Sounds like it's dosing fuel through the 9th injector and the flange is leaking. Fairly common. I believe there is a TSB on it.
HELP white steam 2011 Sierra 3500
Hello I have a 2011 GMC Sierra 3500 Denali 6.6 TD. After about 5 minutes of driving it white steam comes up through the hood and when I get under it to check where it’s coming from it seems like it’s coming from the turbo downpipe to exhaust system when the two connect via the v clamp. The whole bottom from the v clamp down the exhaust pipe is soaked in what’s leaking Has an oily base to it pretty sure it’s diesel. I’ve replaced clamp I’ve done some research and others have posted these two links in regards to it.
- Streamable Video MY VIDEO
- Streamable Video MY VIDEO
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That was one of the tsbs I found on it , I saw they made new downpipes with flanges which would make sense for it not properly sealing metal to metal but when I replaced the 9th injector I drove it 200 miles and just when I got back into town it started steaming again.Sounds like it's dosing fuel through the 9th injector and the flange is leaking. Fairly common. I believe there is a TSB on it.
It's only gonna produce that smoke (it's not steam) when it is in regen. When not in regen the 9th fuel injector is just along for the ride. (No fuel added in the exhaust, no fuel leak, no smoke)That was one of the tsbs I found on it , I saw they made new downpipes with flanges which would make sense for it not properly sealing metal to metal but when I replaced the 9th injector I drove it 200 miles and just when I got back into town it started steaming again.
The def injector is working whenever the truck is running.
First TSB was to realign/tighten the joint.
Later tsb was to swap to the new style if a truck had the problem (they didn't all do it)
I forget when it was was for production LML's.
It's only gonna produce that smoke (it's not steam) when it is in regen. When not in regen the 9th fuel injector is just along for the ride. (No fuel added in the exhaust, no fuel leak, no smoke)
The def injector is working whenever the truck is running.
First TSB was to realign/tighten the joint.
Later tsb was to swap to the new style if a truck had the problem (they didn't all do it)
I forget when it was was for production LML's.
It’s leaking from where the down pipe and exhaust meet at the clamp and leaking onto hot exhaust causing white steam to riseIt's only gonna produce that smoke (it's not steam) when it is in regen. When not in regen the 9th fuel injector is just along for the ride. (No fuel added in the exhaust, no fuel leak, no smoke)
The def injector is working whenever the truck is running.
First TSB was to realign/tighten the joint.
Later tsb was to swap to the new style if a truck had the problem (they didn't all do it)
I forget when it was was for production LML's.
Sure it's definitely fuel? Because if the heater core lines leak, it can drip near that area as well.
If so, yours has a different problem than the trucks in the hundreds of posts about that joint from back in the 2011 - 2014 era.It’s leaking from where the down pipe and exhaust meet at the clamp and leaking onto hot exhaust causing white steam to rise
I'm sure searching at Diesel Place and/or Chevy and GMC Duramax Diesel Forum would find lots of threads about it.
(I wasn't on this site in that era -- but was a frequent visitor on those ones)
Streamable Video here’s an updated video after turning it off when the steaming started.
On the tsb if realigning didn’t stop steaming I guess they recommended doing a new down pipe with updated flange
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