What is the p21dd code on my Chevy Duramax?

I have reset it. The check engine light comes on when I accelerate aggressively. It show two codes P21DD and P21DD with small PD above the last D. I am able to reset the code each time. Mechanic’s Assistant:What is the model of your ’15 Chevy?

What does p21dd mean on a check engine light?

Upon cold start the check engine light came on with code P21DD. After a little reading I learned that this can result in “Limp Mode”. I was in the middle of nowhere in Northern Wyoming. Not cool! I drove down to Denver and replaced it that week. I shot this video of the repair….. It would only result in LIMP mode if the main tank heater failed.

What is the parts code for a Silverado 3500?

From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. Check engine light came on and local parts store says it read code p21dd. It a 16 Silverado 3500 with a duramax.

What’s the exact code on my 2015 Duramax?

My 2015 Duramax is throwing P21DD code and P21DDpd code. Mechanic’s Assistant:Just to clarify, what’s the exact code? And have you tried to reset it? I have reset it. The check engine light comes on when I accelerate aggressively. It show two codes P21DD and P21DD with small PD above the last D.

What is the p21dd code on my GMC?

2013 gmc, 16,370 miles, cel on with P21dd code and is currently at dealership for def heater element replacement. Vehicle has been there since April 1st and waiting for part to show up the week of the 14th from gm. So my vehicle will be there over two weeks and not very happy. Is it under warrenty yet?

What is the p21dd code on a 2013 Sierra 2500HD?

I had that code come up under warranty also, long story short the dealer had it 3 seperate times and it ended up being a leaking urea injector…wtf I have a 2013 Sierra 2500HD. I just bought it with 125,000 miles on it, and it threw the P21DD code as well. It was about 28F this morning.

Why is my Duramax throwing a p21dd code?

Auto Mechanic: Wolfgang, Master Auto Tech replied 3 years ago This is a heater fault with eaither the tank unit , the heated line , or the heater in the pump assy. nothing to do with the nozzle at all!! The dealer scan tool is needed to isolate on one or more parts by measuring the amperage of each item that is on the heter circuit.

Why does my check engine light say p21dd?

I have a 2013 Duramax that of course has the stupid DEF, my check engine light came on Monday and Orielly’s said the code it was giving was P21DD but there was no explanation…does anyone know what this means? Thank you! Do you know how to go about fixing it?

What is the p21dd code on a GMC cel?

Found this. 2013 gmc, 16,370 miles, cel on with P21dd code and is currently at dealership for def heater element replacement. Vehicle has been there since April 1st and waiting for part to show up the week of the 14th from gm.

What is the p21dd code on a 2013 Sierra?

I have a 2013 Sierra 2500HD. I just bought it with 125,000 miles on it, and it threw the P21DD code as well. It was about 28F this morning. Went to Autozone to get the code read, because turning around to return home wasn’t as convenient.

Why is my 2013 LML throwing a p21dd code?

My 2013 is at 53,000 miles,3,000 past emissions warranty. We’ve started getting colder mornings and its started throwing a P21DD code. Based on a search. It appears to be a DEF tank heater issue, but I can’t find much info about it. Is the tank heater hard to replace? Where can I find the part number? Any help is appreciated.

What is the p21dd code on my Chevy Duramax?