06 lbz about a week ago started to develop pressure in the over flow after sitting during the day/night hose isn’t rock hard but can tell there’s pressure and coolant will spill out when cap is removed obviously this morning got to work it’s pissing out the over flow white foam everywhere layer in the tank aswell but other then that truck still runs great and has plenty of power was tolled I wouldn’t have any power if the gasket was gone truck has green coolant so was thinking maybe it’s got a clog somewhere and just needs a flush like I said in the morning the hose isn’t rock hard just feels like there a small amount of pressure it’s most likely HG related just thought I’d ask 🤷‍♂️ thanks

I am getting ready to put it to bed until spring. which would be better,remove the negative on both batteries or put a battery tender on both batteries. Tia

I have an 09 LMM. I pulled my cooling stack apart to clean it, and while I was in there I put a new fan clutch and mishimoto low temp thermostats. Now that I’m done I’ve been reading online that the jiggle pins or whatever they’re called, the little holes for air to get through needed to be facing the cab/rear of truck. I didn’t orientate those in any specific way, I just made sure it fit in the housing correctly.

Is this going to be a problem? I added coolant already but haven’t ran the truck and got all the air out yet, was going to do that tomorrow. It could be placed correctly but who knows, it would have been on accident. Do I really need to open it up again to possibly spin the rear thermostat a little?

I just got a p22fe code for my Sierra. I had a message in the truck screen just before that said "service dog system". It went away but now I have the check engine...

I have a 04 LB7 extended cab 4x4 that I will likely be selling soon to offset the cost of a new purchase. 197k miles, new Bosch injectors about 25k ago, some miscellaneous steering work and steering box probably 10k ago. Body has dents and dings like most trucks of this age and torn seat and saggy headliner. Truck will probably need tie rod ends and ball joints in its near future and pump rub kit. What’s fair price range to ask for this truck? It has its issues but for the most part I have been repairing or replacing when things pop up. I see trucks listed around me running the gamut from way overpriced pavement princesses to beat to hell and back work trucks but not many middle ground.

Anyone know of a really good programmer for 2019 Colorado duramax?

Noticed my engine temp gauge bouncing from ~180 to ~210 to dropping out. Check engine light never came on, but it's clearly an issue because when it drops out it feels as if the engine is over-revving.

Replaced the Coolant Temp Gauge with a new connector and tested that it was throwing 5V before hooking it back up, but still having the same issues.

I'd assume that the next troubleshooting step is to replace the Coolant Thermostats?

Anyone else out there run into this issue and how'd you fix it?

I’m looking for a gauge so I can monitor everything on my truck. Are these good to have or is it just personal preference to have that option? What brand do yall recommend?

Hey so I just bought an lbz with 205xxx miles. Just got a inspection done and besides rebuilding my front end, they saw my carrier bearing is worn out. It doesn’t have play, doesn’t vibrate or nothing will more than likely will soon. They quoted me $800 to rebuild it all including sending it to a drive shaft shop and rebuilding/rebalancing everything. Another shop will just replace the bearing for $300. Since the shaft isn’t moving, do you think it really needs to be rebalancing?

Hey I currently have a 5.3 cateye and I’m looking to getting a diesel and possibly turning it into a welding rig. Boy do I love Chevy so I figured just get the diesel version of my truck. Thing is I know the LBZ is supposed to be better but I found this super clean LLY owned by a shop tech and was wondering if anyone has any input on LLYs whether they’ve owned one or have something else and recommend it, thanks.

Hi folks! I'm looking for input on the best spot to get injectors. No failures, 2011 with 300k (kms) just looking for a good economy swap. Not interested in adding power etc truck doesn't have a difficult life, sits more than it runs really. In ontario canada if location matters. Appreciate it!

Hey guys. 2006 LLY here. I took off a faulty A/C Mode Actuator a couple of months ago. Immediately fixed my problem as the actuator must have seized up between Defrost and Full Face modes. As soon as I removed it, Full Face started blowing like a champ.

I was in no hurry to replace the actuator but getting around to it now and I can’t find the damn screws. My fault, I get it. They were in my magnet tray and now they’re not. I suspect my 4yo has something to do with that.

Would anyone know where to get OEM screws? They were goldish in color, 5.5mm. Link to actuator below. Thanks

https://a.co/d/7KtC4fW

My work has 4-1 gallon jugs of delo isosyn 15w40, but the problem is it was made in July 2015. All are still sealed, I opened the one loose jug and it smells and looks fine. Should I dispose of it or put it in my truck. I’m leaning my towards toss it.

I have a shake from 55mph and up. Any ideas? Tires and wheels are new, stock oem wheels with 285bfgs, ball joints tie rods and wheel bearings seem to be good.

Has anyone here done a projector swap? Preferably I'd like to swap projectors to the Morimoto MLED 2.0 but I'm pretty clueless about this stuff. There are brackets available that will allow the projector to bolt up nicely to my factory housings, however I have no idea where to start with the electrical side. I don't want aftermarket headlights, I just want the factory housings to work a little better.

2015 Sierra 2500 Denali

So I bought a 2015 LTZ with 80k on the clock. After putting another ten on it I think the noise in the cab has gone down. Should I be sweating bullets, or could I have just gotten used to the sounds like my wife is suggesting? There's no loss of power and economy is fine. 15 city and 24 highway unloaded.

2015 Duramax 2500HD Z71 SLT

I don’t know shit about electricity wire wise or how to find the problem with it but has anyone else’s left turn signal didn’t work and what was your problem with it to give me some ideas on what to look into

My truck went on limp mode for a few minutes then it’s went away. So I plugged this bad boy in, when I first started the regen dpf spot numbers were at 2, now they’re at 0. Been on regen for 35 minutes now.

Side note, am I suppose to stop the regen or let the software idle down and say the regen is over….

Is this the stock fuel tank? I really can’t find anything online when I type these numbers in. Truck was on empty with light and only took 19.460 gallons when I filled up.

Just bought 04 lb7 It doesn’t over heat but sometimes after I park it I noticed coolant leaking from reservoir , I’ve changed the radiator cap already. Also the top hose I’ve noticed it’s hard. Any suggestions ??

Just did a pull in my lbz and it did not like it. Tranny slammed extremely hard, cel popped up immediately, scanned it and it said “P0732 incorrect 2nd gear ratio” as well as “P0700 Transmission Control Module Requested MIL Illumination” I’ve read it may just be the tcm but I want to say it’s more than that judging by how hard that thing slammed. Anyone have any advice?