When one specific duplex outlet or one side of a room stops working while adjacent outlets function normally, it usually indicates a localized break in electrical continuity or hardware failure. Common causes include a loose wire terminal screw on the back or side of the receptacle where branch wires have shaken loose from vibration, a broken tab connecting the top and bottom receptacle halves on a split-wired outlet, or a damaged wire inside the wall box. You can troubleshoot outlet failures safely by shutting off power at the circuit breaker before opening the wall plate. You can verify that your corrective action is successful when pulling the receptacle out of the junction box, securing loose wire connections to the terminal screws, and restoring power returns steady illumination and voltage to both sides of the outlet.
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