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Volvo 850 tranny problem

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Gdelamare92
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Joined: Wed Nov 06, 2019 12:49 pm
Year and Model: 1996 850 GLT
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Gdelamare92

Volvo 850 tranny problem

Post by Gdelamare92 » Sat Nov 09, 2019 4:09 pm

Ok... so I bought a 1997 volvo 850 GLT 2.5 auto. Without jetronic or motronic. As a non runner(fuel pump and relay had gone)... anyway. Over a year later and many vacuum hoses replaced I now have an issue that just popped up. If I start the car and shift straight to drive it's fine. But if I have to shift into winter, 3 or L then back to D, it gets stuck in what feels like 4th(last gear) and unless I turn the car off and back on again it remains like that. Same thing happens if I select reverse and drive in reverse. All this with the flashing orange arrow on the dash. I went through a deep puddle earlier. I'm thinking maybe the tranny ECU got wet or the plugs got wet...

Any advice welcome

TIA



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jreed
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Year and Model: '97 Volvo 855 GLT
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jreed

Re: Volvo 850 tranny problem

Post by jreed » Sun Nov 10, 2019 7:20 am

The behavior you describe is similar to what happens when the PNP switch in the transmission control circuit fails or gets gummed up. You can sometimes clear this problem by rapidly moving the transmission selector back and forth several times to try to clear up the contacts in the switch. If you search for "PNP Switch" here, you'll find a wealth of information about the problem and methods for resolving it.


1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

Gdelamare92
Posts: 2
Joined: Wed Nov 06, 2019 12:49 pm
Year and Model: 1996 850 GLT
Location: Guernsey
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Great Britain
Gdelamare92

Re: Volvo 850 tranny problem

Post by Gdelamare92 » Sun Nov 10, 2019 7:32 am

jreed wrote:
Sun Nov 10, 2019 7:20 am
The behavior you describe is similar to what happens when the PNP switch in the transmission control circuit fails or gets gummed up. You can sometimes clear this problem by rapidly moving the transmission selector back and forth several times to try to clear up the contacts in the switch. If you search for "PNP Switch" here, you'll find a wealth of information about the problem and methods for resolving it.
Weirdly enough. Started it up this morning... it's fine now. Read the codes. None stored. Must have been a glitch in the matrix.



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Clemens
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Year and Model: 96 855 R + 94 855 T5
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Clemens

Re: Volvo 850 tranny problem

Post by Clemens » Mon Nov 11, 2019 4:21 pm

Gdelamare92 wrote:
Sun Nov 10, 2019 7:32 am
Must have been a glitch in the matrix.
More likely water or dirt getting up to the pnp swirch shorting it our or sthg. Good luck it stays away. If the problwm returns, the PNP is a suspect.


Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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