Trouble Codes 6.4L - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 06-22-2011, 06:01 AM Thread Starter
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Trouble Codes 6.4L

I just changed the fuel filters in my '08 F350 6.4L. Turned the truck in the on position, let it sit for about a minute for the fuel pump to re-pressurize the lines(I'm assuming this works?) and tried cranking it up. Truck tried starting but never did (which has NEVER happened, always starts right up), and I noticed on my display that a wrench and what looked to be an oil light appeared. I ran diagnostics (with my SCT Tuner) and trouble codes UO100, UO105 and UO115 appeared. I found out that these codes are:
UO100 is lost communication with ECM/PCM A
UO105 is lost communication with Fuel injector control module
UO115 is lost communication with ECM/PCM B

I tried clearing them but they keep reappearing along with the same lights on my onboard display. Any ideas what happened or how I can fix this?

2008 F-350 King Ranch Dually 4x4, 33" BFG Mud Terrains, SCT Programmer with DPF and CAT Delete Pipe

2004 F-250 Lariat FX4, 35" BFG A/T, 4" Pro-Comp Lift with Dual Stabilizer Kit, In-Dash Nav/DVD, 2x12" Pioneer Subs with 2400 Watt Kenwood Amp, Banks Intake, Bosch Starter, 220k miles
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