This 2013 Silverado had quite the confusing issue where it would crank the engine when you cycled the key from off to ignition on then back to off. There was no codes to be found and Service Information was also a bit misleading. Sometimes you need to think outside the box.
Amazon Store Goodies
https://www.amazon.com/shop/automotivediagnosticsprogramming
Topdon Phoenix Smart
https://www.topdon.us/collections/diagnostic-tools/products/phoenix-smart?ref=SEZpOAa8Cf_j7V
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