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Po2b9 def heater not working

Jay guzzwell

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Checked wiring and relay and fuse for open circuit on def heater. Replaced heater pump assembly and engine light still on any ideas?
 
May take a few drive cycles to reset the CEL.
 
May take a few drive cycles to reset the CEL.
It's been over a week now. There is a recall campaign to replace the def fluid module but they are back ordered was wondering maybe that could be causing the open circuit.
 
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