GMC Troubleshooting Questions? Ask a Mechanic for Answers
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That could very well be in the control module, if the running boards have been initialized. Not that it's very common with them though.
I can get the test instructions for it and put it in a PDF file, (it is rather large) and send it to your email address for as little as is allowed by the site.
You will just have to accept the additional service offer and ENTER your email address in the private section so that I can see it. I do not have access to your email address, Thanks
Do you still need help with it?