Loud Bang From the Garage Door
A sudden loud bang from the garage often indicates a serious mechanical issue, most commonly a broken spring. This guide explains the likely causes, what to check safely, and when to call a professional.
Common Causes of a Loud Bang
- Broken torsion spring: The most frequent cause; springs snap under tension
- Extension spring failure: Can recoil violently if safety cables are missing
- Loose or failing hardware: Hinges, brackets, or bolts popping under stress
- Door slamming shut: Caused by spring failure or cable issues
- Opener chain or belt slipping: Sudden jerks can create loud impacts
Signs the Spring Has Broken
- Door feels extremely heavy or won’t lift at all
- Opener hums or strains without lifting the door
- Visible gap in the torsion spring above the door
- Extension spring hanging loose or stretched
- Door slams shut or drops suddenly
A broken spring is dangerous — do not attempt to operate the door with the opener.
Other Issues That Can Cause a Bang
- Cable failure: Frayed or snapped cables whipping against the track
- Roller popping out of the track: Creates a sharp impact sound
- Track misalignment: Door binding and releasing suddenly
- Loose hardware: Hinges or brackets shifting under load
Safe Checks You Can Perform
- Look for a visible gap in the torsion spring
- Inspect cables for fraying or slack
- Check if the door is crooked or uneven
- Try lifting the door manually — stop if it feels heavy
- Look for rollers off-track or hardware hanging loose
Do not touch springs, cables, or tensioned components.
What You Should Not Do
- Do not attempt to open the door with the opener
- Do not try to lift a heavy or stuck door alone
- Do not attempt spring or cable repairs yourself
- Do not force the door if it binds or resists movement
When to Call a Professional
- Broken torsion or extension spring
- Door is too heavy to lift manually
- Cables are frayed, loose, or snapped
- Door is crooked, jammed, or off-track
- Opener strains, hums, or stops mid‑lift
A loud bang from the garage is almost always a sign of a serious mechanical failure. Prompt inspection and professional repair will restore safe, reliable operation and prevent further damage.