Where is the GM trans Pressure Control Solenoid ?

Dear Christophe:

I also own a 2000 Venture with the same problem. The pressure switch is inside the transmission and you are looking at about $30 part and $750 labor charge.

GM will not help you on this COMMON problem.

Changing the trans oil a number of times does not help, I have tried that!

I understand "dirt/varnish" builds up in the pressure switch which keeps it from working correctly.

When the trans is cold, it shifts correctly. The problem appears to get worst with heat.

This problem does not cause a trouble light or check engine message to come on. However, if the dealer plugs his GM scanner into your car, THEY can pull a code and will know the pressure switch is no good. When we had our van "scanned" they told us the pressure switch was bad, the good news is the transmission is not slipping.

The dealer also offered us $1,500 on a trade-in. Not a very good investment on our part!

Apparently you cannot "hide" a problem from GM's scanner.

I then made several trips to Walmart and AutoZone looking for a "fix in a bottle". Nothing worked.

A few days ago I ran into a product called "TransTune" for $6.15 with tax. This product was different than the other products I tried. It cleans "gum and varnish".

The directions on the bottles were not clear.

It said "use 1/2 of a can and drive 5 miles" then change the trans oil.

I wanted to use a full can, maybe more than one can! I called the company. The guy I talked to was the son of the original inventor. I told him I wanted to use more than one can to "really clean the pressure switch out". He would not even let me use a full can, just

1/2 of a can.

Within the first mile I could not believe how well the trans shifted! It has never shifted so smoothly!!!!!!!

I then jumped hard the gas and the trans still shifted smoothly.

Since I have added the product, we have not encounter any hard shift and the problems appears to be FIXED.

Best $6 I have ever spent!!!!!!!!!!

If the trans oil needs to be changed, use a 1/2 can, drive a week, replace the oil and filter and then but the other half of the can into your trans.

The details on the product can are as follows:

Brand: Seafom Product name: TRANSTUNE Sea Foam Sales Co. PO Box 5178, Hopkins MN 55343

If it works on your van, spread the word.

Regards,

Steve

You need to remove the case side cover.........

OK thank you for the advice. Anyway, check this out

Chris