2000 Jeep Grand Cherokee Key won't turn in the ignition

Keyless Remote Key Programming Procedure:

1. Insert first programmed key into ignition and turn ignition switch to ON for 5 seconds. ...
2. Turn ignition switch to OFF and remove key.
3. Insert second programmed key into ignition and turn ignition switch to ON. ...
4. Turn ignition switch to OFF and remove key.

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Key Fob Keyless Entry Remote for 2008 Jeep Grand ...

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wiggle steering wheel this time.
if dual cut key try inverting key, or use the spare key.

First thing you need to try is wiggling the steering wheel back and worth while turning the key to try and unlock the steering column. If the key is worn out it may not turn well in the ignition. Another thing is to lubricate the ignition cylinder. If nothing works, it maybe the ignition cylinder tumbler is worn out and needs to be replaced.

If you don't have a check engine light that lights up on the dash when you turn your ignition key to on, then your ecu has gone bad, internally.

your ignition barrell tumblers are getting stuck, you need to replace the barrell and tumblers at dealership. you can get the key to turn if you hold key in ignition and try and turn and at the same time tap the end of the key which normally jogs the tumblers to enable key to turn

Adjust the ignition switch on the column underneth

Check the brake light switch, located under the dash above the brake pedal. The other noise may not even be related to brake lights staying on

Usualy a faulty headlamp switch assembly

Do you have an alarm on this? If you do, that is most likely the problem. There seems to be a problem with the alarms. You may want to have a new key made just in case. Sometimes the keys are magnetically charged and after time, it wears off.

usually the engine relay or cooling fan relay..!