Remote start not working can refer to garage door remote or car remote start, but common causes include battery, programming, interference, and vehicle conditions that prevent operation. For garage door remote start not working, causes include dead battery in remote, remote lost programming due to power outage or pressing Learn button too long erasing memory, lock mode engaged on wall console that disables remotes indicated by blinking light, radio interference from LED bulbs in opener that block signal, and damaged antenna wire on opener reducing range, so replace battery, reprogram via Learn button, unlock wall console, and ensure antenna hangs down. For car remote start not working, causes include dead key fob battery, car battery low, check engine light on that disables remote start for safety, hood or door not fully closed that prevents start, car not in Park, brake pedal pressed, or too many failed attempts causing system to lock out, requiring manual start to reset. Car remote start also fails if key fob out of range, interference from other devices, or aftermarket alarm interfering. Extreme cold can cause car battery weak and prevent remote start. To diagnose, check car dashboard for warning lights, ensure all doors and hood closed, replace key fob battery, and try manual start. For both, try close range, as distance reduces signal. If remote damaged from drop or water, replacement needed costing 30 to 60 dollars for garage remote and 100 to 300 dollars for car fob.
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