Why my car wont restart after removing steering lock cylinder?
on 2007 Chevrolet Impala

I remove lock cylinder to check tumblers because key had become jammed

Asked by for the 2007 Chevrolet Impala
Security system has activated. Locksmith may be able to help or tow to Dealer. What did you put back, the same lock cyl & key? IF so the VATS may still allow it to work if reprogramed.