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Have a 2013 GMC 2500HD Denali 160k mls. Check engine light…

Have a 2013 GMC...

Have a 2013 GMC 2500HD Denali 160k mls. Check engine light came on. OnStar says exhaust emissions system. Truck is running great and all the check systems are normal. It's out of warranty so worried lol

Mechanic's Assistant: Does the light stay on, or does it blink?

Stays on. When you first turn the key over it will come on then go off and come on again. The when you start it stays on solid.

Mechanic's Assistant: What is the model of your '13 GMC?

2500hd denali

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Well if I can fix it myself I will. The warranty is out and I don't have thousands of dollars to spend at a dealership.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Nothing I can think of. We just filled the DEF up and have only been driving around town.

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Answered in 1 minute by:
3/12/2018
Ron Z.
Ron Z., - Chevy Tech -
Category: Chevy
Satisfied Customers: 19,652
Experience: 18+yrs experience. State Inspector and Chevy Diagnostics
Verified

Hi! Welcome to JustAnswer. Thanks for coming! I'm Ron and I'll be working with you on your question today.

May I have the "p-code" associated with this? If you do not have it, you can call OnStar and they can provide you with the "p-code".

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Customer reply replied 1 month ago
I don't have it. I will have to call.

Ok. Yes, please do. That p-code will help us a ton to better pinpoint the problem.

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Customer reply replied 1 month ago
P21DD

Ok. Does your vehicle have the diesel engine?

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Ahhh. Ok. That's why I couldn't find this p-code! Unfortunately, I am not a diesel Tech. I will opt-out and forward you to a diesel Tech. My apologies for any inconvenience. Sit tight one minute... a diesel Tech will be right with you!

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Customer reply replied 1 month ago
Thanks :(
Ron
Ron, ASE Certified Technician
Category: Chevy
Satisfied Customers: 37,776
Experience: 35 years experience with ASE Certs
Verified

Different Ron here, are you still needing help with this?

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Customer reply replied 1 month ago
Do I have to take to the dealership to fix the code?

The common caused for the code P21DD to set is in 99% of all cases is caused by a failing Reductant Tank Heater which is located Under the vehicle, inside the reductant tank. Is this something you think you can fix if I provide you with the steps?

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Customer reply replied 1 month ago
Possibly yes

Okay, have a look at the replacement steps in the link below.

https://www.dropbox.com/s/reqp9dae93tmbf9/Tank%20heater%20Mar%2012.pdf?dl=0

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Customer reply replied 1 month ago
Thank you!

Your very welcome and thank you as well. Please take a moment to rate my service at the top right hand side of the page so I can get credit for my time, the question remains open for follow up even after doing so, all you need to do is return to this question if need be.

Thank you again.

Ron
Ron, ASE Certified Technician
Category: Chevy
Satisfied Customers: 37,776
Experience: 35 years experience with ASE Certs
Verified
Ron and 87 other Chevy Specialists are ready to help you
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Satisfied Customers: 37,776
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