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2003 Chevy Silverado 2500hd

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Old 09-08-2018, 08:35 PM
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Default 2003 Chevy Silverado 2500hd

I have a 03 Silverado 2500hd, I have been having problems for a while,it has been misfiring, I changed plugs wires, coils fuel filter and fuel injectors, now I am getting a u1003 code. Loss of communication with Powertrain multiple control system. And anyone know what is could be? All the wires look good
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Old 09-09-2018, 12:47 AM
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What engine?

How many miles on it?

How long have you owned it?

How many miles have you owned it?
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Old 09-09-2018, 07:24 AM
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Default 2003 Chevy Silverado 2500 hd

It has about 110000 miles
its a 6.0
i have had it for about 2/12 to 3 years
i have put on about 30000to 40000 Milesí* on
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Old 09-09-2018, 08:31 AM
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That is the ONLY code?

Clear code and see if that is the only one that comes back....
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Old 09-09-2018, 08:46 AM
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It has had a code po300 also but hasnít come back on
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Old 09-09-2018, 08:49 AM
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I have cleared it 5 times or so it comes back on, very frustrating
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Old 09-09-2018, 09:28 AM
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First check to make sure mice have not eaten wires. Then check to see if your grounds are in good shape. Check your in and around the fuse box. Something is not letting it communicate. You might end up having to replace the interior box if are are sure all your wires are good
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Old 09-09-2018, 05:49 PM
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Originally Posted by Seanjordan20 View Post
First check to make sure mice have not eaten wires. Then check to see if your grounds are in good shape. Check your in and around the fuse box. Something is not letting it communicate. You might end up having to replace the interior box if are are sure all your wires are good

Is is the pcm the interior box? Iím not sure where to start looking
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Old 09-09-2018, 06:24 PM
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No the interior fuse box is when you first open the driver door. On the side of the dash.

Start by looking at your wires and grounds under the hood. Make sure they are not chewed or rusted/oxidized.
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Old 09-09-2018, 09:00 PM
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Originally Posted by Seanjordan20 View Post
No the interior fuse box is when you first open the driver door. On the side of the dash.

Start by looking at your wires and grounds under the hood. Make sure they are not chewed or rusted/oxidized.
How many grounds are there, do I check around certain censors, pcm, does the pcm have a ground wire? I looked online the u in code u1003 is for transmission do I look around down there
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