How to Diagnose an Ignition Key That Won’t Turn

key turning in ignition

It can be a frustrating experience when you first insert your key into your car and it fails to turn in the ignition. Your mind races with all the possibilities of what could be going wrong with the car. Luckily, most ignition key issues are not only common, but are also quick to fix. There are three easy factors to remember when looking over why your key will not turn, and with some troubleshooting, these tips could lead you to starting and driving off safely in just a few short steps.

The three reasons why an ignition key will not turn include: problems with supporting components, issues with the key itself, and ignition lock cylinder problems.

  • Tip: Always make sure your parking brake is on to keep the vehicle secure when following these steps.

Reason 1 of 3: Supporting component problems

Supporting components are other parts in your car that may be making it difficult for the key to turn. They are the most common culprits behind your car key being unable to turn in the ignition and also the quickest to identify. There are three components to be aware of:

turning the key in the ignition and turning the steering wheel

Component 1: Steering wheel. In many vehicles, removing the key locks the steering wheel. Occasionally, because of this lock, sometimes the steering wheel can get stuck, which in turn means the vehicle key also becomes stuck and cannot move to release it. “Jiggling” the steering wheel while also attempting the turn the key can relieve this lock pressure and allow the key to turn.

Component 2: Gear selector. Some vehicles do not allow the key to turn unless the vehicle is in either a park or neutral gear. If the vehicle is in Park, shake the shifter slightly to ensure it is in the right position and try again to turn the key. This only applies to automatic driving cars.

Component 3: Battery. If the car battery is dead, you will often notice that the key won’t turn. This occurs often in higher end vehicles. Checking the life of your battery will verify this.

Reason 2 of 3: Issues with the key itself

bent key hammered on block of wood

Oftentimes, the problem is not with the supporting components of the car, but with the vehicle key itself. The following three factors may explain why your key is unable to turn in the ignition:

Factor 1: Bent key. Bent keys can sometimes enter the cylinder but once inside they will not line up correctly to allow the car to start. If your key looks visually bent, you can use a non-metal hammer to flatten key down. Your goal is to use something that will not damage the key, so ideally this would be made of rubber or wood. You can also place the key on a piece of wood to cushion to blow. Then, very carefully, tap the key until it is straight and attempt to start the car again.

writing down a VIN from door jamb

Factor 2: Worn out key. Keys that are worn out are actually very common. If your vehicle key is worn out, this will not allow the pins inside of the cylinder to drop correctly and start the car. If you have a spare key, attempt that first. If you do not, you can obtain a spare key by writing down your car’s Vehicle Identification Number (VIN), which is found on the driver’s side windshield or inside the door jamb. You will then want to contact your dealership to get a new key made.

  • Some newer cars have key codes attached to a set of keys. If your key is worn out and you need a new one, you can give this code to your dealership instead of the VIN.

Factor 3: Incorrect key. Sometimes the wrong key can get inserted into the cylinder. This happens more often when someone has more than one car key on their key ring. Many keys look similar, especially if they are from the same make (such as two Honda keys, or two Ford keys). So double check the correct key is being used to try to start the vehicle.

  • If you see that your key is dirty, cleaning it can also help. Cleaning the key itself is also very easy. Use a cotton swab and rubbing alcohol to remove any foreign material that may be stuck to the key. You can then attempt to start the car again.

  • Some resources recommend tapping the key with a hammer, or other object, while it is in the ignition, but it is not recommended due to the high risk of not only breaking the cylinder but also breaking the key. This can trap a piece of the key inside the cylinder, causing more damage.

Reason 3 of 3: Ignition lock cylinder issues

Also known as a key cylinder, this is another area that could be causing issues with a key turning over. Below are the two most common problems associated with the ignition lock cylinder and the key not turning.

Problem 1: Obstruction. An obstruction inside the key cylinder will not allow the key to turn the ignition properly. Look inside at the key cylinder with flashlight. You will want to look for any obvious obstruction. Occasionally when a key cylinder has completely failed you will see metal debris inside.

  • If attempting to clean the ignition lock cylinder, always begin with safety glasses to protect your eyes from any flying debris. To clean, use electrical cleaner or compressed air, and follow the precautions and instructions on cans. Make sure your area is well ventilated. You can try to re-spray if necessary. If debris was successfully removed, key should slide in easy.

tack hammer tapping ignition

Problem 2: Stuck springs. There can be problems due to the actual pins or springs inside the key cylinder. When this happens, using a small tack hammer, to gently tap the key ignition. This can help loosen any stuck pins or springs. You do not want to hit hard, but instead know that you are using the vibration of the tap, not the force, to help loosen any pins that may be jammed. Once they are free, you can attempt to insert the key and turn.

The methods listed above are great ways to get your key turning. However, if you are still struggling with key turn issues after all these tips, your best bet is to contact a mechanic for further diagnosing. YourMechanic provides certified mobile mechanics who come to your home or office and can easily diagnose why your key isn't turning and make the necessary repairs.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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