What to do if my Pioneer Car Receiver shows 'CHECK USB'?
- MMichelle HannaAug 14, 2025
If your Pioneer Car Receiver displays 'CHECK USB', it could indicate a short circuit in the USB connector or cable. Ensure the connector and cable aren't trapped or damaged. Alternatively, the connected USB device might be drawing too much power (over 500mA). Disconnect the USB device, turn the ignition off then on, and only use compliant USB storage devices.