Why Won't My Car Start? Key, Ignition and Mechanical Clues
A no-start condition can come from the key and immobilizer, the ignition lock, the battery, the starter or an engine problem. The symptoms help determine whether to call a locksmith, mechanic or roadside service.
The key will not turn
Do not force the blade. Try a spare key if one is available and make sure the steering wheel is not holding pressure against the lock. A worn key or damaged ignition cylinder may need locksmith inspection.
A security light is flashing
An immobilizer warning or “key not detected” message may indicate a transponder, fob battery or programming problem. Test another programmed key if possible. Vehicle-specific diagnosis is needed before replacing a fob.
The engine does not crank
Dim lights, clicking or complete electrical loss often points to the battery, connections or starter rather than the lock cylinder. Roadside assistance or a mechanic is normally the better first call.
The engine cranks but does not run
Fuel, ignition, engine-control and mechanical faults are outside normal locksmith work. Avoid repeated starting attempts if there are warning lights, unusual sounds, smoke or a fuel smell.
For a key that sticks or will not turn, see ignition lock service. For a key-recognition problem, see vehicle key programming.