Replace your inoperative block heater with this OE replacement from DHD. These L5P blocker heaters have proven to be a little temperamental and are known for shorting out. This block heater is specific to the L5P platform and threads into the water jacket. It cannot be used on 2001-2016 Duramax's.
Fitment:
2017-2019 Early L5P - 2 Pin Heater Cord
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