GM Repair Problems? Ask GM Repair Expert Now.
The fix for this common problem is to replace the transmission pressure control solenoid. This solenoid is located on the valve body. Remove transmission pan to replace the solenoid.
Is there some additional information you need about the suggested repair?
I understand that you are wary after having been given incorrect advice. This is a common problem and most of the time replacing the pressure control solenoid will fix the issue. This is something I have experienced and repaired on a personal vehicle, as well as on customer vehicles. If replacing the solenoid does not fix the problem then you have a mechanical issue (pump failure, input clutch failure, etc.) inside the transmission that would require a teardown and rebuild to fix. So replacing the solenoid is the only practical do it yourself type repair that can be attempted.
Yes, I do agree. The solenoid warms up and loses its effective ability to regulate pressure and the transmission stops pulling. This is what typically happens. After a cool down, it works again for a very short time.
See attached picture. Does the solenoid hit against the 1-2 accumulator when you attempt to remove the solenoid?
Yes, it is okay to remove the accumulator. Just remove the 3 bolts and reinstall it when you are done with the solenoid replacement.
I would not worry about the metal fragments. Changing the fluid should not harm anything. If the old fluid is very old, the solvent in the new fluid can soften seals, potentially causing leakage in the seals. Transmission additives would only add to that problem. I would suggest just using new fluid.
If you place the gear selector in Low 1 range, does the vehicle move forward?
You are correct. Since you still have reverse, it looks like the pressure control solenoid is doing its job, but something internal had a mechanical failure when you had to quickly accelerate. Unfortunately this is not something that can be fixed externally. You will need to either rebuild or replace the transmission.
Yes, you should. There must have been a weak component inside the transmission that gave way when this occurred. It is not the fault of you or the quick acceleration.