Has anybody else noticed how shop guys treat ECM flashes like they're just installing a phone update? I had a buddy who worked at a dealership and he told me stories about guys rushing through flashes with the engine still running (yikes). The whole voltage thing is real because I've seen alternators put out 16 volts when they're dying and that's basically throwing a grenade at the computer. One time my own truck got a wonky flash from a quick lube place and the transmission started shifting like it was drunk for a week until I got it fixed. Makes you wonder how many trucks get wrecked by shops that just want to move the line faster.

My sister does the same thing now I'm copying her too.

Actually @amy_murphy15, I used to worry about that too until I saw test results that changed my mind.