How do you reset the engine immobilizer in a 2001 Chevy Malibu?

You don't "reset" an engine immobilizer in the way you might reset a trip odometer. The immobilizer system is tied to your car's computer and the transponder chip in your car key. If your 2001 Chevy Malibu's immobilizer is activated (meaning the car won't start), the problem is almost certainly one of the following:

* Faulty Key: The most common cause. The battery in your key fob might be dead, or the transponder chip itself might be malfunctioning. Try a spare key if you have one. If that works, you'll need a new key made (and programmed).

* Weak Battery: A weak car battery can sometimes prevent the immobilizer from communicating correctly. Try jump-starting your car. If it starts, you likely need a new battery.

* Immobilizer System Malfunction: Less common, but possible. A problem with the car's computer or the immobilizer system itself could be the culprit. This usually requires a professional diagnosis and repair at a dealership or qualified mechanic. They'll likely need to use a scan tool to check for error codes.

* Incorrect Key Programming: While less likely on a 2001 model, if you've recently had keys duplicated or reprogrammed, there might be an issue with the programming itself. Again, a professional will be needed.

In short: there's no DIY "reset" button or procedure. Trying to bypass the immobilizer system is generally not recommended and could be harmful to your vehicle. Focus on troubleshooting the key and battery first. If neither solves the problem, seek professional help.