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motheman

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the o/d in my 1996 deville was slipping i changed fluid and now it will not go into o/d all the othe gears work fine,also the service trans light came on along with the service engine light .any suggestions

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Check your codes with your on board diagnostic computer and post them here, if you do not know how to retrieve the codes let us know, you DO NOT need a scanner

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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ok pulled up these codes: IP1552-no RFA Codes-PCO603-

PCM Codes?NO PCM-No RFA- No SPM-No ACM PCM Codes clear

P0603 - Control Module Long Term Memory Reset

B1552 - Keep Alive Memory (KAM) Error

If you are not getting a tranny code its possible that the problem is mechanical, have you smelled the tranny fluid to see if its burning?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Check the adjustment of your brake switch, its possible that it is maladjusted and stopping the OD from kicking in

When you changed your fluid, did you pull the pan? What did you find in the pan?, how was the fluid when you changed

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Check the adjustment of your brake switch, its possible that it is maladjusted and stopping the OD from kicking in

When you changed your fluid, did you pull the pan? What did you find in the pan?, how was the fluid when you changed

i pulled the pan.bottom of pan was clean as well as trans.fluid.the filter screens were as good as the new ones i put in.how do i adjust the brake switch?

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Is it that it is not engaging or is it that it is slipping and the RPMs rise with no 'pull'

You said slipping

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Is it that it is not engaging or is it that it is slipping and the RPMs rise with no 'pull'

You said slipping

ok here is what happened.couple weeks ago i was driving with trans in o/d. traveling alone about 50 mph and it was like it went in neutral,rpm went very hi and then it engaged back into gear,went a couple miles and done the same thing.it then felt like it went into 3 rd gear.when i chnged trans.fluid and filters drove it and put in o/d and it stayed in 3rd gear.when i drive it now can put in o/d and it will not shift into that,it runs fine in 3rd gear no slipping or anything,just will not engage into 0/d

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I am very surprised that you are not getting a code, this could be a bad torque converter and if it slips it would set a P0741. In addition no TCC codes.

With no burned tranny fluid or codes, I am stumped. Lets see what others say.

Do you notice any buzzing or whining when this happens?

I would avoid using OD, and keep it in 3rd

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I am very surprised that you are not getting a code, this could be a bad torque converter and if it slips it would set a P0741. In addition no TCC codes.

With no burned tranny fluid or codes, I am stumped. Lets see what others say.

Do you notice any buzzing or whining when this happens?

I would avoid using OD, and keep it in 3rd

like i said does fine in 1st 2nd 3rd,just will not engage into o/d.no unusual noises or anything ,checked codes again a few min.ago showing no trouble codes,yea got me puzzled also.

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If it was just not going in to OD, I would say to check the brake switch, but you say its slipping, so its not related to the brake switch.

When the OD is working properly, if you tap the brake it comes out of OD

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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If it was just not going in to OD, I would say to check the brake switch, but you say its slipping, so its not related to the brake switch.

When the OD is working properly, if you tap the brake it comes out of OD

it is not shifting into o/d,i can put it in o/d and it does not slip just wont change into o/d,as i said 123 gears work fine.i just drove it about 50 miles and noticed a big drop in fuel mi. usually it gets about 23 around town and now its around 15 mpg.reverse also works fine.if it was the convertor it should slip in any gear,its not slipping at all. how do i check the brake switch.

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If it was just not going in to OD, I would say to check the brake switch, but you say its slipping, so its not related to the brake switch.

When the OD is working properly, if you tap the brake it comes out of OD

it is not going into o/d.no other gears are slipping.1-2-3- and reverse work fine.just a drop n fuel mileage

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I am a bit confused, based on what you said previously its slipping,

i was driving with trans in o/d. traveling alone about 50 mph and it was like it went in neutral,rpm went very hi

That is not a good sign and the brake switch will not cause that

A lack of OD should not drop your MPG from 22 to 15. What RPM are you running at 60 mph?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I am very surprised that you are not getting a code, this could be a bad torque converter and if it slips it would set a P0741. In addition no TCC codes.

With no burned tranny fluid or codes, I am stumped. Lets see what others say.

Do you notice any buzzing or whining when this happens?

I would avoid using OD, and keep it in 3rd

like i said does fine in 1st 2nd 3rd,just will not engage into o/d.no unusual noises or anything ,checked codes again a few min.ago showing no trouble codes,yea got me puzzled also.

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How did you change the fluid? Were the filters changed also?

Did you take it to a shop that flushes the tranny?

It is odd that your tranny would be worse after a fluid change

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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was driving car this morning,still does fine in 3rd gear but checked codes,it gave me a p0741 ,what does that mean? thanks for all your help

Interesting, did you notice that I mentioned P0741 above (Post #13), BEFORE you got this code?

It means that the torque converter is slipping more than it should. Hmmm

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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How did you change the fluid? Were the filters changed also?

Did you take it to a shop that flushes the tranny?

It is odd that your tranny would be worse after a fluid change

i got a electric pump and sucked all the fluid out of thr resevoir and then dropped the pan draining the rest of the fluid,removed the 2 screen filters and replaced with new ones,bolted the pan back on and refilled with clean fluid to proper level,drove the car and noticed it would not shift into o/d.

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was driving car this morning,still does fine in 3rd gear but checked codes,it gave me a p0741 ,what does that mean? thanks for all your help

Interesting, did you notice that I mentioned P0741 above (Post #13), BEFORE you got this code?

It means that the torque converter is slipping more than it should. Hmmm

if the convertor is slipping would it not do it in all the gears,1st -2nd and 3rd gear and reverse work fine,just will not shift into o/d.

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