Why can't the car key turn and the engine won't start?

[McFinley]

The reason why the car key can't turn and the engine won't start after inserting the key is that the steering wheel lock is jamming the key. Unlocking method: When the steering wheel is locked and the car key can't turn, hold the steering wheel with your left hand and gently shake it while simultaneously turning the key left and right with your right hand to unlock it. Steering wheel lock mechanism: After the car is turned off, if you rotate the steering wheel from its centered position to one side (usually to the left) by a certain angle, the steering wheel will make a "click" sound and lock into place. In this locked state, the steering wheel won't move and the key can't turn. To unlock, hold the steering wheel with your left hand, gently shake it while simultaneously wiggling the key with your right hand.

[DelDakota]

I've seen this situation quite often. When the key won't turn, it's usually because the steering wheel is locked as part of the car's anti-theft system activation. You might have forgotten to gently wiggle the steering wheel to lock it when parking. Now, just try gently turning the steering wheel left and right while attempting to turn the key to unlock it. If the key turns but the car still won't start, it might be related to a dead battery, especially in cold weather which can easily drain the battery. Check if any dashboard lights come on - if not, it's likely a battery failure; if lights come on but starting is difficult, it could be an ignition system issue or starter motor problem. I recommend first trying to jump-start the car with help from a friend. If that doesn't work, take it to a repair shop to check the battery and electrical connections. Don't force the key as you might damage the key slot. Develop good parking habits to avoid locking the steering wheel too tightly.

[VanSilas]

I've personally experienced the issue where the key won't turn, and I was quite anxious at the time. The main cause turned out to be the steering wheel being locked. Try jiggling the steering wheel while turning the key—that usually solves it. If the key turns but the engine won't start, then you need to consider the engine starting system. It could be a dead battery—I keep a portable jump starter in my car, and connecting it usually does the trick. Alternatively, it might be a problem with the spark plugs or fuel pump, which requires professional diagnosis. For a quick self-check, listen for the starter motor sound when turning the key. If you hear it, the electrical connection is fine, but there's an issue with fuel or ignition. No sound means the battery or wiring is disconnected. If this happens while driving, stay calm, ensure you're in a safe parking spot, and then proceed with checks.

[MadelineFitz]

The root cause is often the activation of the anti-theft lock cylinder or steering wheel lock. Gently shaking the steering wheel can release the lock. Simultaneously, if the car won't start, it's likely due to a weak battery, especially common in older cars during winter. Check if the dashboard lights are on. If they're completely dark, the battery is probably the issue; if the lights are on but the car won't start, inspect the ignition coil or starter. Quickly find a nearby auto repair shop or call for roadside assistance to avoid breaking down on the road. Timely action can save more on repair costs.