Brand New 24 Sierra with 3.0L

Memphismatt · July 8

Made it 6 days before I got the Reduced Acceleration message code P2463. Took back to dealer they did a service regeneration, said soot level was 120%? How can a truck that's been driven 6 days with 190 miles have 120% soot level in the particulate filter? I didn't get a keep driving message what happened to self regeneration? Is there a sensor or ECM problem that missed the regeneration? Very concerning being so new.

newdude · July 8

How have you driven the truck in that 6 days? Little idling? Lots of idling? Stop and go? Highway?

Memphismatt · July 8

No normal in city with probably 40 miles of interstate/highway. I've kept the rpms fairly low and varied the mph per the manual on break in. Now most trips have been stop and go short trips but dang 120% soot at 190 miles and brand new. Hard to wrap my head around that.

newdude · July 9

1 hour ago, Matt Willey said:

No normal in city with probably 40 miles of interstate/highway. I've kept the rpms fairly low and varied the mph per the manual on break in. Now most trips have been stop and go short trips but dang 120% soot at 190 miles and brand new. Hard to wrap my head around that.

Its possible. Its not 100% the reason, but the probability is pretty strong. These modern diesels need heat in them. Short trips long term kill DPFs. Need a good highway 55-70mph drive for 20-40 minutes.

MTY55 · July 11

Thank you EPA .

Memphismatt · July 12

Yes just wondering why I never got the keep driving message first, maybe just a new glitch, she's running great.

Polo08816 · July 13

Did the dealer diagnose the issue? What was the root cause?

Jay P · July 13

How many miles were on the truck when you got it? Lots of short trip test drives could cause the DPF to need a regen with low miles.

Memphismatt · July 23

My truck was straight off the trailer, it had 3 miles on it. The filter was indeed full, and they had to force the service regen. I haven't had the problem since but have been on the highway a lot the last two weeks. Overall, that's the only issue and I love this truck and the 25-28 mpg... That's a solid 7 mpg improvement over the 2020 5.3L