1994 Cadillac Deville OBD code P059

[jmontgomery]

I have a 1994 Deville with just over 76,000 miles. The car runs and drives fine, however after about a 15 minute drive the service engine soon displays on the message center. When I check the OBD it says P059 current code. What does this mean? I check the code list and it says trans input temp sensor? How can I fix it or stop it from lighting? Should I take it to the dealer? Cost? Is it bad to drive the car?

[Dave Shepherd]

Tran temp sensor is bad or the wiring is open.

[jmontgomery]

Is that a difficult repair?

[jmontgomery]

I have been searching the inter-web and saw that there was a recall on this part early in the life of the vehicle. Does any one have any info on this recall?

[Eric DeVirgilis CLC# 8621]

Jeff, I found this posted on the other Cadillac site. (*I copied it to save you the trouble of going to that site which takes forever to load the page). Unfortunately it does not make for very pleasant reading.

I can just about guarantee you there will be no way of preventing the message from appearing on the dash - short of repairing the problem.

HTH, Eric

Not sure of your source for code info....but....in my material and memory a P059 is the code for the transmission/transaxle temperature sensor signal circuit being open....

Unfortunately, if it is the temperature sensor itself it is located under the side cover of the trans which generally necessiates removing the trans from the car to service.

Not postive of the wiring colors but you can check the trans temp sensor circuit at the 20 pin connector to the trans. My quick reference shows it to be the yel/blk wire -terminal M (high) and the blk wire - terminal L (low). The sensor is a thermister that has high resistence when the trans fluid is cold and the resistence decreases when the trans gets hot.

You can check the trans connector for bent pins, corrosion, trans fluid, etc. and clean and repair as required. Check across pins M and L of the trans for continuity and resistence with a VOM.

[jmontgomery]

Thanks Eric... sounds like it is a job for the Caddy dealer. The car is to nice to get rid of. Hoping maybe it is a loose connection. Maybe from an engine power wash before I owned the car.

Jeff