Volvo AWD 850 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 5/2002 850 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

abnormal downshifting at highway speeds 850 1994

posted by  60cents on  Mon Oct 23 16:44 CST 2006
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Feb 20 08:03 CST 2009
[RELATED]

For the second time I've experienced an unusual downshift with my turbo wagon.
While traveling uphill ( I live in the mountains) the tranny downshifted into 3rd gear at about 50 MPH.
After slowing down to around 40 MPH it again downshifted to 2nd and would only upshift when the RPM's reached 4000+
After about 10 0r 15 miles like this, it downshifted to 4th and operated normally for the rest of the trip.
It feels like the transmission mode switch was changed to sport mode from economy.
However, changing the settings on that switch made no difference.
Both times this happened I was driving uphill after having driven to a lower elevation and returning home to a higher elevation.
Could this be a sign of a bad mode switch or a bad tranny solenoid??








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    abnormal downshifting at highway speeds 850 1994

    posted by  someone claiming to be fixit2003 on  Wed Oct 25 07:56 CST 2006 [RELATED]

    Good tranny info at: www.babcox.com/editorial/ic/ic40238.htm








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    abnormal downshifting at highway speeds 850 1994

    posted by  someone claiming to be ksg on  Tue Oct 24 02:46 CST 2006 [RELATED]

    Did you get a trouble code (check engine and/or flashing arrow)?








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      abnormal downshifting at highway speeds 850 1994

      posted by  60cents on  Thu Oct 26 13:56 CST 2006
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Fri Feb 20 08:03 CST 2009
      [RELATED]

      No TCU (A1) codes yet.
      The CEL is on but for A2, 535 and 413
      I think those are separate issues








      •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

        abnormal downshifting at highway speeds 850 1995

        posted by  HO on  Fri Oct 27 07:14 CST 2006
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Tue Aug 12 14:01 CST 2014
        [RELATED]

        Another area that you might want to look at is the TPS. I had similar issue during highway speed and no code was logged. It turned out to be a bad TPS.

        Ching-Ho Cheng
        --
        1995 855 NA, Bilstein Strut & Shocks, Volvo Protective Grill, K&N Filter, E-Code Lens, ClearCorner Light, Alpine CD-Changer, AutoDim RearView Mirror, 6000K HID








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    abnormal downshifting at highway speeds 850 1994

    posted by  MadeInJapan on  Mon Oct 23 17:07 CST 2006
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sat Oct 2 06:34 CST 2010
    [RELATED]

    I'd say it's time for a tranny fluid flush.
    --
    1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      abnormal downshifting at highway speeds 850 1994

      posted by  60cents on  Mon Oct 23 17:13 CST 2006
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Fri Feb 20 08:03 CST 2009
      [RELATED]

      Maybe but I don't think so
      The guys at the jiffy lube looked at it and said the color was good and it didn't smell burned although it did have a funny smell.
      Someone may have added something to it.
      I'm thinking it is an electrical problem.
      No codes though








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        abnormal downshifting at highway speeds 850 1994

        posted by  MadeInJapan on  Tue Oct 24 16:45 CST 2006
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Sat Oct 2 06:34 CST 2010
        [RELATED]

        I would never take my car to a Jiffy Lube or trust anyone's opinion who works there. Most of these guys are taught the bear minimum. I know circles more than they do about most cars and that's not much.

        If you search here you can read many Jiffy Lube, Bubba Lube, etc. horror stories.
        --
        1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.








        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          abnormal downshifting at highway speeds 850 1994

          posted by  60cents on  Thu Oct 26 13:58 CST 2006
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Fri Feb 20 08:03 CST 2009
          [RELATED]

          Gotta trust someone.
          Since these guys are my "neighbors" I'm not too concerned about their qualifications.
          Especially since I also know something about tranny fluids.
          Changing fluids can't hurt thogh and I may do that anyway.
          But I'm not too optimistic about solving the problem with that








        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          abnormal downshifting at highway speeds 850 1994

          posted by  metabolite on  Wed Oct 25 12:54 CST 2006
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

          Its simply called the need for a GEAR POSITION SENSOR-








          •   REPLY TO THIS MESSAGE    PRINT   SAVE 

            abnormal downshifting at highway speeds 850 1994

            posted by  60cents on  Thu Oct 26 13:54 CST 2006
            Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
            last visit: Fri Feb 20 08:03 CST 2009
            [RELATED]

            Thanks for the thought.
            I've replaced the gear position sensor b4 on another 850.
            So I'm familiar with the process.
            I would try cleaning the contacts first and look for a code before replacing the sensor.
            Since I'm not getting a code, yet, think I will wait on the replacement







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.