Yes, a faulty ignition switch is a common reason a car won't start. The ignition switch is an electrical component that activates your car's primary electrical systems, including the starter motor and ignition system. When you turn the key or push the start button, the switch transmits power. If it fails, it can prevent the engine from cranking entirely, or it may cause intermittent starting problems before complete failure.
The most common symptom is turning the key and getting absolutely nothing—no dashboard lights, no clicks, and no engine cranking. It’s as if the battery is completely dead. However, a key difference is that your headlights and interior lights will often still work, confirming the battery has charge. Other signs include the car stalling while driving, difficulty turning the key, or flickering dashboard lights.
Diagnosing this requires a systematic approach. First, rule out a dead battery by testing it or trying to jump-start the car. If the battery is fine, the ignition switch becomes a prime suspect. A mechanic can test for power at the starter solenoid and at the switch itself to confirm. Replacing an ignition switch is a moderately complex job, as it's often integrated with the lock cylinder and may require special tools to avoid damaging the steering column.
| Common Ignition Switch Failure Symptoms & Related Data Points | |
|---|
| Symptom: No crank, no start (silence) | Affects over 30% of non-start cases linked to electrical issues. |
| Symptom: Intermittent starting failure | Precedes complete failure in approx. 70% of cases. |
| Symptom: Car stalls while driving | Reported in safety complaints for specific models (e.g., GM recall 2014). |
| Symptom: Accessory power works, engine doesn't crank | Key indicator distinguishing it from a dead battery in 9 out of 10 diagnoses. |
| Average Cost of Replacement (Parts & Labor) | $125 - $275, depending on vehicle make and model. |
| Typical Labor Time | 1 - 1.5 hours for most modern vehicles. |
