Is there a way to off the pass-lock or anti theft system in 2003 Chevy Impala without taking it dealership?

No, there's no legitimate way to disable the passlock or anti-theft system in a 2003 Chevy Impala without the correct key and/or dealer intervention. Attempts to bypass these systems are often illegal and can damage your car's electronics. The system is designed to prevent theft, and bypassing it would defeat that purpose.

If you're locked out, your best options are:

* Contact a locksmith: A reputable locksmith specializing in automotive security may be able to help you regain access without damaging your vehicle. They have specialized tools and knowledge.

* Contact your insurance company: If your car is stolen and you have comprehensive coverage, your insurance company will handle the recovery and repair.

* Use a spare key: If you have a spare key, use that.

Attempting to bypass the system yourself using information found online is risky and could result in costly repairs. It's far better to seek professional assistance.