Why does my garage door remote work but the keypad doesn't?

If your garage door remote works but keypad doesn't, problem is isolated to keypad itself, its battery, programming, or signal, not opener power or logic board, since remote uses same radio receiver that is working. The most common cause is dead battery in keypad, as wireless keypads use 9-volt, AAA, or coin cell battery that lasts 1 to 3 years, and when battery dies, keypad lights dim or don't light and door won't open with PIN, while remote with separate battery still works, so replace keypad battery with same type costing 3 to 10 dollars. Keypad may have lost programming due to power outage, pressing Learn button too long erasing memory, or battery removed too long, requiring reprogramming by pressing Learn button on opener motor unit and entering PIN on keypad within 30 seconds and pressing Enter until opener light blinks. Wall console may be in lock mode that disables keypads and remotes, but since remote works, lock mode less likely, though some consoles disable keypad separately, so check lock button. Radio interference or antenna wire damaged can affect keypad range more than remote if keypad farther. Keypad buttons worn after years of use cause poor contact where PIN entry fails, indicating button failure needing keypad replacement costing 30 to 60 dollars. Water intrusion from rain if keypad seal fails corrodes board causing failure while remote unaffected. Check if keypad is too far from opener or blocked by metal. Try entering PIN close to garage to test range and reprogram.