So, ever since I’ve owned the truck, I’ll periodically have “Service 4x4 System”, and odd behavior with the Transfer Case. It will randomly start
In Auto, when it was left in 2wd, and usually reset itself after a power off / on.. this morning, I started her up, and when I got in, she’s indicating 4lo... I was
pretty confident it wasn’t in 4lo, and as soon as I moved the vehicle, suspicion was confirmed.
However, driving the kiddo to school, I immediately noticed the transmission was shifting up way too early. I’d be going 15-20 through the neighborhood, and she’s in 4th gear, just crawling, and with a little vibration, I guess just because it was such a high gear for the speed. This definitely alarmed me.
So I manually shifted, and that worked fine. Got her home, got out the Tech2, and eventually was able to pull a C0327 code, which is for the decoder ring, and there’s a TSB for it. Ok, no biggie, I’ve been waiting for this. Got the replacement in, here’s the old one.. only pic I took:
So I’m glad about that. Only, I’m pretty concerned with how the trans was acting this morning... it seemed like once it warmed up, she shifted fine in drive, and I was able to shift 1,2,3 just fine before she warmed up. I’m guessing the tcase saying it was in 4lo caused the trans to shift oddly, since I was going well over any speed you’d be at in 4lo.. any thoughts on this..? I’m crossing my fingers that I don’t need to order that trans yet... but I do want to figure out exactly what I’m getting, and order soon, since it’s just a matter of time.
Oh, and I did install my new, genuine GM interior part today. Rough install...!