How to Solve Xhorse Key Tool Plus VW MQB49 5C CLK Line not Connected

February 21, 2026 uobdii Car Key Programmer 0

Customer problem:

I wanted to use Xhorse VVDI Key Tool Plus to add a 2023 VW MQB49 5C key, but it failed to read the original key data. The error message showed: “CLK line not connected.”

All soldering was correct. The same issue occurred with solder‑free adapter. What’s wrong?

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Solution:

1.Check wire connections carefully – don’t rely only on wire colors. Match the labels on the wires.

2.Focus on the CLK connection.

The CLK signal corresponds to Pin 24 of the chip.

key-tool-plus-vw-mqb49-5c-clk-line-not-connected-2

3.Inspect and repair the chip connection:

  • Use a microscope to examine the chip.
  • Polish any cracked or damaged pin.

key-tool-plus-vw-mqb49-5c-clk-line-not-connected-3 key-tool-plus-vw-mqb49-5c-clk-line-not-connected-4

4.Ensure a secure CLK connection:

  • Reattach the wire properly, or
  • If using a 5C/5D solder‑free adapter, press a needle firmly onto the CLK pin to hold it in place during the process.

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Once the CLK connection is secured, Xhorse Key Tool Plus will be able to read the original key data.

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