How to get garage door back on track after pulling cord?

To get garage door back on track after pulling the emergency release cord, which is the red cord that disconnects the trolley from the opener, you need to re-engage the trolley and ensure door is aligned, as pulling cord itself does not cause off-track but manual operation while disconnected can. First, if door is actually off track with rollers out of tracks, stop and fix track issue before re-engaging opener, by closing door if possible, clamping locking pliers on tracks below rollers to prevent falling, loosening track bolts slightly, and guiding rollers back into track channel with help, then tightening bolts. If door is still on track but disconnected from opener after pulling cord, you can reconnect by pulling the emergency release cord toward the door or toward the opener, depending on model, to set trolley into reconnect position. Then run the opener using wall button or remote; the trolley will slide along rail and click back onto the opener carriage with an audible click, re-engaging automatic operation. If trolley does not reconnect automatically, manually lift door slightly until trolley aligns with carriage and clicks. After reconnecting, test door operation automatically several times to ensure smooth travel. If door was forced off track while disconnected, you must realign tracks first, as running opener with off-track door can damage opener and panels. Professional re-engagement and track realignment costs 100 to 250 dollars if needed.