TC unlocks at 50mph?
Thread Starter
On The Tree
Joined: Nov 2002
Posts: 112
Likes: 0
From: IL.
TC unlocks at 50mph? I had the tuner set the misfire tables as posted. The high tables were not changed. It locks up at 43mph where it is set to. Then once 50mph is reached, it unlocks and won't lock up again for a while. Does this make any sense? 
Originally Posted by darknight
I had the tuner set the misfire tables as posted. The high tables were not changed. It locks up at 43mph where it is set to. Then once 50mph is reached, it unlocks and won't lock up again for a while. Does this make any sense?
I had the same thing to my 2000 c5 might be the tcc actuator in the valve body
TECH Enthusiast
Joined: Nov 2001
Posts: 521
Likes: 0
From: Farmingdale NJ
Check for codes. I had a similar thing happen when my manual valve position pressure switch failed (P1810).
It won't set a MIL but it will get stored in the PCM.
The TC would lock and unlock at any speed over 67mph. The code P1810 also bumps line pressure, so you may be experiencing firmer part throttle shifts than normal.
It won't set a MIL but it will get stored in the PCM.
The TC would lock and unlock at any speed over 67mph. The code P1810 also bumps line pressure, so you may be experiencing firmer part throttle shifts than normal.
Thread Starter
On The Tree
Joined: Nov 2002
Posts: 112
Likes: 0
From: IL.
I will check for codes. It does not lock up after it hits 50 for the first time though. It has to be at a lower speed for a while to lock up again.
It is a vig. 3200 stall. It all worked great before the h/c.
It is a vig. 3200 stall. It all worked great before the h/c.