Simple (and relatively inexpensive to check):
* Dead Battery: This is the most common cause. Have the battery tested at an auto parts store. They can usually do this for free. A weak battery might have cranked the engine before, but failed completely when under load.
* Loose or Corroded Battery Cables: Check the terminals on the battery for corrosion (white or green buildup). Clean them with a wire brush and baking soda solution if necessary. Also, ensure the cables are securely fastened.
* Fuel Pump Relay or Fuse: A faulty relay or blown fuse can prevent the fuel pump from working. Check your owner's manual to locate these and test them.
* Cranking Issues (Starter Motor): If the engine doesn't even attempt to turn over, the starter motor might be the problem. A mechanic will need to test this.
More Complex (and potentially more expensive):
* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer where the crankshaft is positioned. A faulty sensor can prevent the engine from starting.
* Cam Position Sensor (CMP): Similar to the CKP, a bad CMP sensor prevents proper engine timing.
* Ignition System Problems: Issues with the ignition coil, ignition module, or distributor (if equipped) can prevent spark.
* Fuel Pump Failure: The fuel pump itself could have failed. This is more likely if you hear no whirring sound from the fuel pump when you turn the ignition key (some pumps are audible).
* Computer Issues (PCM): While less common, a problem with the engine control module (PCM) can cause the engine to die unexpectedly.
What to do:
1. Start with the simple checks: Battery, cables, fuses, and relays.
2. Listen carefully when you try to start: Do you hear any unusual sounds (clicking, whirring, etc.)? This can provide clues.
3. Check your owner's manual: It will show you the location of fuses and relays.
4. Have it professionally diagnosed: If the simple checks don't reveal the problem, take your Aveo to a trusted mechanic for a proper diagnosis. Describing the exact circumstances of the failure (e.g., "it just died while driving at 30 mph") will be helpful.
Don't attempt repairs beyond your skill level. Working on a car's electrical system can be dangerous if you're not familiar with it.
