To replace the solenoid you will need to get into the trans. I do recommend having a mechanic do it. However, I also recommend a second opinion due to price. Although I feel he is most likely correct, I can't see having to pay more than $400.00 for the repair.
Also, I did a little research for you. I found this is a common problem and the solenoid has been redesigned. Also, here are some other things that could cause the problem:
Sediment inside the pressure control (PC) solenoid valve, causing the PC solenoid valve to mechanically bind.
Sediment in the valve body, causing the torque signal regulator valve to stick.
Incorrect transaxle oil level.
If you have the trans powerflushed, it may help. In the Pittsburgh area the average cost would be around $100.00
I hope this helps you. If you have any other questions, let me know.
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Monday, November 10th, 2008 AT 5:52 PM