.. it's the ECU itself. Internal data corruption (I can read the code from the ECU with laptop and dealer-level software).
The general feeling is that these failures are due to voltage spikes (more prevalent in motorhomes due to the add-on electrical systems), and it is very common.
The reality is that the ECUs used were probably under-specced and over-prone to failure. Fiat, under mild pressure, will generally replace the unit out of warranty, but at the age of my van it would (regardless of my own code-read) require me to pay a Fiat "Professional" dealer for official diagnosis to start the process (c£100), and Fiat providing the part free for the dealer to fit and code at my cost (£100+).
Given that I wouldn't trust any of the 4 nearest dealers to work on the vehicle, that I can probably get the part successfully reflashed at £60 (or source a brand new, and probably updated replacement at £250), and that I have the ability to do all the work myself, that's what I'm doing. The ECU is readily accessible next to the vehicle battery under the cab floor so it's fiddly rather than difficult.
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