* Faulty Ignition Switch: This is a common failure point in older vehicles. The switch itself might be worn out or failing to properly make contact.
* Worn or Damaged Ignition Key: The key's transponder chip might be damaged or no longer communicating with the vehicle's system.
* Low Battery: A weak battery can sometimes prevent the PATS system from functioning correctly. Try jump-starting the car.
* Problem with the PATS System Itself: This is less common but possible. A malfunctioning PATS module can prevent the car from starting, even with the correct key.
* Security System Issues (if equipped): If your Malibu has an aftermarket alarm or security system, that might be interfering.
What to do:
1. Try a spare key: If you have a second key, try that first. If it works, your original key is likely the problem. You'll need a replacement key from a locksmith or dealership, programmed specifically for your vehicle's PATS system.
2. Check the Battery: Make sure the battery has sufficient voltage. Jump-starting might be enough to get it running. If the battery is weak, consider replacing it.
3. Inspect the Ignition Switch: You can try wiggling the key in the ignition while trying to start the car – but *do this gently*. If the problem is a faulty ignition switch, you'll likely need to replace it (a professional mechanic will be needed).
4. Have it professionally diagnosed: The most reliable approach is to take your Malibu to a qualified mechanic or a dealership. They have the tools and expertise to diagnose the problem properly (whether it's the ignition switch, the PATS system, or something else entirely). They can also replace parts as needed.
There's no "reset button" for the PATS system in a 1999 Chevy Malibu. Any claims of a simple reset are misleading. The solutions require addressing the underlying cause of the starting problem.
