Torque convertor problem

[GCK]

My 2003 with 212K on the clock has a problem with the torque convertor. Sometimes it will not unlock unless I slip it into neutral. The truck is used mostly for highway use and pulls trailers that weigh less than 9000 lbs occasionally. I have used Amsoil synthetic ATF since the first full fluid change and it still seems to shift fine. I have had the torque convertor lock up solanoid changed and saw no improvement.

I also have an occasional problem with the cruise control cutting off (light stays on on the dash) and I am getting a "lamp out" warning occasionally.

Any suggestions? Could any of these problems be related?

 

[AKAMAC]

I'd say you have a bad solinoid, the TOC one can stick open or closed. Try pulling the codes.

 

[WoodChuck]

Might be an intermittent short or ground. Check the wires going to the AC compressor for wear at the boost tube going to the intercooler.

 

[GCK]

Thanks Akamac and Woodchuck,

I won't get to play with the truck until the weekend but I will check out your suggestions. I have had the solinoid replaced thinking it might be the problem but no change. I am going to go to a autoparts store and get the codes read. I'll also check for a wire shorted out going to the AC compressor. Another thread suggested the APPS might be going out. I'll check that too. Thanks to both of you for the help!