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What does code p21dd mean on a 2013 cheve diesal 2500 pickup…

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what does code p21dd mean...
what does code p21dd mean on a 2013 cheve diesal 2500 pickup
Submitted: 2 years ago.Category: Chevy
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Answered in 1 hour by:
2/10/2016
Chevy Mechanic: Daniel Jones,
 replied 2 years ago
Daniel Jones
Category: Chevy
Satisfied Customers: 507
Experience: GM A Tech at Straub Buick GMC
Verified

Hello. Welcome to the site.
Thanks for coming.
I'm ***** *****.
I'm here to provide as much information and insight as I can, to best answer your question.

DTC P21DD

Reductant Heater 1 Current Too Low

If you need more help, please use the "Reply" tab to continue our conversation - I'm happy to answer follow-up questions.
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