P1378 code ?? - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 07-05-2012, 04:42 PM Thread Starter
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P1378 code ??

Just noticed today according to my gryphon ficm tuner I'm getting the p1378 code which means low voltage to ficm. I checked my ficm output and am getting no less than 48 volts even when cranking. My ficm input was reading 11-12.5 volts. Does the input seem normal ? The truck runs starts idles great. I'm getting great fuel mileage aswell no blue or white smoke. Just curious as to what's causing that code to keep popping up after I clear it.

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