Driver door ajar on 2004 Chevrolet Avalanche 1500

All of a sudden the Driver door adjar alarm is on and want go off. Checked door several times, door is closed, still getting alarm. Disconnect the negative post on battery, no help. Disconnected both post of battery and no help. Any Ideas???

You could have a failed door ajar switch inside the drivers door of your 2004 Chevrolet Avalanche - not very easy to replace. If you decide you need the help of a repair shop please use the following link to find one near you -
1 more answer
try spraying wd 40 in you latch to clean it an open and close door a few times to lube it