Checked ecm terminals and everything looks good.
Found this about a lawsuit where excessive e85 use triggered p228c:
https://m.carcomplaints.com/news/202...ismissed.shtml
As an experiment I added 3 gallons of premium from shell after my tank got down below 1/4 and so far my issue is resolved...
I'll report back if it comes back.
Maybe I need to run a tank of premium every so often to prevent this issue. I've ran the car solely on e85 for a few years now.
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2015 LFX M6 LS:Rotofab intake,Vmax ported throttle body,Jacfab laminator FX,extendolator,ARH HFC downpipes,Magnaflow resonated X pipe,SLP LM2 catback,Solo J pipes,Overkill Flexfuel sensor,E85 tune,3.91 gears,Monster twin disc clutch,Michelin PS4S tires,FR ZL1 wheels,SS brembos,BP drilled and slotted rotors,HPS 5.0 pads,RST SS brake lines,BMR rear trailing arms,Hendrix solid rear cradle bushings,1" drop Hotchkis lowering springs,1LE struts and sway bars,oem strut tower bar,Pedders radius rod bushing insert and rear trailing arm bushings,Z28 upper control arm bushings
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