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To change the Chevrolet immobilizer, you typically need to replace the immobilizer unit, which is often integrated with the vehicle's engine control module (ECM). Begin by disconnecting the vehicle's battery, then remove the necessary panels to access the immobilizer. Follow your vehicle's service manual for specific disassembly instructions, and once replaced, you'll need to reprogram the new unit to sync with your keys using specialized diagnostic tools. Always consult a professional if you're unsure about the process.

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