1. Steering Wheel Lock:
* Try gently jiggling the steering wheel: The steering wheel lock mechanism may be engaged. Try turning the wheel slightly back and forth while attempting to turn the key.
2. Shift Lever (Automatic Transmission):
* Ensure the gear selector is in Park (P): The key won't turn unless the transmission is in Park. If it's in Neutral (N), try shifting to Park.
3. Ignition Switch Problems:
* Worn or damaged ignition switch: This is a common cause. The switch itself might be failing, preventing the key from turning. This often requires professional repair or replacement.
* Broken or jammed ignition tumblers: Internal components of the ignition cylinder may be broken or jammed, preventing the key from turning. Again, this usually needs professional attention.
* Faulty ignition lock cylinder: The whole cylinder may need replacement.
4. Key Issues:
* Incorrect key: Make absolutely sure you're using the correct key for your Cobalt.
* Broken or worn key: A damaged key might not engage the tumblers properly.
* Key fob issues (if applicable): If your key has a remote, a low battery or malfunctioning remote might prevent the car from starting. Try replacing the battery in the remote (if it has one).
5. Electrical Problems:
* Low battery: A weak battery might not provide enough power for the ignition system to function correctly. Check your battery voltage.
* Faulty ignition system components: Problems with other electrical components related to the ignition system (such as the ignition coil or starter) *could* indirectly prevent the key from turning, though this is less likely.
What to do:
* Start with the simple checks: Steering wheel, gear selector, and key condition.
* Check the battery: A low battery is an easy fix, but it can cause a lot of strange problems.
* If none of the simple checks work: It's highly advisable to have your Chevrolet Cobalt checked by a qualified mechanic or locksmith. Attempting complex repairs yourself could cause further damage. They have specialized tools and knowledge to diagnose the problem accurately.
Ignoring the problem can leave you stranded, so it's best to address it promptly.
