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It seems to be a nebulous "catch all", there are about a dozen fault readings that can cause the Stabilitrak to shut off. And when I say a dozen, that is probably an understatement, everything from an O2 sensor to issues with brake light switch. Classic Detroit BS, so you have to go back to the dealer and drop $500 each time for them to say it is something different - it is planned this way because they know the average consumer is a sucker. I went to a Tahoe forum, where actual reps from GM occasionally answered. It went something like this...
OP: The light is on, but no symptoms. GM: It can be caused by several faults, we are aware of it and have issued TSB, take it to a certified GM dealer for diagnostic. OP: They replaced and O2 sensor and charged me $500, but a week later the light is back. GM: It can be caused by several other faults, take it to a certified GM dealer for diagnostic. OP: They found a cracked spark plug, demanded to replace all 8, and charges me $$$...but it's back GM: It can be caused by other faults in the electrical system, take it to a certified GM dealer for diagnostic. OP: Turns out the switch that activate the brake light was flakey too, charged me $$$. Finally fixed. Now I have invested nearly $2k to get this fixed, can I get some reimbursement? GM: Sorry, not covered. A standard TSB was issued, not an actual recall.
Like a CEO of a Japanese auto maker once said: "The USA will never build quality cars. You lose two workdays per week. It's workers spend all Friday dreaming about getting drunk during the weekend, and all Monday recovering from it..."
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