Replacing my delco radio in my 2004 chevy silverado the radio says locked.. how do i unlock it

In order to get the code you need to go to a Chevy dealer with the VIN of the car it came in, the number from the radio and proof of ownership. The have a "dealers only" number to call the radio manufacturer to get the codes. I hope this helps, take care. If you have more questions or just want to say Hi! Use testimonial to comment. Thanks.

I am guessing you meant spark plug. Your truck calls for an Iridium plug. I would strongly recommend replacing them with the original equipment which is an AC Delco 41-110. They are available at most auto parts stores and run about $6.99 ea. If you're replacing the distributor cap, try to use one with brass contacts as they have far less problems with the spark arcing through the cap.

try 1234 its the factory default code for alot of their headunits

take it out call the dealer with serial number and theyl give u the code

are u the original owner of the car ?if so do you still have the books that came with the car? look for the delco radio book !there should be a card in there with a code and instructions! if not the only wasy is to go to the dealer or a radio repair shop to have it unlocked!

shouldnt have to pay notify a chevy dealer in person for code most dealers wont deal with a code problem over phone they dont charge for the code due to the fact that a dead battery can also lock out the radio system into the anti-theft mode

The codes for the radio are in the back of the owners manual.

Read the car manual, in the page were it shows the dashboard fuse panel find the radio fuse pull it out and put it back in with the fuse tool. This resets your radio, it did the trick for me with.
Just make sure if you disable the radio security lock if it enabled before you pull the fuse. It may lock you out, all the information is in the manual.
Good luck and hope this helps.

1 have h3 hummer and replaced the radio (ac delco) and is locked,i need to unlock it

I've heard of people using Delco Lock Codes (http://www.delcolockcodes.com) to get their radios unlocked. They seems like a legit site from what I've read. Good luck!!