Symptoms
- Radio screen displays 'CODE' or 'LOCKED' message
- Radio worked fine before a battery disconnect or replacement
- Radio won't play any audio until the code is entered
- No obvious damage or other electrical issues
Likely causes
- CommonBuilt-in radio anti-theft lock triggered by power lossMany factory radios are designed to lock themselves if disconnected from power to deter theft.
- CommonLost or unknown radio codeThe code is usually a small card or sticker from when the car was new, easily misplaced over the years.
What to do
- Check the glovebox, owner's manual, or a card that may have come with the vehicle for the radio code.
- Check the VIN-based lookup some manufacturers offer online or through their customer service for the radio code.
- Contact the dealership with your VIN if you can't find the code, since they can often look it up.
- Enter the code exactly as instructed in the manual, usually using the radio's preset buttons or a code entry screen.
- Avoid repeatedly entering wrong codes, since many systems lock out after a few failed attempts and require a longer wait or dealer visit.
- If the radio locks out after failed attempts, wait the specified time (often an hour) before trying again.
- Have a dealer or locksmith retrieve the code if all other options are exhausted.
- Consider writing down and storing the code somewhere safe once retrieved for future reference.
Tools and parts
- Owner's manual
- VIN number
When to call a pro
A dealership can usually retrieve a lost radio code using the VIN if you can't find the original card.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.