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2012 F550, have an active fault for heater circuit A fault. Removed the DEF tank, checked the heater in the tank, its reading 195 ohms. Tested heater relay prior to removing the DEF tank. Relay tested good. Any suggestions,
I can't locate a system schematic.
 

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Had the same fault. Had the truck in for the 14E03 recall and my work ticket says the PCM reprogram cleared the code. It has not returned.
Sensitivity issue and a new PCM load fixed it?

Does the 550 fall under the emissions recall?
 
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