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There is a way to check your ficm voltage with a volt meter. You can do a search on this forum how to check it using a volt meter. I use a scan tool that plugs into my obdII port.
DTC are diagnostic trouble codes that may or may not turn on your check engine light which can also be checked using a scan tool. I used the auto enginuity tool and/or a torque app for my smart phone.
My ficm voltage at KOEO (key on engine off) was at 38 volts and truck ran rough, bucked and had no power for about 3 minutes...also blew a little white smoke. Your ficm voltage should never be less than47 volts.
I sent my ficm to ficmrepair.com and were very helpful. Sent it to them and had it back all within 5 days