1999 Lumina 3.1L 4T60E sec gear

butchfig8

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#1
4th vin W, 8th vin M, 145k mi. trans oil changed 80K mi.
Acts like missing sec gear
Code P0742 Torq conv. Lockup stuck, acts like in with wheels off the ground, when brake is applied, kills motor, When easy braking will shift down, not kill motor.
On the road car acts like it is missing sec gear, acts like it is going right into third,
even when shifted mannually. Spd read out looks normal. ???
Auto Enginuity scanner shows it goes to sec gear.
Auto Enginuity scanner Does not show the TCC sol feedback ??
Auto Enginuity scanner cannot fire gear sol ??
Shift solenoids and TCC sol read good 20 ohms, at 7 pin plug.
Could the TCC sol lock in sec gear and act like it is missing sec ??
Do these sol mechanically hang up ??
 
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#2
Yes it can or have a piece of trash or metal shaving in or on it.
First
You need to check the electrical circuit to it for switching on and off.
If scanner will not do it kook up a toggle switch to the TCC circuit.
 

Transman

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#3
You may have more than one problem, Lockup will NOT cause the trans to miss second gear. The biggest problem with this trans, if you need to replace the solenoids or deal with inside wiring, it is almost easier to remove the complete trans then try to remove the back cover to get to the valve body. You need to be sure your problem is inside before you do this though. I recommend ALLDATADIY as it will have photos as well as step by step to pinpoint the defective part(s). It might help to do the basics first, check ALL connections for corrosion, Range switch (Neutral switch), sensors including the MAF, TPS, check the grounds especially at the battery and the ones that connect to the bell housing bolts. GM likes to use the fender for grounds up near the radiator support, check these also. Post back, Transman