![]() Hold until "" displays on the radio screen. For example, you may choose a number such as Press and hold the number "1" and "4" preset buttons on the radio simultaneously. Create a three or four digit number that you can use to unlock the radio if the stereo loses power. It's important to know how to set the radio unlock code for your GMC and to enter it when the radio locks. In order to use the GM stereo, once locked, you must enter the radio unlock code successfully using specific buttons on the stereo. This protects the stereo from unauthorized use if stolen. When programmed, the stereo system becomes inoperable if the stereo ever loses power from battery disconnection or stereo removal. GM vehicles, including GMC trucks, include a radio theftlock system that allows you to program a radio unlock code into your stereo system. ![]()
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