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GM B120 / B121 Transponder Key 46 Circle+ 2008-2020
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GM B120/B121 transponder key for 2008-2020 GM vehicles. Features the 46 Circle+ chip — the same high-security transponder used across late-model GM vehicles. Aftermarket or OEM chip available. Uncut blade requires professional cutting and programming by a licensed locksmith or GM dealership. Ships from USA with wholesale pricing for locksmiths.
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🔧 Technical Specifications
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Chip 46 Circle+ (Aftermarket / OEM available)
Keyway Type B120 / B121
Compatible Brands Chevrolet, GMC, Buick, Cadillac, Saturn
Condition New | Aftermarket
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✅ Compatibility Checklist
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✅ Chevrolet Silverado (2008-2020)
✅ Chevrolet Tahoe (2008-2020)
✅ Chevrolet Suburban (2008-2020)
✅ GMC Sierra (2008-2020)
✅ GMC Yukon (2008-2020)
✅ Buick Enclave (2008-2017)
✅ Cadillac Escalade (2008-2020)
⚠️ IMPORTANT: Confirm chip type (aftermarket vs. OEM) and verify the B120/B121 keyway with your customer's vehicle before ordering. Some newer GM models may require OEM chip for programming compatibility.
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🔑 Programming Instructions
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1. This key requires professional programming — not self-programmable.
2. Take the key to a licensed locksmith or GM dealership.
3. Provide your vehicle's VIN and the B120/B121 keyway specification.
4. The technician will cut and program the key to your vehicle.
5. Test all functions after programming is complete.
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📦 What's Included
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• 1× GM B120/B121 Transponder Key (Aftermarket)
• 46 Circle+ Chip (Aftermarket or OEM — specify at order)
• 1× Key Blade (uncut — requires professional cutting)
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🚚 Shipping & Warranty
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✅ Free shipping on orders over $100
✅ Ships within 1–3 business days
✅ 1-Year Free Return Policy
✅ In Stock — Ready to Ship
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❓ Frequently Asked Questions (FAQ)
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Q1: How do I know if this key is compatible with my vehicle?
A: Check your existing key for the B120 or B121 keyway marking. This key is compatible with 2008-2020 GM vehicles including Chevrolet Silverado, Tahoe, Suburban, GMC Sierra, Yukon, Buick Enclave, and Cadillac Escalade. If unsure, provide your VIN and we can confirm compatibility.
Q2: What is the difference between B120 and B121 keyways?
A: The B120 and B121 are closely related GM keyways used across similar model years. Both use the 46 Circle+ chip. The specific keyway your vehicle requires depends on the model year and trim level. Always verify the keyway marking on the original key before ordering.
Q3: What is the 46 Circle+ chip?
A: The 46 Circle+ is GM's high-security fixed-code transponder chip used in many GM vehicles from the late 2000s onward. It is a reliable chip type that most locksmiths and GM dealerships can program without issues. Both aftermarket and OEM versions are available.
Q4: Do I need to program this key?
A: Yes. The B120/B121 transponder key requires professional programming by a licensed locksmith or GM dealership. It is not self-programmable. Bring the key along with your vehicle's VIN to a professional.
Q5: Do I need to cut the key blade?
A: Yes. The key blade comes uncut and must be cut to match your vehicle's ignition. Your locksmith or dealer will handle this during the programming appointment.
Q6: What is the difference between aftermarket chip and OEM chip?
A: The aftermarket chip is a professionally manufactured equivalent to the original GM chip, tested for reliable programming on most 2008-2020 GM vehicles. The OEM chip is a genuine GM replacement. Some 2015+ models may require the OEM chip for full programming compatibility. Confirm with your customer's vehicle before ordering.
Q7: What is your return policy?
A: We offer a 1-year free return policy. If the key is defective or incompatible (verified before programming), contact us for a replacement or refund.
Q8: How long does shipping take?
A: Ships within 1–3 business days. Free shipping on orders over $100. Delivery typically takes 3–7 business days within the US.
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🏷️ Certifications
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🔧 B120/B121 Keyway | 🔧 46 Circle+ Chip | 🔒 1-Year Warranty | ✅ Ships from USA
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📌 Related Products
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► GM B111 Transponder Key Chip 46 Circle+ | $3.50 | /products/1064
► GM HU100 High Security Key Shell | $5.00 | /products/107
► GM B99/B112 Key Shell | $5.00 | /products/105
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SKU: Chipkey-B120A | Keyway: B120/B121 | Chip: 46 Circle+
Compatible: Chevrolet, GMC, Buick, Cadillac, Saturn 2008-2020
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