* Dead Battery: This is the most common cause. Have the battery tested at an auto parts store. A low charge or a bad battery will prevent the starter from engaging.
* Bad Starter: The starter motor may be failing. It's responsible for cranking the engine. A clicking sound when you turn the key is often a sign of a bad starter or a bad connection to the starter.
* Alternator Issues: While the alternator charges the battery, a failing alternator might not be putting out enough charge, leaving the battery too weak to start.
* Ignition Switch Problems: The ignition switch itself might be faulty. It's responsible for sending power to the starter and other systems when the key is turned. This is less common but possible.
* Security System Problems: If your Alero has a factory or aftermarket security system, it could be preventing the car from starting. Check for any warning lights or unusual behavior.
* Wiring Problems: Corroded or damaged wiring, especially around the battery and starter, can interrupt the electrical circuit needed to start the car.
* Neutral Safety Switch (Automatic Transmission): If you have an automatic transmission, the neutral safety switch prevents starting unless the gear selector is in Park or Neutral. Make sure the gear selector is in the correct position.
* Low Fuel: While unlikely if the key turns, ensure you have enough fuel.
Troubleshooting Steps:
1. Check the Battery: Test the battery voltage with a multimeter (or have it tested at an auto parts store). Low voltage is a clear indicator of a battery problem.
2. Listen for Clicking: When you turn the key, do you hear a clicking sound? One click might mean a bad starter, multiple clicks might indicate a low battery.
3. Check the Lights: Are the headlights and interior lights bright? Dim lights often suggest a bad battery or alternator.
4. Jump Start: Try jump-starting the car with jumper cables and a good battery. If it starts, the problem is likely with your battery or alternator.
5. Check Fuses and Relays: Inspect fuses and relays related to the starting system in the fuse box (usually under the hood or under the dashboard).
If you're not comfortable performing these checks yourself, take the car to a mechanic or auto repair shop for diagnosis and repair. They have the tools and expertise to pinpoint the exact problem.
