chiri

I know this is old but having the same problem, did you get any info on this issue?

thanks for your answers, will wait for the scan/road test and then decide which way to go. Just in case, any recommendation as a source of remanufactured transmissions?

Thanks for your answers, already did a scan but with a very basic scanner, will look for a more capable scanner. I am no expert and have no experience with AT, but the continuos RPM fluctuations seems more as a electronic issue more than mechanic failure, or can it be that the computer activates the TQ lock, detects something wrong and disconnect and then starts cycling? Sorry if this is a silly question, just want to try to understand more of this

My 2011 Silverado has 290.000 very easy miles, mostly highway, and after a period of inactivity it developed two symptoms. First I noted that it goes to neutral when stopping, this is random, not every time I stop and usually when coasting from constant speed, if I am not careful and accelerate, it bangs into gear, have to be gentle. The other thing ir a fluctuation of around 200 RPM at constant speed, for me it feels as the TC locking and unlocking. The oil level is ok, the fluid ir ok. Changed a failing brake switch but no change. Any comments will be of help, not a chance of the dealer solving this where I live.