Jeff,
There aren't any special changes that were made to your tunes when they shipped. You may need to have the PCM scanned for codes as there isn't anything that I can think of that would cause the CEL to come on immediately on start-up short of insufficiently cleaned PCM contacts or a hard failure of a sensor or something (wierd that it would have happened overnight though).
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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