2001 deville shifting problems
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2001 deville shifting problems in Past Cadillac Vehicle Discussion; Well i noticed my deville has been starting in 1st gear and skipping 2nd gear and shifts striaght into 3rd. ...
  1. #1
    delatorre1986 is offline Cadillac Owners Member
    Automobile(s): 1996 Deville 1985 Fleetwood
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    2001 deville shifting problems

    Well i noticed my deville has been starting in 1st gear and skipping 2nd gear and shifts striaght into 3rd. If I step on the gas hard to make it down shift it over revs the engine like it was in nuetral, then it finally grabs 3rd again if i leave off the gas pedal. So i have no 2nd gear and no 4th gear I took a fuse out for the transmission and it defaulted it to 1st gear. I think I need a new tranny any thoughts?

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  3. #2
    delatorre1986 is offline Cadillac Owners Member
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    Re: 2001 deville shifting problems

    also if i do need to replace it can i use a older transmission from a 99 deville can I just take out the valve body out of the 2000 deville and put it in the 99 transmission so the connections would hook right up?

  4. #3
    postman2000's Avatar
    postman2000 is offline Cadillac Owners Fanatic
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    Re: 2001 deville shifting problems

    Hello Delatorre.. I was experiencing shiftting problems similar to yours.. A cadillac mechanic i know told me to change the Vehicle Speed Sensor also know as the VSS.. I changed the sensor and have'nt experienced those problems in months.. Its a cheap part.. only like $30 or so.. Its worth a shot.. Also my check engine light was not on.. No code at all for the VSS came up in the current or history codes.. So there dont have to be codes for it.. I just took a gamble and it worked out.. Good luck..

  5. #4
    mhamilton is offline Cadillac Owners Connoisseur
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    Re: 2001 deville shifting problems

    Almost a sure bet you've lost one of your shift solenoids (2nd and 4th). Common problem, not too bad to fix but you do have to drop the pan and the valve body. GM sells a kit with the updated solenoids and improved bracket.

    Here's a how-to with pictures: http://www.cadillacforums.com/forums...ed-sensor.html

    It should have set a code, have you looked at what codes were stored?

  6. #5
    delatorre1986 is offline Cadillac Owners Member
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    Re: 2001 deville shifting problems

    no check engine light no codes that point to a shift solenoid, I did change one of the shift solenoids because i had one laying around from a 99 deville but the other solenoid had a different connector I even changed the fluid the pan had a thick gray sludge on on it i changed the filters also becuase they had little flakes in it. when i took the shift solenoid out i applied 12 volt to them and they clicked. thanks for the suggestions just dont want to throw in another transmission if its not needed. I'll also try changing he vss sensor i think i have one laying around somewhere.

  7. #6
    delatorre1986 is offline Cadillac Owners Member
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    Re: 2001 deville shifting problems

    Well these are my codes
    C1224 HISTORY
    C1248 HISTORY
    B1327 HISTORY
    U1000 CURRENT
    B2767 HISTORY
    P1540 HISTORY
    C0660 CURRENT
    U1040 HISTORY
    B0268 HISTORY
    B0429 HISTORY
    P0151 HISTORY
    P0174 HISTORY
    P0420 CURRENT
    P0532 HISTORY
    P0533 HISTORY
    P1845 HISTORY ( This one maybe be causing the problem)

  8. #7
    mhamilton is offline Cadillac Owners Connoisseur
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    Re: 2001 deville shifting problems

    P1845 - 2-3 Shift Solenoid Circuit Low Voltage

    I don't know with it being a history code, but your problem of missing 2nd and 4th does not sound anything like a VSS problem. Does your speedometer still indicate correctly? It sounds like the textbook definition of the shift solenoid failure. I don't know about the solenoid interchange between years, but I'd just get 2 of the updated ones from GM and replace them both. I can't find the info at the moment, but I know those 2 solenoids control all gears. The different on/off combination of solenoids A and B give you 4 forward gears.

