Symptoms
- Radio shows 'CODE' or 'LOCKED' after reconnecting the battery
- Clock and radio presets reset to default
- Power windows or sunroof lost their one-touch auto feature
Likely causes
- CommonRadio anti-theft feature triggered by power lossMany older and some newer stereos require a code re-entry any time they lose power completely.
- CommonVolatile memory reset for clock, presets, and seat/mirror memoryThese settings aren't saved when battery power is fully cut and simply need to be re-entered.
- CommonWindow/sunroof auto-up/down feature disabledMany vehicles need a specific relearn procedure for one-touch window and sunroof features after a battery disconnect.
What to do
- Find your radio code, often in the original owner's manual packet, glovebox documents, or by contacting the dealer with your VIN.
- Enter the radio code as instructed on the display, usually via the radio's number presets or volume/tuning knobs.
- Reset the clock and re-save any radio station presets you use regularly.
- For power windows, consult your manual for the relearn procedure, which usually involves holding the switch up/down at the end of travel for several seconds.
- If your car has a sunroof with a similar auto feature, look up the specific relearn steps for your model.
- In the future, consider using a small memory-saver device plugged into the OBD-II or accessory port before disconnecting the battery to avoid these resets.
Tools and parts
- Memory saver device (optional)
When to call a pro
If you don't have the radio code and the dealer can't retrieve it with your VIN, a locksmith or stereo shop may be able to help.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.