The 2000–2006 Suburban uses the same key setup, so everything on this page applies to those years too. The full picture is on the Chevrolet Suburban key guide.

2003 Chevrolet Suburban: key facts

Key type: Mechanical (no chip)
Push-to-start: No
Transponder chip: none (Passlock — no chip in key)
Programming: NONE
All keys lost: We can originate new keys on site

Passlock: the security sensor lives in the ignition lock cylinder, not the key — a correctly cut key starts the vehicle with no programming. Security-light no-starts usually mean a failed Passlock sensor, and a 30-minute (3x10-minute) relearn is required after ignition-cylinder or BCM replacement.

Same key system as the 2000–2006 Suburban

Chevrolet kept the Suburban's key system unchanged across 2000–2006, so everything about replacing a 2003 key — blanks, programming, and what happens if every key is lost — matches the rest of that run. The full year-by-year breakdown lives in our Chevrolet Suburban key guide.

What drives the price is the key type, whether you still have a working key, and where the car is parked. There's more on Chevrolet programming in general on our Chevrolet key page.

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Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.

Last updated 2026-10-11.

2003 Chevrolet Suburban key replacement

2003 Chevrolet Suburban: key facts

Same key system as the 2000–2006 Suburban

We cover all these cities