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1995 seville trans problem

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I have 1995 seville sls with trans problem 52 k on odo. Code po86 appears on onboard diagnistics, and shifts hard and late into gear and when changing gears.All 4 gears engage. It is rebuild unit i bought the car used.

When i clear codes (sometimes during driving ) it will shift normally but when i come to a stop and start driving again MIL comes on and shifts late and hard into second and so forth.

Car is currently in Poland and i am looking to keep the car for a while. Some years go i used to work as a mechanic for Polkowitz Cadillac in NJ (15 yers ago).

If any one has some guidance i d appreciate it much.


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P086 (E086) ................... Undefined Gear Ratio (Transmission Pressure Control)

Are there any other codes? Look for P028, P029, P076, P089, or P094

See this thread


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 just found out replacement transmission was from sts model and mine is sls. Different ger ratios or different final drive would make ecu go crazy and think that tranny is screed up? If that is the case can I swap ecu from sts to sls?

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Transmissions need to be from the same model...

I don't think swapping the ECU is gonna fix the problem...

Someone with more knowledge than I will say for sure.

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