Toyota Key Differences: Dot Key, G-Key, H-key

If you’re installing a Start-X remote, you may hear about Dot keys, G-keys, or H-keys. Here’s a simple breakdown of what that means, and why it matters.

What are the Dot, G, and H keys?

Toyota vehicles use different types of keys, often referred to as:

• Dot key – marked with a small black dot (older vehicles)
• G-key – marked with a “G” (mid-year models)
• H-key – marked with an “H” (newer models)

These markings relate to the chip type and the key's security level.

Does my key type affect Start-X compatibility?

Yes, but not in the way most people think. What really matters is whether your vehicle has an immobilizer system, not just the letter on your key.

Does a “G” or “H” key mean my car has an immobilizer?

No, it does not. Even if your key is marked with a G or H, your vehicle may or may not be equipped with an immobilizer.

Why does the key marking not always correspond to the vehicle?

There are a few reasons:

• Toyota uses the same key shapes across different vehicles.
• Some models were offered with or without immobilizers.
• Replacement keys may have markings that don’t match the internal chip.

These are the reasons the letter on the key can be misleading.

How do I know if my vehicle has an immobilizer?

There are a couple of ways to check:

• Some vehicles will show a flashing security light on the dashboard when the car is off.
• Wrap foil around the base of the key, and try starting the vehicle. If the vehicle doesn't start, it has an immobilizer.

Why does the immobilizer matter for remote start?

If the vehicle has an immobilizer:

• A bypass system may be required.
• Installation may be slightly different.

Can I send tech support a picture of my key?

Yes, a photo can help, but keep in mind:

• The marking on the key by itself is not enough to confirm compatibility.
• We may still need your vehicle details to be 100% accurate.

What’s the most reliable way to check compatibility?

If all other options have been exhausted, please provide us with the year, make, and model of your vehicle so that we may conduct a further investigation.

Pictures of the different Toyota keys:

Search Keywords: immobilizer, g-key, dot-key, h-key, will this work, toyota programming,