1. Check the Obvious:
* Key Fob Batteries: Dead batteries in your key fob can prevent the car from recognizing the key. Try replacing the battery in your key fob. If you have multiple fobs, try each one.
* Key Position: Make sure the key is fully inserted into the ignition and that it's not stuck or obstructed in any way. Try gently jiggling it.
* Steering Wheel: Ensure the steering wheel isn't locked. Gently try to wiggle the wheel while turning the key.
2. Passive Anti-Theft System (PATS) Issues:
The 2001 Malibu likely uses a Passive Anti-Theft System (PATS). This system uses a transponder chip in your key to communicate with the car's computer. If there's a problem with this communication, the car won't start.
* Key Programming: The key's transponder might be malfunctioning or not properly programmed to your car's computer. This is the most likely cause. You'll likely need a locksmith or a dealership to reprogram or replace the key.
* Vehicle Computer Issues: Less common, but possible, is a problem with the car's computer itself. This could be a faulty component or a software glitch. This requires diagnostic tools and potentially repair by a mechanic.
* Immobilizer System: There's a chance the immobilizer system itself is malfunctioning. A mechanic with diagnostic equipment can check this.
3. Other Potential Issues (Less Likely):
* Battery: While less likely if the anti-theft light is flashing, a weak battery can sometimes trigger the anti-theft system. Check the battery voltage. If it's low, jump-start the car. (Only jump-start using correct procedures to avoid damaging the car's electrical system.)
* Alternator: A failing alternator might be causing voltage problems which manifest as anti-theft issues.
4. What to Do:
* Try All Keys: If you have spare keys, try each one to see if one works.
* Call a Locksmith: Locksmiths are experienced in dealing with PATS systems and can often reprogram keys or diagnose the problem more quickly than a dealership.
* Dealer or Mechanic: If the locksmith can't resolve the issue, you may need to take the car to a qualified mechanic or a Chevrolet dealership for diagnosis and repair. They have the proper diagnostic tools to check the car's computer and PATS system.
Important Note: Avoid repeatedly trying to start the car. Too many attempts might further damage the car's electrical system or lock the system down even more.
It's highly probable that the problem lies with the key's transponder and its interaction with the vehicle's PATS system. Calling a locksmith is generally the most efficient first step in resolving this situation.
