TCC starts locked - stays locked
#1
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Join Date: Jan 2004
Location: Poquoson, VA
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TCC starts locked - stays locked
Any ideas what would cause TCC to lock up all the time. This literally happened overnight. One day the truck shifted just fine. The next time I drove it the TCC started to lock up and would not unlock - no matter what gear or speed. Fortunately, I did make it home in one piece. But now the engine will stall immediately once I shift into R or D. Total no-go.
I checked all of the ground wires that I could find. I did install a mystery switch a LONG time ago; it has always functioned correctly. Just want to see if there might be a ground/wire that I've missed OR if maybe a solenoid in the VB is stuck...
Thanks in advance for any helpful ideas!
I checked all of the ground wires that I could find. I did install a mystery switch a LONG time ago; it has always functioned correctly. Just want to see if there might be a ground/wire that I've missed OR if maybe a solenoid in the VB is stuck...
Thanks in advance for any helpful ideas!
#2
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Pull the TCC/OD connector at the trans and see if it still does it. They operate by bringing in the solenoid to ground instead of adding the 12V. If you have a wire touching ( not the 12V feed ) it will act as if it is applied.
#3
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Thanks for the idea...
Pulled what I thought was the TCC/OD connector (the other was for ATF temp), but still stalled when I shifted into D or R. I need to find my shop manual - in a box somewhere after my move.
Pulled what I thought was the TCC/OD connector (the other was for ATF temp), but still stalled when I shifted into D or R. I need to find my shop manual - in a box somewhere after my move.
#5
did you get this fixed? mine just started doing the same thing! I unplugged the tcc/od and no change. the engine surges and tries to die when I put it in R or D. I have the service manual but I can't find a test for the solenoid! any help would be greatly appreciated!! I did finally add a drain plug to the trans pan so I guess some good came from this
#6
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Andy, test is done running using a DRB to toggle on and off, not sure if any aftermarket scanners support it or not. When I lost my TC LU, Dave Goerend had me grasp the trans cooler rubber lines and feel for it pulsing while my buddy toggled it with the DRB.
You could do a similar thing by getting a trans connector, and hooking it up to 12V and a manual switch on the ground.
Lot more hassle, but cheaper than a 3K DRB.
You could do a similar thing by getting a trans connector, and hooking it up to 12V and a manual switch on the ground.
Lot more hassle, but cheaper than a 3K DRB.
#7
Any ideas what would cause TCC to lock up all the time. This literally happened overnight. One day the truck shifted just fine. The next time I drove it the TCC started to lock up and would not unlock - no matter what gear or speed. Fortunately, I did make it home in one piece. But now the engine will stall immediately once I shift into R or D. Total no-go.
I checked all of the ground wires that I could find. I did install a mystery switch a LONG time ago; it has always functioned correctly. Just want to see if there might be a ground/wire that I've missed OR if maybe a solenoid in the VB is stuck...
Thanks in advance for any helpful ideas!
I checked all of the ground wires that I could find. I did install a mystery switch a LONG time ago; it has always functioned correctly. Just want to see if there might be a ground/wire that I've missed OR if maybe a solenoid in the VB is stuck...
Thanks in advance for any helpful ideas!
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#8
thanks for the info!! I pulled the solenoids off and put voltage on them one at a time. I don't here a click or anything. I do have 30 ohms on the coil so I know they're not open.
Unless something changes I plan to pull the valve body and clean and inspect all the valves and springs. hopefully I find something.
Unless something changes I plan to pull the valve body and clean and inspect all the valves and springs. hopefully I find something.
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