Car Engine Not Turning

Causes

Check the battery voltage. A dead battery will not be able to provide enough power to turn the starter motor.
Listen for a clicking sound when you turn the key. If you hear a clicking sound, it is likely that the starter motor is bad.
Check the ignition switch. A faulty ignition switch will not be able to send power to the starter motor.
Inspect the wiring for any loose or damaged connections. A loose or damaged wire could be preventing power from getting to the starter motor.
Check the fuel pump. A faulty fuel pump will not be able to deliver fuel to the engine, which will prevent it from starting.
If you have checked all of the above and the engine still does not turn, there may be an engine mechanical issue. This will require further diagnosis by a qualified mechanic.

The repair for a car engine not turning will depend on the underlying cause.

If the battery is dead, it will need to be replaced.
If the starter motor is bad, it will need to be replaced.
If the ignition switch is faulty, it will need to be replaced.
If the wiring is loose or damaged, it will need to be repaired.
If the fuel pump has failed, it will need to be replaced.
If there is an engine mechanical issue, it will need to be repaired by a qualified mechanic.

There are a few things you can do to help prevent your car engine from not turning:

Keep your battery in good condition. A well-maintained battery will last longer and be less likely to fail.
Get your starter motor checked regularly. A qualified mechanic can check the starter motor for any signs of wear or damage.
Inspect the wiring for any loose or damaged connections. Loose or damaged wires can cause electrical problems that could prevent the engine from starting.
Get your fuel pump checked regularly. A faulty fuel pump can prevent the engine from getting fuel, which will prevent it from starting.

By following these tips, you can help prevent your car engine from not turning and keep your car running smoothly.