For example, are you experiencing issues with:
* The security system? If your car won't start due to a security issue, you might need to reprogram the key fob or have the system checked by a locksmith or dealer. There isn't a simple "bypass" module you can reset.
* The fuel pump? A faulty fuel pump wouldn't involve a bypass module. This would require diagnostics to identify the problem.
* The emissions system? Again, no bypass module exists for normal operation. A check engine light would indicate a problem requiring diagnostics.
* An aftermarket alarm system? If you have an aftermarket security system installed, its bypass procedure will depend entirely on the specific make and model of that system. The instructions should be with the system's documentation.
To get helpful advice, please describe the problem you're having with your 2000 Impala. Be as specific as possible about the symptoms.