Symptoms
- System shows 'no map data' or 'card error' message
- Navigation feature is greyed out or missing
- Card was recently removed and reinserted
- Error appears intermittently while driving
Likely causes
- CommonDirty or debris-filled card slotDust and lint can prevent the card's contacts from making a solid connection.
- CommonCard removed or handled incorrectlyRemoving the card while the system is on, or touching the gold contacts, can cause read errors.
- PossibleCorrupted or outdated map data on the cardMap cards can become corrupted over time or need an official update file.
- Less commonFailed card reader in the head unitThe physical card reader mechanism can wear out or fail after years of use.
What to do
- Turn the car off before removing the map card, and avoid touching the gold contact strip.
- Gently clean the card's contacts with a dry, lint-free cloth and reinsert it firmly.
- Check the card slot for visible dust or debris and clean carefully if accessible.
- Restart the system after reinserting the card to see if it's recognized.
- Check the manufacturer's website to see if a card update or replacement is recommended for your system.
- If the card works in another compatible unit but not yours, the head unit's card reader may be at fault.
Tools and parts
- Lint-free cloth
Navigation SD/map cardSearch: “OEM navigation map SD card for your car make, model, and year”
When to call a pro
If a clean, known-good card still won't read, a dealer can inspect the head unit's card reader.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.