Need to know what these codes mean E98 E91 .EE ..E E52 1991cadillac deville

Question edited for clarity, spelling of the maker, toss in some CAPS and make sentences.
Question moved to model category.

Both are Transmission errors

E-39 Error

https://caddyinfo.ipbhost.com/topic/10886-92-deville-error-code-e39/

and E-98

Diagnostic Code -- E98 Need Help

Cadillac Owners Forum https://www.cadillacforums.com > threads > diagnostic...
Nov 9, 2005 - E98 - High RPM P/N to D/R in ISC Range check your tranny. its sometimes called a VCC overstress error. dont change gears until car is totally ...

Great, now I have MORE trouble codes!! E91 and E98
Aug 7, 2006
Error codes E22, E32 E52 E98 - Cadillac Owners Forum
May 5, 2004
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GM/Cadillac OBD1 Codes E91 & F47

You can do an internet search for the list by looking for Cadillac OBD 1 code list.

Probably two different issues.

The code is saying the computer sees the engine RPM is too high when shifting between park neutral and drive.
The rough idle would be something else.

PRNDL SWITCH PROBLEM IS E91 ACCORDING TO THE BOOK, I LOOKED IT UP IN.

PRNDL stands for Park, Reverse, Neutral, Drive, Low, the same things found on your automatic transmission shifter labels.

The switch is probably bad. Replace it or check connections to it, or check that the Reverse lights go on when the indicator says it is in Reverse on the Dash.

SES light may be on due to this problem.

Maybe not rotated or calibrated right to the shifting positions. I never had this problem in a 1990 Cadillac Deville which is similar to yours.

Good luck.

The E98 is P/N to D/R In ISC (Idel Speed Control) Range problem. This code will not trigger a service light.
The F47 is Refrigerent System Problem. This code turns on the Service Air Cond light, and switched the Climate Control from Auto to Economy.

Sounds like the engine is idling to high. There is a procedure that you must go through to set it. Reply and I will let you know how to set it.

timing should help the idle issue. and the vss probly needs to be replaced.check the egr diaphram its gold and is underneeth the air breather. push up on the bottom of diamphram it should move without alot of efort. if not replace it

the switch on top of the transmission where the shift cable is . it probly is not anny good. check all wiring . make sure thair is no dirt inside the connector

Code 22 OPEN TPS SENSOR CIRCUIT , E 70 INTERMITTANT TPS SIGNAL, E98 DRIVER CAUSED PARK / N TO DRIVE motion by the driver, attempting a shift position, not agreeable with computer. Go figure ! Hope this helps