2001 Cadillac Deville tcc stuck open code

EMERJOH

MEMBER
2001 CADILLAC DEVILLE
V8
FWD
AUTOMATIC
107,000 MILES

I just bought a deville and had a lot of work done on it but the check engine light is on and its the tcc stuck open code my mechanic tested the whole system related to this and it came up clean he said that the tcc runs the overdrive by opening and closeing he checked it and it works it also grabbs overdrive on the freeway when plugged in to a handheld they did a tranny tuneup also the light remains

3 Replies

FACTORYJACK

EXPERT

I believe you would be referring to p0741 TCC stuck off. This usually sets when the slip speed is high when TCC is applied. It is not just an on/off system, it is what is referred to as pulse width modulated, or variable. Often times there is leakage in the hydraulic circuit. The chosen repair is to replace the converter, tcc pwm solenoid, and all of the seals in the hydraulic circuit. There are two seals in the case cover, one on the drive sprocket, and the turbine shaft o-ring.

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Sunday, February 28th, 2010 AT 10:25 PM

EMERJOH

MEMBER

The mechanic had tested the slip and said its under 100 which is good they also said that the lower valve body usualy goes on these trannys also. So I should replace that, but I cant find that part in any parts listings, I found the tcc pwm soloniod for $40 and im going to fix it myself is there any thing I should be doing to ensure the light stays off after reparis?

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Monday, March 1st, 2010 AT 10:55 AM

FACTORYJACK

EXPERT

First of all, what is the code, is it a p0741? To make sure the light stays off, you need to do a complete repair. The lower valve body has no pertinence to the TCC circuit on this trans, it is all in the upper valve body. You are going to be in pretty deep to just do a solenoid. If it is a 741, high slip speed has been seen at one point or another, I would not remove the trans without completely resealing the hydraulic circuit and replacing the torque converter, especially since you are over 100k miles.

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Tuesday, March 2nd, 2010 AT 11:49 PM