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2004 V70R auto 3rd gear sometimes dropping

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nofro
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Year and Model: 2004 V70R
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nofro

2004 V70R auto 3rd gear sometimes dropping

Post by nofro » Mon Apr 29, 2019 11:57 am

I have a pretty new-to-me 2004 V70R with an automatic transmission, getting close to 190k miles. Ive been looking on this site since before purchasing the car and it has been a great resource. Hopefully someone here can help with diagnose a tranny issue I've been having.

The problem: A few months ago I noticed that sometime when slowing down to make a turn, when I hit the gas to accelerate it would drop out of gear as if in neutral, then slam back into gear.

I tried flushing the fluid (which was pretty brown) and changed the servo cover while I was at it. Not much (if any) effect.

I began driving in GT mode, manually shifting. This worked pretty well to avoid the downshifting/drop down from the auto and was almost able to avoid the issue altogether, but I found out a little more:

-Most of the time, all gears behave normally
-It drops to neutral without changing gears, with the selector in 3rd gear (or when it downshift as initially discovered)
-It happens when accelerating from a relatively low speed (low rpm) in 3rd gear
-It can happen at just about any amount of throttle, and catches the gear again when let off the gas
-It seems like it might be related to whatever changes are happening in the transmission as the torque converter locks/unlocks around that rpm range, but I'm not really sure what the trans is doing there.

If anyone has any ideas or experience with this, I would appreciate the help. Thanks!



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RickHaleParker
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RickHaleParker

Re: 2004 V70R auto 3rd gear sometimes dropping

Post by RickHaleParker » Mon Apr 29, 2019 1:38 pm

Exact symptoms of the B4 servo cover issue.
The B4 Servo issues usually does not affect 2004 and newer models but it is not unheard of.
$30.00 in parts and you can change the B4 Servo cover without pulling the transmission.

Last edited by RickHaleParker on Mon Apr 29, 2019 1:45 pm, edited 1 time in total.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

nofro
Posts: 2
Joined: Mon Apr 29, 2019 11:39 am
Year and Model: 2004 V70R
Location: MD
Has thanked: 0
Been thanked: 0
United States of America
nofro

Re: 2004 V70R auto 3rd gear sometimes dropping

Post by nofro » Mon Apr 29, 2019 1:45 pm

That's the best I could figure, so I changed the servo cover and flushed the fluid already but there was no improvement



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RickHaleParker
Posts: 2688
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
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RickHaleParker

Re: 2004 V70R auto 3rd gear sometimes dropping

Post by RickHaleParker » Mon Apr 29, 2019 3:10 pm

There where a number of software updates to fix shifting issues. It does not cost anything to talk to a Volvo Dealer. If your lucky, they might cut you a good deal if the software needs updated.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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