check engine light

on my daughters 2001 GMC Yukon XL with 5.3 engine she went in for the annual state inspection and just before getting there the check engine light started glowing. of course it failed the inspection and they gave here a temporary one for 2 extra months. well being a single mother shen couldn't afford to do this right away so after 4 months she finally could afford it and had it done. now the question is she was told she had to put 100 miles on it to cancel out the code as just clearing it wouldn't work. if she drives in now with an expired inspection ticket she get fined for driving an uninspected vehicle. now is there a way to get the code canceled out with out driving it for 100 miles and risking a ticket. thanks

Same issue here in Nys, if you clear the code with a scanner, you must go thru a somewhat lengthy drive cycle so all the monitors come back online. What was the code? Most codes, if fixed, can go thru 10 ignition cycles, still need the code for more accurate advice.