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2016 GMC Canyon diesel
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Read all the post on diesel shudder problem, I have the same problem. Had trans computer updated, trans oil and filter changed, $500 later, no help. Has anyone received help from GM yet?
 

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There have been reports of torque converter clutch issues with some 6-speeds, unfortunately it sounds like you're at that point since you've tried everything else. The only help from GM here would be replacing it under warranty, but outside of warranty don't expect any help. There's no recall for the issue, you're stuck having the torque converter replaced on your own dime from the shop of your choice.
 

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Was having extreme transmission shudder before my DPF clogged up entirely... Refuse to pay the $3000 that GM wants for the DPF replacement and installation.
As of now, I have bought DPF flush liquid, a bi-directional OBD reader and some band clamps to see if I cannot clean my DPF and regen myself...
Next issue to solve is a new Torque Converter and Transmission bell housing along with a couple of the shift kits offered by Sonnax. This was my post before my DPF clogged up and my truck turned into lawn art...

Once I get my tranny mechanically sorted out, I am going to do a non-delete tune and just keep cleaning my DPF as needed...
I already had my DEF module and pump replaced along with my second CAT... that was "under GMs dollar" but still cost me $1500 for all the other sensors and misc stuff that they claimed were bad and needed replacing.
 

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All I can say is that if you do have to replace your torque converter , consider the revmax unit .Some folks have reported good results with this stouter unit and it is what I would use if I were ever in your situation .

if you do consider tuning your truck , don't forget the trans tune . The stock factory trans tune is half baked , to say the least .
 
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