Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
You want to have this done by a facility that has a transmission flush machine.I would ask them to perform a "transmission fluid flush" then once the flush is done ask to have the "transmission filter" to be replaced as well as the filter will suck up any debris and you don't want the debris making its way back into the transmission components.
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Most places will do a transmission flush around $70 to $100 then it will cost another $50 to $75 to have the filter replaced in some cases.
If it were mine I would have the solenoid checked/tested first this way if found at fault it can be replaced the same time the filter is replaced to save money.If it tests o.k. then I would have the flush and filter done and if this doesn't correct the fault then the valve body will need tested to see if it needs replaced.
If they are known reputable repair center in your area then they should be able to test and repair this as well as perform the flush but if you know very little about their facility it would be best to have either GM dealer do this or GM repair center.