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On my 2013 GMC Sierra 2500HD 6.6L I'm getting a P21DD error code, ever heard of this??

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On my 2013 GMC Sierra 2500HD 6.6L, I'm getting a P21DD error code, ever heard of this??

Vehicle: 2013 GMC Sierra 2500HD 6.6L

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P21DD Reductant heater 1 current too low

The GPCM (glow plug control module) is what detects the heater open circuit in the heater which monitor voltage to the 3 diesel exhaust fluid heaters (DEF),
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P21DD GMC Code - Reductant Heater 1 Current Too Low

Read more: https://www.autocodes.com/p21dd_gmc.html

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