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P20B9 which heater is open and how to check on my 2010 Chevrolet 2500 Duramax?

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P20B9 which heater is open and how to check on my 2010 Chevrolet 2500 Duramax? How to check which heater is bad

Vehicle: 2010 Chevrolet 2500 Duramax

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P20B9 CHEVROLET - Reductant Heater 'A' Control Circuit/Open

Read more: https://www.autocodes.com/p20b9_chevrolet.html

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