My garage door is closing at an angle. How can I fix it?

If your garage door is closing at an angle, meaning one side reaches the floor before the other and the door looks crooked when closing, the cause is usually uneven cables, loose tracks, or a broken spring causing imbalance. First, stop using the automatic opener and pull the emergency release cord to disconnect, as operating a crooked door can damage panels and opener. Visually inspect cables on both sides that wrap around drums above the door or run through extension pulleys; if one cable is slack, frayed, or off its drum, that side will lag and cause angle closing. If a torsion spring is broken, door will be heavy on one side and close at angle. For safety, clamp locking pliers onto tracks below rollers to prevent falling. If tracks are loose, tighten the mounting bolts and ensure vertical tracks are plumb using a level. If a cable has come off the drum, you must release spring tension with winding bars to reseat cable, which is dangerous and should be done by professional costing 150 to 300 dollars for cable repair. If rollers are worn or bent track causing binding on one side, straighten track gently or replace rollers. After fixing cables and tracks, manually lift door halfway to check balance; door should stay level and not drift. Lubricate rollers and hinges with silicone. Reconnect opener and test. If door still closes at angle after basic tightening, call professional to check spring tension and cable length equality.