Gmc Duramax Code P21dd
So my vehicle will be there over two weeks and not very happy.
Gmc duramax code p21dd. My 2016 sierra 2500hd has 176 000 miles on it already and recently started eating parts. Scan showed trouble code p21dd. Check engine light came on and local parts store says it read code p21dd. The latest part to fail was the reductant tank heater def heater.
After checking the net and finding you guys and reading your stories i decided i must have def problems. My 2015 duramax is throwing p21dd code and p21ddpd code. 2007 5 gmc black sierra slt 3500hd srw c c. Hey guys my check engine light came on about a week ago.
Runs good still but was thinking it may be something simple before it goes to dealer. It a 16 silverado 3500 with a duramax. 2015 silverado 2500 crew cab single rear wheel lml. Did some research and looks like it was a somewhat common issue on some lml d max trucks.
I talked with a chevrolet service writer and discussed what i had discovered from you guys. I have reset it. Duramax repair reductant system issues. Duramax code p21dd def tank issue.
Upon cold start the check engine light came on with code p21dd. 4x4 lmm z71 diy stock airbox mod afe proguard 7 oem drop in efilive ecm atp heavy tow tune with turbo brake efilive tcm duramax tuner dhd cold side high flow intake pipe dhd pcv re route airdog 4g100 castrol hypuron vecton 15w40 synthetic blend oil donaldson p550832 2 qt oil filter. After a little reading i learned that this can result in limp mode. New down pipe and 5 inch exhaust new up pipe cold air intake new garret stage 1 turbo airdog 165 lift pump egr delete and efi live.
Vehicle has been there since april 1st and waiting for part to show up the week of the 14th from gm. Oreilly checked it and came up with a p21dd code. Diesel reductant tank heater circuit 1 signal low was the translation.
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