Little update, alarm service message now gone off car still has a dead battery when returning to it overnight, figured I’d give the battery a full charge and maybe try a current draw whilst at work, checked for any codes on the off chance and 2 stored, p0380 glow plug heater circuit A and u0301 software incompatible with ECM/PCM
Erased and restarted car, U0301 returns.
Not happy the alternator voltage drops from 14.5 volts to 13.2 (12.8) when electrics are being used.
Looking more and more likely it may need a dealer visit.
Unless someone has seen this u0301 before.
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