I know this is an old post; I may be trying to resurrect it and find an answer.

We were both coming back in our RAM trucks, a buddy of mine, and developed a buck or hiccup.

All was fine otherwise.

I scanned his truck; he had the code P1693 in his TCM and ECM, but no other codes would clear nor did, and he came right back.

I see it as a companion code, but it was the only code present.

I used an Autel MX808, which is a pretty powerful scan tool.