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After installing an aftermarket radio my obd2 port stopped…

Customer Question
After installing an aftermarket...

After installing an aftermarket radio my obd2 port stopped communicating

Mechanic's Assistant: Is this an aftermarket stereo, or did it come with the car?

Aftermarket stereo

Mechanic's Assistant: What is the make/model/year of your car?

2004 chevy Silverado

Mechanic's Assistant: Are you fixing your Silverado yourself? What have you tried so far?

Yes

Submitted: 24 days ago.Category: Chevy
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Answered in 1 minute by:
3/27/2018
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 24 days ago
Canuck Tech
Canuck Tech, Auto Mechanic
Category: Chevy
Satisfied Customers: 694
Experience: 20 years experience in tune up, electrical and general repair
Verified

Hi there - let me have a look at the wiring schematic for you... back shortly

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Customer reply replied 24 days ago
Okay
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 24 days ago

Have you checked any fuses?

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Customer reply replied 24 days ago
I’ve checked all the fuses and they all test good.
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 24 days ago

Does the scan tool power up, but just no communication?

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Customer reply replied 24 days ago
the scan tool I use is a tech 2 it powers up but won’t communicate at all.
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 24 days ago

Does the new radio work? I'm just narrowing down the possibilities here...

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Customer reply replied 24 days ago
the new radio powers up but I removed it to install the old one again to see if that would fix anything and the old radio won’t power up just shows the time and the cd eject works
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 24 days ago

There would have been an orange wire that was plugged into the original radio. How did yo deal with it? That is the network wire. If it is shorted to ground, that could stop communication

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Customer reply replied 24 days ago
I have a completely separate harness for the new radio I haven’t cut any wires and the orange wire is un tapered with.
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 24 days ago

Does the check engine light still illuminate, and does the truck still run? Again, just running through the possibilities.

Given you have a tech 2, I'm assuming you are in the business...

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Customer reply replied 24 days ago
There is a check engine light the stays on and the truck will start then die immediately but the anti theft light only stays on for a split second
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 24 days ago

Did you change out any amps, or anything else related to the stereo system?

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Customer reply replied 24 days ago
Nope I left all of that alone
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 24 days ago

I think the class 2 data line is shorted to ground, but i don't know how that would happen. You have the CANdi module installed on the Tech 2?

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Chevy Mechanic: Canuck Tech, Auto Mechanic replied 24 days ago

OK - I'm gonna release this question. We have some other excellent GM techs who may have seen this exact issue.

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Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago
Todd Audette
Todd Audette, Chevy Technician
Category: Chevy
Satisfied Customers: 416
Experience: Chevrolet Technician
Verified

Hi my name is***** me a few minutes to review all of this and let me see if i can help you

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Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

Was this a plug direct in radio that you installed

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Customer reply replied 24 days ago
it was
Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

Stand by

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Customer reply replied 24 days ago
I’ve already tried doing that and the tech 2 still can’t find any. Communication
Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

Have you checked the tech 2 in another vehicle

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Customer reply replied 24 days ago
it works just fine no problems with any other vehicle
Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

You disconnected all of the modules in both schematics?. Something is shorting that data line. That's the only possibility

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Customer reply replied 24 days ago
I’ve already checked all the modules
Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

Even the Onstar and the amp if equipped

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Customer reply replied 24 days ago
Not the on Star is doesnt seem to be on but I’m not entirely sure
Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

It doesn't matter if it's on it's still on the data line

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Customer reply replied 24 days ago
Well I haven’t checked the on Star
Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

You will have to unplug it. Do you need the location of it

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Customer reply replied 24 days ago
No I don’t
Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

Okay...let me know where you are at with this

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Customer reply replied 24 days ago
That didn’t work
Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

Try this real quick....Take the candi module off

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Chevy Mechanic: Todd Audette, Chevy Technician replied 24 days ago

You will have to follow this procedure step by step in order to figure this out

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Chevy Mechanic: Todd Audette, Chevy Technician replied 23 days ago

Just following up to see if you have made any progress

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Customer reply replied 23 days ago
No progress yet nothing seems to be working
Chevy Mechanic: Todd Audette, Chevy Technician replied 23 days ago

What was the initial reason for replacing the radio

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Customer reply replied 23 days ago
I replaced the radio because I wanted to have my subs installed
Chevy Mechanic: Todd Audette, Chevy Technician replied 23 days ago

Did you disconnect the Body Control Module

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Customer reply replied 23 days ago
I did
Chevy Mechanic: Todd Audette, Chevy Technician replied 23 days ago

Give me the VIN

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Chevy Mechanic: Todd Audette, Chevy Technician replied 23 days ago

Does this vehicle have XM

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Customer reply replied 23 days ago
I believe it does have xm radio
Chevy Mechanic: Todd Audette, Chevy Technician replied 23 days ago

That's why i wanted the VIN.....to see if it did

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Customer reply replied 23 days ago
Gotcha
Chevy Mechanic: Todd Audette, Chevy Technician replied 23 days ago

There is a whole other receiver for that if it is equipped and it's also on the same data line

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Customer reply replied 23 days ago
Okay so how should I go about fixing my truck?
Chevy Mechanic: Todd Audette, Chevy Technician replied 23 days ago

I just wanted you to try and disconnect it if it has one...I'ts behind the glove box

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