Have a P5K 938m loader with a c7.1 about 2 months ago I had an active code 3110-6. Unplugged the def line heater jumped the pins on the harness it changed to 3110-5 which is what I was looking for to confirm the harness was good plugged line back in and returned to 3110-6. Ordered a new line from cat replaced it worked for about 3 weeks code returned I ran the def heater line test code cleared until now. Ran another def heater test and code cleared. Where should I start looking harness. Or a new bad line heater
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