There are a few possibilities:
1. Battery connections. Check if battery terminals are clean and secure. Repair as necessary.
2. Faulty ignition switch.
3. Starter or its curcuit.
4. Security system.
5. Battery. If it is a maintenance free battery, it can fail one moment and starts working the next.
6. Park Neutral Position switch.
Some of above components might not be really faulty but due to weather, they might fail intermittently.
When problem occurs you need to test if starter is getting power.
Check battery voltage.
Note if the security system is armed.
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Wednesday, December 22nd, 2010 AT 1:31 PM