With the proliferation of computers in cars these days, there needs to some sort of QA procedure that needs to be undertaken to avoid clashes. Also, there needs to be more disclosure on the systems, what they do, and how they interact.
In another post I reported an issue with my Caddy Maxi Life TDI250, where if I restarted the car within a minute of shutting down, I would get a fault indicating a faulty glow plug. I had this looked at by the dealer and all that was recorded was "Communication error", even though the glow plug light would keep flashing unless the ignition was turned off for at least a minute. The report from the dealer was they "re-programmed" the computer.
Now this could be anything from applying a major software update where the issue was correctly addressed, to changing a setting to completely disable reporting of any glow plug fault.
We have multiple computers on cars, but we rarely know how they interact with each other under all circumstances. It almost comes down to a case of "what is the chance...". We look on car computers as nice toys, yet they how are responsible for our lives as all our actions are is nothing more than a request for one of more of the car's computers to do something. Whether it happens or not is not in our hands.
The problem is that the regulators have no idea as to what is going on, and manufacturers who do not want to disclose anything. Maybe what we need is an aftermarket "black box" type device that takes inputs from various sensors and switches and stores it for later analysis.
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