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2006 GMC Envoy AWD 3.4. The ECM failed and needed replacing.

Customer Question
I ordered a new on...
2006 GMC Envoy AWD 3.4. The ECM failed and needed replacing. I ordered a new on from ACDELCO and installed it. It will not communicate, eother with my J2534 programmer or my snapon scanner. No crank. No security light on or flashing. Any special procedure that I missed. I tried disconnecting the battery and shorting out the leads.
Submitted: 6 months ago.Category: GMC
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Answered in 2 minutes by:
12/7/2017
GMC Mechanic: Gary, ASE Certified Technician replied 6 months ago
Gary
Gary, ASE Certified Technician
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.

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GMC Mechanic: Gary, ASE Certified Technician replied 6 months ago

was the new ECM programmed to the trucks VIN number ?

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Customer reply replied 6 months ago
No it came unprogrammed. That was what I was trying to do with my programmer and the ACDelco subscription
GMC Mechanic: Gary, ASE Certified Technician replied 6 months ago

you have a programming scan tool to load the programming into the then plug in and program the computer to your trucks VIN number ?

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Customer reply replied 6 months ago
I have the tools but neither the programming tool nor my scan tool communicates. I though maybe I was missing something
GMC Mechanic: Gary, ASE Certified Technician replied 6 months ago

did it ask you to request current info out of the computer then it will ask if the VIN number is ***** ?

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Customer reply replied 6 months ago
Can't get that far. As soon as the programmer asks that the new ecm be connected, it cannot communicate with the new one.
Customer reply replied 6 months ago
power and ground good on the DLC
GMC Mechanic: Gary, ASE Certified Technician replied 6 months ago

then you will need a scan tool to program this computer or have a shop program it for you

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