2005 Cobalt Help. Codes

Co worker having issues with her cobalt. Apparently started bucking on the way home last night and now took it to a shop who apparently has no idea what to do with it.

P0742
P0700
U2100
B1380

No other recent / relevant problems.

Still under the powertrain warranty though…

Go:

the first two are convertor/tranny codes. last is a bcm problem.I think it might has pcm problem. need to see what it is doing on the scanner

well its apparently at Billy Bob’s shop… :tif:

any idea if bcm / pcm is covered under powertrain?

ugh. how many miles are on it.I am leaning more towards a tranny problem the more i read. My 05 started slipping right before trade in.I can’t remember what code showed.

im reading that unpluging the TCC is a quick diagnosis… either the solenoid or a leak in the trans