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So my fiancée’s mom has a 2011 impala Lt. A couple days ago her speedometer started acting up, bouncing between 0 and 20mph and it wouldn’t shift out of second, but there wasn’t a check engine light on and no codes when I scanned the ECU and TCM. I go to replace the VSS, and the old one had a huge gash in the center of the plastic and a bunch of huge metal shavings stuck to, but I went ahead and replaced it. Test drove it, still acting up, but this time got a p0700 code from the ECU and p0722 from the TCM. Took the old sensor out and again, a huge gash on it. Anyone know why this would be happening?
 
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