✅ Fixed
Car USB charging diagnosis: 1) Try different cable — cables fail more than ports. 2) Try different phone. 3) Check if USB works for audio/data even if not charging. 4) On dual-function ports: charging mode vs data mode may need switching. 5) Port may need
Car USB charging diagnosis: 1) Try different cable — cables fail more than ports. 2) Try different phone. 3) Check if USB works for audio/data even if not charging. 4) On dual-function ports: charging mode vs data mode may need switching. 5) Port may need infotainment system running. 6) Check 12V socket fuse (powers USB ports on many vehicles). 7) USB port contacts bent or corroded: inspect with flashlight, straighten carefully. 8) Aftermarket USB charger in 12V socket: more reliable than built-in ports, $10-20, higher amperage for fast charging (2.4A minimum for modern phones).