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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
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Experience:  GM Grand Master Technician 2007. 14 years experience.
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What does code p21dd mean on a 2013 cheve diesal 2500 pickup

Customer Question

what does code p21dd mean on a 2013 cheve diesal 2500 pickup
Submitted: 10 months ago.
Category: Chevy
Expert:  Daniel Jones replied 10 months ago.

Hello. Welcome to the site.
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DTC P21DD

Reductant Heater 1 Current Too Low

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