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Discussion Starter #1
Whenever I take my 2017 Volt (other cars, too) for any kind of re-programming or updating, practically all of my settings and presets are changed. Dash screens are set with different selections, center screen is blank, in the case of other cars, the power seats are in completely different settings and presets are no longer set, etc. etc. I have to pull over, reset everything, then drive away. Are the technicians just messing with me or does the reprogramming actually change everything?
 

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You've got power seats?!!
 

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Well, I'll find out today if that happens. I have 4 updates for my 2017 Premier. Hopefully not. I don't understand why they would
need to disconnect the 12 volt battery for the updates, but we will see.
 

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I've had my 2017 in for several "recalls." Sometimes things like the power cord disconnect alarm get reset, but usually all the preferences are left alone. One time they replaced something in the infotainment center as a warranty repair and explicitly told me ahead of time that I'd have to reconnect my bluetooth phone. If you waited for four updates, I'd guess at least one of them will reset your preferences.
 

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Discussion Starter #5
Well, I'll find out today if that happens. I have 4 updates for my 2017 Premier. Hopefully not. I don't understand why they would
need to disconnect the 12 volt battery for the updates, but we will see.
I had mine in for that Recessed Battery Connection recall. When I got it back,

The Instrument panel was changed from Classic Enhanced to Classic
The center readout showed coolant temp instead of my selection of tire pressure
The smaller panel in the center of the dash was completely blank. Nothing. Turning on the radio revived it but my presets were changed.
When everything started working again, when my tire pressure showed up, the two left tires showed dashes on the display and the right two showed the correct pressure.

Everything slowly returned to normal after a few minutes.
 

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Occasionally reprogramming can wipe out preset preferences and return to their default setting. I suppose depending on what modules are programmed would affect different aspects of the car. Generally speaking, I imagine any presets or preferences that are affected by a loss of 12V power would almost certainly be reset to default. In older cars, this usually included having to reset the time and radio presets, among other items that required a constant 12V to retain memory. I wouldn't necessarily be bothered by having to reprogram certain preferences that may have reverted back to their default setting as that clearly indicates work has most likely been done. I compare module reprogramming as being similar to having to do a factory wipe on a phone, or reinstalling a computers OS. Even with a backup file, some settings just need to be manually configured.

The loss from the TPMS seems to be one of those things in which the receiver just needed a few tire rotations to reacquire the signals from either of the tires. Likely because the two right side TPMS transponders went into sleep mode and stopped transmitting data to save on battery.
 

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how does your DIC reset to radio default when its always set on engine temp
nothing else changes
wonder if gm has more control on the car than they are letting on
12v batt 1.5 yrs old
no where near a dealership
 

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It could be that the tech has to access certain screens to check that an update has applied properly. They are not going to remember what your settings were in this case and will just leave it like it is when they are done.
 
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