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Chevrolet chevy 3500 K ^.6: no communication with Pcm 2007…

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no communication with Pcm 2007...
no communication with Pcm 2007 Chevy Duramax, powers and grounds good, Powertrain relay powers up, comm with the rest of the modules , only code is U0121
Submitted: 3 years ago.Category: Chevy
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Answered in 27 minutes by:
5/24/2015
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 18,026
Experience: 15 years GM master tech
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.Ask me about added features such as phone contact anytime if you wish !
I am sorry for the long wait
will the truck run ?
with the key ON is the check engine light lit up in the dash ?
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