New to me 2015 LTZ

dna9656 · March 9

It's huge, it's painted black, leather inside, quiet and smooth (like old men like their trucks and other things) and 4 doors. It has some issues like all used vehicles have.

I got the Displacement code, P3200(?) This engine has variable displacement? I got both cat codes, 420 and 430, I have a hood open code, the temp gauge used to work it doesn't now; I got a code for that too. I got a code for the lic. plate light and a code for the front camera. How do I make the front camera work and what's it for anyway? Is it like a dash cam? I think I have other codes, minor ones, the tranny has no codes. I will have to go back out to the truck and run all the tests with a clipboard and pen in hand. When I got it home there was no CEL, the next day the CEL came on of course. The selling dealer says he'll fix the codes, well I'm leery of that, I want no spark plug extenders used on the O2 sensors, that's no FIX.

After running around all day with my so the CEL comes on. WE get home and we look up the P0420 and P0430 codes. First things first, we check the oil and find it WAY over serviced; like the oil is 3 inches above full mark! Dr. Google says that might set off the Displacement code as well as the Catalytic Converter (CAT) codes. Drain that oil out and put in 8 qts. of 0W20 for high mileage engines. Filled the filter with oil too, before spinning it on tight. This morning the oil level is dead ?uts on full. Reset the oil sensor; yeah I know a lot of guys think it's bogus but until you know YOUR truck you follow the manual. Well, the Displacement code has not reset so far. Mr. Trainer (on Youtube) says the cats could be poisoned by the over serviced oil condition. He says it may be remedied by using a fuel additive designed to remove the deposits the oil leaves in the cats, I got some and Wal Mart, (a good place for some stuff, like oils and additives, way less $ than buying "mechanic in a can" at the auto parts stores. Seafoam is totally a miracle for fuel issues on carbs or injection units, and WM is the place I usually get it. This truck has the 6 speed automatic, I assume that's the automatic everyone gets. The tranny controller has no codes, It feels like it "hunts" for the right gear at lower speeds (when on the freeway and the freeway is a moving parking lot) it is disconcerting. I can feel it downshift too, the down shift isn't like a TH 350 with a shift kit in it; it's much gentler. I plan on changing the Xfer case fluid and tranny fluid and filter this week The temp gauge, the gauge checks out fine was working just fine till this AM; I drove about a 1/2 mile down to the cross road (I live in a rural area) and I could feel warmth coming out of the vents! That's a FAST warm up! I drove about 5 miles and I turn around, shut it off, turn it ON and pull and clear codes, Start it up and the temp gauge sets on zero, all the way to WMART and back home it doesn't budge, the fans continue to run after engine shut down, the Truck sets for a a good while (the fans stopped at some point) I start it up and the fans come on right away!, I drove over to my shop (a detached garage about 140 feet away) and shut it off to unload some stuff and the fans continue to run, they stopped I believe, I was there about 15 minutes, less. They continued to run after driving the same distance back over to the drive in front of the house. Is this normal? I think the temp sending unit or it's circuit is the trouble.

Is there anything I should know about that before I start the tranny and Xfer case fluid changes? Do we still use the Dextron 6 from AC Delco or is there a 7 or 8 now?.

Does anyone know where I can buy a owner's manual in book form? Downloading one would be ok, it's just big. If you have a site for that I'll take it!

So, anything you good folks can share with me would be much appreciated!

Edited March 9 by dna9656
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