2006 buick lucerne 3.8 stuck in second gear. And won't shift. No codes or check engine light

[2007LucerneCXL]

That's for the Northstar V8 with the 4T80E.

 

[BuickGirlFromMars]

That's for the Northstar V8 with the 4T80E.

Oh. Do you know where the TCM is then

 

[ulycyc]

For the car info listed GM doesn't show a "transmission control module" To be sure take a picture of the info plate on the side of the transmission. If it is controlled by the pcm then that could be the problem but that should also show codes.

 

[2007LucerneCXL]

The PCM on 3.8L Lucerne

 

[Jt601]

Yep, I didn't find the tcm. But I found the pcm located in the air box.

 

[2007LucerneCXL]

Here's a link to the free Chilton manual which should help on troubleshooting and questions

McDowell County Public Library - Chilton Auto Repair

mcdowellpubliclibrary.org