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Q: decreased engine power light on 2001 GMC Sierra 2500 HD

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i got my truck washed today and they locked the keys in it after using a slim jim we got into the truck with no problem but now the service ngine soon light and the decreased engine power light is on does anyone know how to reset the computer or how to get the truck to run right?
thanks
(1) Answer
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Best to first retrieve codes and note "what the computer sees is wrong". Disconnecting the battery is a very poor alternative to checking codes stored with a scan tool and then using a scan tool to reset the computer memory.