If your vehicle is showing usb ports or 12v cigarette lighter outlets have no power, here are the most likely causes and the parts you'll need to fix each one.
The most common reason for dead power outlets is a blown fuse. This is usually caused by plugging in a faulty phone charger, overloading the circuit with a high-draw accessory, or a coin falling into the 12V socket and shorting it out.
If the radio, center console, or dashboard was recently removed for maintenance or upgrades, the wiring connector for the power outlets may have been accidentally left unplugged during reassembly.
A relay acts as a switch that sends power to these outlets only when the ignition is turned on. If this relay burns out or fails, the outlets will remain dead even when the car is running.
Repeated plugging and unplugging, aggressive force, or spilled liquids can physically break the internal contacts of the 12V socket or the USB port module itself.
In modern vehicles, the BCM or smart junction box manages power distribution to USB ports and accessories. A software glitch or internal hardware failure here can cut power to these specific circuits.