poppy510

My horn was also cut and truck broken into. The horn is easily accessible to thieves just by reaching through the grill....GMC should program the louvers to close when parked. My horn and wiring are now shrouded with very sharp sheet metal to prevent future attempts.

I bought box of the platinum because the Peak blue was sold out. I promptly received a P2BAA code "SERVICE DEF SYSTEM." The countdown to limp was activated. The code cleared after a few restarts. Interesting that others have reported issues with the Platinum....will be researching more.

This would be good. The auto exhaust brake on tow mode is worthless. As far as I can tell it just redlines the engine even when light braking would be adequate. I often turn tow mode off downhill to avoid the excessive downshifting.

ya the cutouts in the exhaust pipes near the outlet. I think they let cold air to cool down the exhaust when it's going through a regen. Basically so you don't get burned when you walk by the exhaust.

Well I overlooked a leak at the clamp at the braided flex connector because it was leaking so bad it blew the soap right out without making bubbles. I used a shop vac backwards and blowing into the tail pipe to locate. Plugged the second pipe with a rag and taped the exhaust pipe cutouts (cooler vents) closed. Used tiger tape under the clamp and had to snug up the 02 sensor too. No more leak and no endless “cannot replicate” loop with the dealer. here is a link with more discussion about this apparently very common issue. https://www.duramaxforum.com/threads/dealer-cannot-fix-cel.1019251/page-8

Well I may have found the source of the exhaust smell. No leaks that I could detect at any of the pipe joints, but found a significant leak from the turbocharger vane actuator shaft. I then found this Service Bulletin No.: 22-NA-168: However, it clearly states Any thoughts? Seems Like a lot of exhaust coming from the shaft....enough to smell inside the cab.

Can some of you weigh in on this: I notice the smell at cold start when it is COLD out...i.e. near or below freezing. Are you all getting the smell in cold weather conditions only, or every time you start for the first time in the morning no matter what the outside temp is? Thanks...trying to get the dealer to replicate...

I would sue you immediately if you crashed into me.

That’s a good idea. Going to cover the door key hole too to make it less convenient.

The best solution would be to program the truck so that the louvers close when the truck is shut off. Anyone at @GMCustomerService listening?

All you have to do is reach into the front grill and unplug.

My 2022 Sierra 3.0 liter Elevation was broken into in a fairly busy parking lot. The first thing they did was unplug the horn, which is ridiculously easy. Then they punched the driver door lock and were in with no alarm. Just a heads up. Im planning to put some sort of cage around the horn and wire connector just to make it a LITTLE less convenient for a thief to disable the horn/alarm.

The OP, along with several other posters stated that this is happening only when cold and using REMOTE START. This is my issue. I do not seem to have the smell when I am in the truck starting it with the start button. Can others clarify if they are having the issue with Remote AND Manual start, or just using Remote start.

I’ve posted my simple solution too…a number of times. But people continue to be perplexed by the noise and how to fix it.

See my post from April 11th. $40 and 15 minutes and you will have this problem SOLVED!