Volvo AWD 850 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 12/2012 850 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

Crazy shifting when in OD mode 850 1995

posted by  someone claiming to be Bob_Watson on  Mon Dec 2 08:16 CST 2002 [RELATED]

My 95 850 has started shifting crazily by itself. Up and down, whenever it feels like it. Not nearly as bad when in "3". Worst if in OD and use cruise control to accelerate. Relay? Solenoid? New tranny???








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Crazy shifting when in OD mode

    posted by  Erwin on  Tue Dec 3 06:04 CST 2002
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Thu Oct 23 10:39 CST 2014
    [RELATED]

    Two free things to try right off the bat are excercising the Mode and PNP switch. The Mode switch is the selector near the shifter for Econ/Sport/Winter. Rock it back and forth a few times. It should feel crisp and not just wallow back and forth.

    The other is the PNP switch on the tranny. With the engine off run the shifter back and forth from P to L about twenty times. This wipes the contacts on the PNP switch. Do these one at a time. When driving the car, while stopped, rock the Mode switch back and forth about 10 times then drive. If the problem is still there, pull over stop the engine and try the other. I'd bet it clears up. Colder weather seems to bring out problems with worn PNP switches.

    If you're a DIY type, the replacement procedure is at:

    http://www.volvospeed.com/Repair/pnpswitch.htm

    Good luck and DON'T flush your transmission! If the fluid hasn't been changed recently I'd recommend that it be done but DO NOT POWER FLUSH.
    --
    Erwin in Memphis, '95 855t








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      run the shifter back and forth 850 1995

      posted by  someone claiming to be MAD on  Wed Dec 4 13:03 CST 2002 [RELATED]

      Erwin,

      I was having the same trouble that Bob posted. I went out and tried the "shifter back and forth" idea on my car. Now it won't start. Please HELP!







    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      Crazy shifting when in OD mode

      posted by  Bob_Watson on  Wed Dec 4 04:30 CST 2002
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Sun Oct 7 13:42 CST 2007
      [RELATED]

      OK...I shifted back and forth the 20 times before heading out this am, and only had one sticky downshift. No problems when on the interstate, but I did not try the cruise cntrl. I'll try that on the way home...if the roads are not too icy. Any idea why a sticky PNP causes crazy shifting? Why will new trns fluid help?

      thanks a million...Bob







<< < > >>



©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.