03 chev silverado radio on but no sound

I have no idea which radio option you have in the truck, but it won't be a switch.There should be a fader control on the radio that controls the balance between the front and back speakers, and it may be turned or set all the way to one end (front speakers only). Check your owners manual, and if you don't have one, Google it for a download.

I would say that the factory amplifier is not functioning. All sounds go through the radio, including the chimes.

It could be a bad amp. Those come with a factory amp usally right behind the radio. Hopefully you can find a used one from a scrap yard. Click Here to search in your area.

No solution but same problem. However mine intermittent. It will come on and run the passenger side speakers and then shut off. All panel displays are on. Next day same thing. I think it has something to do with weather. When it is below 30 deg it doesn't work. When it gets 45 deg and up it works somewhat. It sounds like a bad circuit board connection.

How to Reset GM Theft lock Radio's
Article Disclaimer: This article is meant to be used by Delco Radio owners to reset there radios. In no way is it meant to be used for any unethical or unlawful ways.

Purpose
The following instructions will allow you to reset any GM (General Motors), Cadillac, Oldsmobile, Buick, Pontiac theft lock radio.

Requirements
The theft lock radio must be in "LOC" mode.

Procedure:
1. Turn the ignition ON (The radio should display "LOC")
2. Hold down the Radio Presets 2 and 3 buttons for six seconds
3. The radio display changes from LOC to a three-digit number. Write this number down. You now have fifteen seconds to complete the next step.
4. Press the AM/FM button
5. The radio display changes to another three-digit number. Write this number to the right of the first one
6. You now have a six-digit number, the first three digits are from STEP 03 and the last three digits are form STEP 05
7. Call 1-800-537-5140
8. Press 1 then # (pound). You'll hear "Invalid Code, try again"
9. Press 139010 or 106010 or 206010 or 202107 then # (pound). You will be asked to enter your four or six digit code followed by *
10. Enter the number from STEP 6 then *
11. Listen to the four-digit number and write it down. It will be repeated twice
12. Turn the ignition ON (The radio displays LOC)
13. Use the MN and HR buttons to enter the code from STEP 11
14. Press the AM/FM button. The radio display changes to "SEC". Your radio is now "un-locked" and usable.

Dealership Codes
139010
106010
206010
202107

Troubleshooting
If you fail to enter the correct code eight times, the radio goes into INOP mode. You have to wait an hour with the ignition on before the radio returns to LOC mode.

To Read the original article or read similar articles please visit kingbain.com/how-to/unlock-gm-theftlock-radio-s

Good luck (remmeber comment and rated this).

Check if any mute function is not activated.

Most likely cause is a faulty oil pressure sending unit.

Have you checked the fuse?

No it cannot but if you go on ebay im sure you can find a cheap replacement.

More than likely with a 2003, the speakers that cut out are in the door or doors. Do they cut out of both speakers?

If they cut out of one, then you may have an intermittent speaker ( the wire to the cone becomes partially connected)

If both speakers turn off at the same time and you hear NOTHING on all speakers, then you more than likely have an intermittent connection on the radio itself and probably replacement is probably cheaper than fixing the radio.

One more thing
Factory radios sometimes have an amplifier in them. Sounds funny but they call the Radio in the dash the Head Unit and the amplifier is buried in the dash. You could have a bad amplifier or a loose power connection to it, but that is very unlikely.

Hope this helps.

E
E