Hello folks. I have a 2007 LBZ with 200K. All stock except Banks full exhaust and intake. Looking for some info here to get me going in the right direction.
It popped a check engine light just before making a four hour trip from one property to another late Friday evening. Drove it about 4 miles on some backroads and it is stuck in second gear and the tranny temp gauge never indicated any temp at all (But not sure I ever paid attention to what it normally reads). Manual shift mode does nothing and it only indicates 2nd gear. Reverse works fine. I didn't have my code reader with me and had to jump into another vehicle to make a four hour trip home. I can't pull the codes or troubleshoot right now so I'm trying to do some research before I return to where the truck is so that I have every possible thing I need to fix it.
After looking through a bunch of threads it seems like it is likely a shift solenoid. Seems like a pretty straight forward repair but I want to gather up all the other possible parts I might need it it's something else. I was a Navy electronics guy so I can troubleshoot circuits if needed. Looks like there are some pretty easy resistance and voltage readings that can be done from the TCM to help isolate the issue. I just figured out that my scanner doesn’t read TCM codes anyway so I’ll pick up one that will but I might be able to isolate the issue without it if I had a good schematic.
Questions about parts:
Thank you in advance. Rick (757) 214-5334 or [email protected]
It popped a check engine light just before making a four hour trip from one property to another late Friday evening. Drove it about 4 miles on some backroads and it is stuck in second gear and the tranny temp gauge never indicated any temp at all (But not sure I ever paid attention to what it normally reads). Manual shift mode does nothing and it only indicates 2nd gear. Reverse works fine. I didn't have my code reader with me and had to jump into another vehicle to make a four hour trip home. I can't pull the codes or troubleshoot right now so I'm trying to do some research before I return to where the truck is so that I have every possible thing I need to fix it.
After looking through a bunch of threads it seems like it is likely a shift solenoid. Seems like a pretty straight forward repair but I want to gather up all the other possible parts I might need it it's something else. I was a Navy electronics guy so I can troubleshoot circuits if needed. Looks like there are some pretty easy resistance and voltage readings that can be done from the TCM to help isolate the issue. I just figured out that my scanner doesn’t read TCM codes anyway so I’ll pick up one that will but I might be able to isolate the issue without it if I had a good schematic.
Questions about parts:
- If it is a solenoid, my six speed Allison has 7 total solenoids as far as I can tell. Makes sense to me to replace them all while I’m in there unless someone here thinks that’s a waste of time and money. I don’t know what the life expectancy or failure rate it.
- If I do drop the tranny pan what else would you guys recommend while I’m in there other than the screw on filter and the shallow filter?
- Any particular brand of transmission fluid you recommend?
- Wat are the odds I have a TCM failure?
Thank you in advance. Rick (757) 214-5334 or [email protected]
