Codes Clearing Themselves ???

Still got a little gremlin after installing the Hewitt Gen 2 Bypass Kit.
I'm still getting Check Engine Light and P1613 Code which I've cleared 2 or 3 times 'post install'.
The last time I cleared it the code came back 4-5 days later.
But here's the weird part, . . . 3 days ago the I hopped in the truck, fired it up and no more code !
I didn't disconnect the battery or do anything else that would clear the code, it went away on it's own.
I was not aware that this could happen on these trucks (2006 2WD DC)

I spoke with Hewitt and they've been great about helping me trouble shoot.
I've been too busy to get under the dash to check my ECM connections, but I will and report back.

One thing they asked was how much slack I left in the wires when i did the connection(s). They said the system is VERY sensitive down the the mili-volt and excess wire can cause issues.

Anyways, I'll keep updates coming as things happen, . . . the code clearing itself was new to me.