When I received the reader in the mail, I opened it up and looked through the booklet. Seemed pretty easy to me. So I plugged it into my car's socket, turned the key to the "on" position without starting the engine. He gave the code and then identified it as the intake manifold tuning valve. Went to the online GM genuine parts store and ordered a part for my 2008 GMC Acadia. Then I went on YouTube and watched how they change the valves. It doesn't seem difficult. After receiving the part, I removed the old valve and replaced it with a new one. It took about 20 minutes. Car started and drove well. Ignition on without engine running, reader plugged in again, clear code, engine light off. Paid $23.85 for the reader, $153 for the part. Since the part is listed for $279, the dealer would most likely charge me for the part, plus a $99 diagnostic fee and, I suspect, $150 labor. I saved about $350 and have a reader to use at other times if needed. I love saving money! Many Thanks.
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