much.

Thank you
Regards
Kroner

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1996 850R estate - auto transmission module/ computer problem 850

posted by MadeInJapan on Wed May 10 13:17 CST 2006
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last visit: Sat Oct 2 06:34 CST 2010

[RELATED]

Here:
http://www.matthewsvolvosite.com/chat/phpBB2/viewtopic.php?t=2378

Bust mostly here:
http://www.volvospeed.com/Repair/pnpswitch.php
--
1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.

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1996 850R estate - auto transmission module/ computer problem 850

posted by someone claiming to be kroner on Wed May 10 13:08 CST 2006 [RELATED]

IS this module called the PNP switch???

Can anyone confirm if this is what I need to replace.
I just did a bit of research and found some info into how to replace this PNP switch

thanks
Kroner

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1996 850R estate - auto transmission module/ computer problem 850

posted by someone claiming to be ksg on Thu May 11 04:03 CST 2006 [RELATED]

The PNP is not a computer module or electronic part - it is just an ordinary gear position sensor/neutral safety switch which is found on all cars with automatic gearboxes. It feeds the information to the gearbox controller, which itself is unlikely to be defective. If not receiving correct signals from the PNP the controller will enter "safe" mode where gears will not change. That protects the gearbox. Your symptoms are entirely consistent with a PNP which is beginning to wear out from use. I have heard it occurs on more than 30% of 850 automatics. It is common on many other brands of car too. I paid about $220USD to have mine replaced. It is an easy job and I would do it myself if it failed a second time. Part is about $110USD.

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