Service Emission System 3.0 Duramax

[GmcJing]

Service Emissions System warning came on this morning at the start of a long trip. Figured it was a regen thing as the car had been only grocery getting for a bit. However, 2+ hours of driving later and it's not going away.
Limping it to a dealer in Dallas now at 65mph, (soon to be 55mph) hoping they can clear this issue.
11,600 miles on the car so far, seems early for an issue like this.

 

[GmcJing]

At the dealer now, the code came up as high voltage on the DEF tank temp sensor.
The whole time we were driving, regen wasnt happening due to the code so they are attempting to bypass the code and allow it to regen again and see if that clears it up so we can finish our trip.

 

[Capsaicin]

Was the DEF tank filled?

 

[GmcJing]

Was the DEF tank filled?

Yes, just had it serviced two days before and DEF was topped up.

 

[GmcJing]

Dealer was able to fix the issue with a "software update". They didnt get any more specific about it other than that but the tech seemed to have seen this issue before on low mile 3.0's. Another 2 hours down and nothing popped up, so I'm relieved we arent stuck waiting on a part or worse.

 

[booyaltz]

I have a 2022 Diesel Tahoe RST with about 3000 miles and I just got this error. Hoping it's a quick fix.

 

[GmcJing]

I have a 2022 Diesel Tahoe RST with about 3000 miles and I just got this error. Hoping it's a quick fix.

Good luck, I hope yours is as simple as mine was. We drove another 4 hours today and all is good.

 

[Stbentoak]

It wouldn't be surprising that some vehicles may need an update on DEF dosing or algorithms. One of my other vehicles needed the same thing and never had a problem since...

 

[booyaltz]

Mine turned out to be a simple disconnected air hose somewhere near the MAF. Not sure how on earth it would just disconnect.

 

[CTown Duramax]

High output, low fuel consumption, turbo driveability, clean running, all these demands must make for a complicated system. There is some trade off, but these engines are better than ever. The old stuff had problems too.

 

[doc5339]

High output, low fuel consumption, turbo driveability, clean running, all these demands must make for a complicated system. There is some trade off, but these engines are better than ever. The old stuff had problems too.

Yup, great powertrain with more points of failure. Not unlike the Volvo, JLR I4, I6 direct injected, electronically supercharged for low-end, turbo charged, mild hybrids (MHEV); they can be tuned for almost perfect torque and horsepower delivery and excellent efficiency but there's a helluva lot going on.

I love this technology, but I definitely prefer having a port injected V8.

 

[brkoom]

I had the same issue on my 2021 GMC Yukon Denali Diesel. First issue started around 4k miles. The dealership completed the following to resolve the issue:

• Serial Data Gateway Module Reprogramming with SPS
• Radio Reprogramming with SPS (Includes USB)
• EMISSION REDUCTION FLUID TANK RESERVOIR WIRE HARNESS REPLACEMENT

At 6k miles, the issue came back and the dealer replaced:

• REDUCTANT CONTROL MODULE

At 18k miles the issue is back. I have an appointment at the dealer tomorrow to fix that and a leaky sunroof. Anyone else have this issue after everything was replaced? I just assumed it was resolved as it went 12k miles without issue.

 

[GmcJing]

I had the same issue on my 2021 GMC Yukon Denali Diesel. First issue started around 4k miles. The dealership completed the following to resolve the issue:

• Serial Data Gateway Module Reprogramming with SPS
• Radio Reprogramming with SPS (Includes USB)
• EMISSION REDUCTION FLUID TANK RESERVOIR WIRE HARNESS REPLACEMENT

At 6k miles, the issue came back and the dealer replaced:

• REDUCTANT CONTROL MODULE

At 18k miles the issue is back. I have an appointment at the dealer tomorrow to fix that and a leaky sunroof. Anyone else have this issue after everything was replaced? I just assumed it was resolved as it went 12k miles without issue.

Sorry to hear this. I have not had another issue on mine since the reprogramming at 11k and I'm at 19k now. I hope your dealer gets it fixed for you tomorrow.

 

[Stbentoak]

Yup, great powertrain with more points of failure. Not unlike the Volvo, JLR I4, I6 direct injected, electronically supercharged for low-end, turbo charged, mild hybrids (MHEV); they can be tuned for almost perfect torque and horsepower delivery and excellent efficiency but there's a helluva lot going on.

My wife has a 2021 R Dynamic I6 Jaguar that is both Turbo charged and supercharged. If you even breathe on that throttle this thing jumps like a scalded cat. (no pun intended..) I've never drove a smoother, more responsive engine.. Bonus is it will return 30 MPG on the hwy and pulls like a rocket to well past 100... But if you look under that hood.. it looks very complex and uses 15.00 a qt oil and hold 10 qts for an I6. Glad it has a best in class warranty....

 

[RK58]

I picked up my new HC Tahoe 3.0 last Friday I didn't get 20 miles on it until the engine light lit up and I got Emissions system issue thru My Chevrolet app. Right back to the dealer and an hour and a half later they said DPF sensor fault, they cleared it but came back in after 15 miles driving home, a new one is on order. I hope this isn't a sign of things to come as this is my first diesel after 40 + years of V8 Chevys.

 

[steiny93]

I picked up my new HC Tahoe 3.0 last Friday I didn't get 20 miles on it until the engine light lit up and I got Emissions system issue thru My Chevrolet app. Right back to the dealer and an hour and a half later they said DPF sensor fault, they cleared it but came back in after 15 miles driving home, a new one is on order. I hope this isn't a sign of things to come as this is my first diesel after 40 + years of V8 Chevys.

As a baby dmax and an ecoDiesel owner I'm pretty confident stating that modern diesels and reliable don't really mesh well.
But, they do provide killer mileage.