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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15133
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 1996 C3500 6.6 Diesel, Three scan tools will not

Customer Question

I have a 1996 C3500 6.6 Diesel, Three scan tools will not communicate with the truck. One thing I found is that the number 5 pin signal ground is not grounded. Can I run a new ground for this pin.
Submitted: 14 days ago.
Category: Chevy
Expert:  Juan Crespo replied 14 days ago.

Hi there.

Perhaps I can help. Can I ask what is it you're trying to diagnose?

Customer: replied 14 days ago.
My scanners with not do any kind of diagnose with the truck all 3 will power on but no communications. same as my first question.
Expert:  Juan Crespo replied 13 days ago.

Based on your reply, I don't think I can help you. I'll opt out so others can try. Please don't rate or reply until another expert responds or the site will cycle this back to me.

Expert:  david craig replied 13 days ago.

Hi Im David , so you're not getting a ground on pin 5 of the dlc?

Expert:  david craig replied 13 days ago.


Expert:  david craig replied 13 days ago.

do you still need assistance?

Expert:  david craig replied 11 days ago.


Customer: replied 10 days ago.
i still need help was out of town for a few and no ground on pin 5 of dic
Expert:  david craig replied 10 days ago.

OK. im going to pull up a print and we'll get this thing fixed.

Customer: replied 10 days ago.
sounds good to me this truck is driving me crazer
Customer: replied 10 days ago.
the main thing that I need is for the abs pump to cycle to bleed the brakesBut the new scaner that will do the job will not connect to the truck
Expert:  david craig replied 10 days ago.

ok. there only thing it says for 5 is its a signal ground and doesnt show where it goes. it obviously has to go to the pcm so ive attached the pcm pin outs and the only grounds are on connector c3. i believe thats going to be where it goes.

Customer: replied 10 days ago.
Thanks for your help will check it out tomorrow and will let you know what happens.
Expert:  david craig replied 10 days ago.

you're welcome. its gotta be broken between the dlc and pcm

Expert:  david craig replied 9 days ago.

any luck?

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