04 f350 6.0L just recently put in a scan gauge 2 and am trying to figure out why im getting 10v on the flp. On very cold startups. So i got the ficm out and glow plug module out. KOEO to test the power at c1388c and there are no codes showing on the scan guage2. Even when i unplug and plug back in. The tool works fine for monitoring just not reading codes. Any one seen this before?