Locked out of your General Motors stereo after a battery change? Here's exactly what to do.
If your General Motors radio is showing "LOC" and won't play, it has activated its anti-theft lock — usually after a dead or disconnected battery. You'll need your factory unlock code to get it working again. Here's how.
GM vehicles (Chevrolet, GMC, Buick, Cadillac, Pontiac and more) use the "TheftLock" system. With the ignition on and the radio showing LOC, hold presets 2 & 3 (or 1 & 4) to reveal the serial number.
Send us your General Motors radio serial number (or VIN where applicable) and we'll look up the correct factory code and email it to you. Standard delivery is 30 minutes to 24 hours, 7 days a week; Express is guaranteed within one hour during business hours.
Enter your code with the HR and MN (hour/minute) buttons. After too many wrong tries the radio shows INOP — leave the ignition on for an hour to reset.
We've supplied factory car stereo unlock codes since 1998, with a money-back guarantee if we can't retrieve a working code. Thousands of General Motors owners have used us to get their radios playing again.
Need help entering it? See the General Motors input manual.