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Transmission not catching any gears until Tcm is reset

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

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Transmission not catching any gears until Tcm is reset

Post by Vancethevolvo » Thu Mar 30, 2017 10:18 pm

I have a 1998 Volvo s70 GLT auto transmission. I started having the flashing arrow light about a year ago, I pulled the speed sensor on top of the transmission and cleaned it with brake cleaner, stuck it back in and never had a problem again for about 10,000 miles. A week ago it started flashing again so I tried the same thing, it worked for a couple of days but now on my way home tonight. The car wouldn't catch any gears including reverse, I disconnected the battery and reconnected it and it drove fine for about two miles and slipped out of gear....I did the disconnect and reconnect again and it quit slipping for another two miles. Any suggestions?

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Re: Transmission not catching any gears until Tcm is reset

Post by jreed » Sun Apr 02, 2017 6:19 am

I haven't experienced this problem and I have a different car ('97 855 GLT), so I don't know how to fix the problem you're describing. A couple of questions occurred: does the level and color of the transmission fluid look good? is there a way to read the codes from the TCM to see what it thinks the problem is?
Good luck!
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

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Re: Transmission not catching any gears until Tcm is reset

Post by wizechatmgr » Sun Apr 02, 2017 6:35 am

If it were me I'd start by swapping that sensor out to see if anything changes. It could be your sensor is going - but it also may not be.
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~190k miles

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