I had a 742 code on my daughters convertable - I changed 4 qts of fluid ( which is what came out of the fluid /level plug on the pan -no stick on this one) Seems to be running fine and I'm planning on having the fluid and filter changed. Has anyone experienced this and come out OK without major tranny work. We are also planning on selling or trading the car. Thanks in advance for your help. Dave

Hi Dave, First off welcome to the site! You have come to the right place for any questions regarding your GM vehicles. We have a lot of knowledgeable members here and we will do our best to answer any questions for you and help you solve any problems.

I myself have not run into this code before, but I am sure others will chime in and provide some insight. I would say since the car is running fine/transmission is shifting good that having the fluid and filter changed is a good place to start.

Feel free to browse the site and if you have any other questions don't hesitate to ask.

Is this a standard or automatic? The lack of a dipstick has me questioning it. Yet the code points to an auto, which then has me questioning the lack of a stick.

Its an auto - definately no stick I have the Haynes manual. Thanks

Hmm i didnt know they used a sealed trans on those...interesting Yet your code i beleive is a TCC system stuck on wich means your tourqe convertor cylinoid is/was stuck on i may be wrong

It indeed does not have a dipstick. Here is the filling procedure.

# Let vehicle idle for three to five minutes with accessories off.
# Apply brake
# Move shift lever through all gear ranges, pausing three seconds in each range.
# Place shift lever in Park. Important: Vehicle must be kept level on the hoist.
# Raise vehicle on hoist.
# Place oil container under fluid level screw.
# Remove the fluid level screw with the engine running at idle.
# Fluid level should be at the bottom of the fluid check hole. Because the transaxle operates correctly over a range of fluid levels, fluid may or may not drain out of the fluid check hole when the fluid level screw is removed. If fluid drains through the fluid check hole, this transaxle may have been overfilled. When fluid stops draining, the fluid level is correct and the fluid level screw may be installed. If fluid does not drain through the fluid check hole, the transaxle fluid level may be low. Proceed to ADDING TRANSAXLE FLUID.
# Install fluid level screw. Tighten 12 N.m (106 lb in)

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