Transmission issue

JM6342

MEMBER
2004 BUICK RENDEZVOUS

Six cylinder front wheel drive automatic 99,200 miles.
-
The transmission started acting up. I took it to the dealer because it has a warranty that I purchased from a third party company. The dealer checked it and said the transmission was bad and needed to be replaced. The cause I was told was a solenoid had failed and that caused the transmission to fail and according to the dealer parts of the transmission had melted. The warranty company is now denying my claim because they say the cause was electrical and not any of the internally lubricated parts. The dealer has nothing to do with this warranty company. I purchased this on my own.

3 Replies

DENNYP

MECHANIC
1,824 POSTS

The solenoid is an electrical part that controls hydraulic parts. If the electrical part of the solenoid failed and caused the internal parts of the transmission to fail, then it was an electrical failure.

What were the codes?
Which solenoid failed?
Which internal trans parts were damaged as a result?

If you can get this info for me, I might be able to verify if the diagnosis is legit.

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Wednesday, March 19th, 2008 AT 10:15 PM

JM6342

MEMBER
8 POSTS

The computer listed four codes
They were:
P0463, P0520, P0751 and P1811. I was told two of these codes were for fuel level sender and oil pressure switch.

The dealer's paperwork states " Found clutch packs (in transmission) welded together due to sift solenoid shorting out".

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Tuesday, April 1st, 2008 AT 12:47 PM

KRUSZE2

MEMBER
5 POSTS

As a GM Certified transmission tech, I have seen this scenario in the past, the p0751 code is for the first to second shift solenoid. In most cases, it had shorted out, causing the plastic in it to melt and thereby sealing the vent on the solenoid, which in turn caused your hard part failure. I actually have an 2008 Lucurne on my hoist right now that has done the same thing.

Now the p1811 code is for the transmissions pressure control solenoid failing, these are common among the 4T65 transmissions, but they do not cause immediate damage to a transmission, when the P1811 code is set in the PCM, by default the PCM commands the transmission pressures to full. Therefore you may have noticed the harshness in your shifting.

I am assuming you have since had repairs done, in most cases, which GM pricing, it is usually cheaper for a customer who is paying out of pocket to have a SRTA unit installed, which comes with a much better warranty.

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Sunday, April 6th, 2008 AT 11:12 AM