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Q: repair on 2003 Chevrolet Express 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
check eng. and security light came on ,when you turn switch off lights stayed on, now when you turn switch off the engine keep running ,security light on, and transmission isnt shifting right, how do you fit this ?
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A scan tool will be needed to retrieve codes in the memory of your Chevy's computer, computers in your car may not be communicating properly with each other but a scan tool that can communicate with all the computers of your Chevy will be required to do basic diagnostic tests.
Thanks, I do not have a scan tool. Does this mean I have to bring the van to a repair facility for diagnotistic?
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