Diesel Place : Chevrolet and GMC Diesel Truck Forums - View Single Post - LML: Need regen help; Lowell, Ind.
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Old 12-23-2018, 11:39 AM   #8 (permalink)
Self Ignition
Join Date: Feb 2011
Posts: 95

Just had def heater repl'd under warranty, error code dtcp21dd, open circuit, gm has kit that includes sensor, kit contains reductant heater and level sensor assy, this is a no charge fix, seems these fail across Chevy and gmc platforms
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