  9. #8
    delatorre1986 is offline Cadillac Owners Member
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    Re: 2001 deville shifting problems

    ok ill call the dealer up and pick them up, rather spend 100 bucks just to make sure before i swap the drivetrain out and spend 700 for a used tranny. The speedo works fine doesnt jump or stop working. When im cruising on the freeway and i let off the gas pedal the car's rpm will drop to about 900 it likes it falls out of gear maybe trying to shift to 4th gear but as soon as i press the gas it bumps into 3rd

  10. #9
    mhamilton is offline Cadillac Owners Connoisseur
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    Re: 2001 deville shifting problems

    I hope that's all it is, sure sounds like the shift solenoids. Not sure about the rpm drop--900 rpm is awfully low (more like the trans is going into neutral... ). Could simply be because the trans is not locking the TCC, it won't do that in 3rd gear, and probably also won't when there are other issues with the transmission.

  11. #10
    wyomingcowboy is offline Cadillac Owners Member
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    Re: 2001 deville shifting problems

    Hey guys newbie here.

    I'm looking ay buying a 2001 Deville from my buddy with transmission problems. I did a lot of searching and found this thread. The transmission in this car drives around town fine but when on the interstate it won't downshift when climbing hills. I drove it once around town but didn't pay attention to which gears were working and which weren't.
    My buddy said that the dealer told him it displayed a code for a certain solenoid in the transmission but he couldn't remember which solenoid. I can go drive it again next week and also pull the codes but I was wondering how I might determine if it is a shift solenoid or one of the others? I know sometimes codes will store for one problem but that isn't necessarily the actual issue.....it might be something else causing that to malfunction.
    He wants $800 for the car and I plan to do the work myself. If I can put under $100 in parts to the transmission I'll come out pretty good. The rest of the car is in pretty good shape. It has 202k miles though......
    I'm hoping I can get away without having to buy a used transmission for $500+

    What are your thoughts?

    nate

  12. #11
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 2001 deville shifting problems

    The 2001 drivetrain uses a GM 4T80E transmission - if the car is a Base or DHS it uses an economy final drive of 3.11:1 and that's the transmission that must be duplicated. The unit uses a pair of 1-2 and 2-3 shift solenoids with line pressure control engaging 4th (overdrive at 0.681) gear. The solenoid of which you speak - highway loads - is the TCC system - Tprque Converter Clutch. At road load speeds above about 43 mph the TCC engages a viscous clutch in the torque converter to remove most of the last 300 or so rpm of slip between the stator and rotor.

    To test the TCC, moderately accelerate through the 4 gears, to about 50 mph....... as you ease off the gas to maintain cruise speed you should hear/feel/see the rpm drop slightly. OK ?? If so, maintain speed with your right foot and touch the brake pedal with your left foot - the brake switch affects TCC and Cruise Control engagement....... as you touch the brake pedal you should hear/feel/see the rpm rise a few hundred rpm. OK ?? release the brake pedal and TCC should engage again. it should take only moderate GAS pedal pressure, for acceleration or passing, to also drop out TCC during the period of power demand.

    The car has its own built-in diagnostic code scanner/memory. Study the proper year/model group in the "How to pull codes" sticky just above. P 1860 (either Current or History) is the TCC operating solenoid. IF the car is not subject to emissions you can live with the extra 300 rpm and loss of about 1.5 mpg highway....... but the TCC is an emissions system and the car must pass federal emissions to be sold legally.

    To reiterate: You should feel 3 very distinct gear changes during acceleration with a gentle rpm decrease above 43 mph as you ease off to cruise gas pedal.

    Heres's a table of car speeds vs. rpm with TCC engaged. (Remember - the base Devilles are speed limited to 112 mph, so disregard the 3.11 graph above that speed)

  13. #12
    wyomingcowboy is offline Cadillac Owners Member
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    Re: 2001 deville shifting problems

    Well I bought the car for 700 today and drove about 40 miles home. Some Interstate and some not. It seems to drive fine to me.....
    What I did notice is that around 75mph and climbing a hill it does downshift but it kinda "surges" a little. The tach goes no higher than 3200 RPM and it acts like there is not much power. It acts like a governor does except instead of limiting mph it limits rpm.

  14. #13
    stoveguyy is offline Cadillac Owners Connoisseur
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    At 75mph, your rpm should be 2k. No OD means you should be at 2600?

  15. #14
    wyomingcowboy is offline Cadillac Owners Member
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    Re: 2001 deville shifting problems

    It is around 2k when cruising at 75. I can see and feel it drop. It's the downshift and surging that I experience. It doesn't want to go any higher than 3200 rpm at those hwy speeds. It will go to 4600 rpm in the lower gears though.

  16. #15
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    And if you floor it from a stop, will it hit the redline? Low power and limited RPMs sound like a clogged cat.

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