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Port COM1-4 & LPT Missing in Device Manager - Vag KKL, Sony PCG-7Y2L, Windows XP Issue

Noras14 17769 14
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  • #1 16917075
    Noras14
    Level 7  
    Posts: 7
    Rate: 3
    Hello, as in the subject I have the Vag kkl interface, car diagnostics and it only uses COM1, COM2, COM3, or COM4 ports and needs one of these ports to choose, but I can't because I don't have it in the device manager, I don't know if this laptop or windows fault. My equipment is Sony PCG-7Y2L with Windows XP installed.
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  • #2 16917104
    Ture11
    Level 39  
    Posts: 5406
    Help: 573
    Rate: 1116
    Show the screenshot from the device manager - the interface probably has no driver installed, after a correct installation a virtual COM port should appear.
  • #3 16924231
    Noras14
    Level 7  
    Posts: 7
    Rate: 3
    Sorry that so late but I didn't have the answer when here is a photo.
    Attachments:
    • Port COM1-4 & LPT Missing in Device Manager - Vag KKL, Sony PCG-7Y2L, Windows XP Issue IMG_20171230_143551.jpg (9.14 MB) You must be logged in to download this attachment.
  • #4 16924236
    Kasek21
    Level 43  
    Posts: 45513
    Help: 4962
    Rate: 3503
    After all, the ports are detected in the Manager.
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  • #5 16924244
    Kolobos
    IT specialist  
    Posts: 85152
    Help: 17159
    Rate: 10419
    It doesn't have to, Vag kkl connects to USB.

    The author probably does not quite know what he does.
  • #6 16924256
    Noras14
    Level 7  
    Posts: 7
    Rate: 3
    Vag kkl works only on ports com 1, com 2, com 3, com 4, and one of these I have to choose in the device manager otherwise I will not connect the interface with the car.
  • #7 16924259
    Kasek21
    Level 43  
    Posts: 45513
    Help: 4962
    Rate: 3503
    Then choose in the interface application.
  • #8 16924262
    Noras14
    Level 7  
    Posts: 7
    Rate: 3
    Now there are ports and before they were gone I don't know why.

    Added after 46 [minutes]:

    Yes, only now I have ports in the manager. But when I connect the Vag kkl cable I can't see it in the ports and in the USB serial converter an exclamation point pops up.
    Attachments:
    • Port COM1-4 & LPT Missing in Device Manager - Vag KKL, Sony PCG-7Y2L, Windows XP Issue 15146446332881105325598.jpg (7 MB) You must be logged in to download this attachment.
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  • #9 16924360
    Ture11
    Level 39  
    Posts: 5406
    Help: 573
    Rate: 1116
    Then see the properties of this exclamation mark - what error does the computer give ...
  • #10 16924361
    Kasek21
    Level 43  
    Posts: 45513
    Help: 4962
    Rate: 3503
    You must install the driver.

    And don't worry about these COM ports from Device Manager.
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  • #11 16924379
    Noras14
    Level 7  
    Posts: 7
    Rate: 3
    The manager can already see the ports.
    And I have drivers installed.
    Attachments:
    • Port COM1-4 & LPT Missing in Device Manager - Vag KKL, Sony PCG-7Y2L, Windows XP Issue 1514645366867-420012848.jpg (5.39 MB) You must be logged in to download this attachment.
  • #12 16924383
    Kasek21
    Level 43  
    Posts: 45513
    Help: 4962
    Rate: 3503
    This is not about ports on the computer because they are emulated anyway.

    Upload screen from the application to this interface - where you have settings.
  • #13 16924393
    Noras14
    Level 7  
    Posts: 7
    Rate: 3
    I chose each of the ports and after clicking the test error with the port
    I understand the interface must be connected to the car but the port should write ok because it was on a friend's laptop.
    Attachments:
    • Port COM1-4 & LPT Missing in Device Manager - Vag KKL, Sony PCG-7Y2L, Windows XP Issue 1514645479671-1747170298.jpg (4.71 MB) You must be logged in to download this attachment.
  • #14 16924420
    Kolobos
    IT specialist  
    Posts: 85152
    Help: 17159
    Rate: 10419
    You need to install the drivers for the converter, only then you will have a com port with vag, which you must select in the program.

    Enter the ID of this "USB Serial Converter" from the manager (PID and VID).
  • #15 16925013
    Noras14
    Level 7  
    Posts: 7
    Rate: 3
    The topic can be closed already everything works.
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Topic summary

✨ The discussion revolves around the issue of missing COM ports (COM1-4) in the Device Manager on a Sony PCG-7Y2L laptop running Windows XP, which is necessary for using the Vag KKL interface for car diagnostics. Initially, the user could not see the required COM ports, leading to confusion about whether the problem was with the laptop or the operating system. Responses suggested that the absence of ports might be due to missing drivers for the USB serial converter. After troubleshooting, the user confirmed that the ports were visible but encountered an exclamation mark on the USB serial converter when connecting the Vag KKL cable. Ultimately, the user resolved the issue by installing the necessary drivers, allowing the interface to function correctly.
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FAQ

TL;DR: If your VAG KKL USB cable won’t show usable ports, remember it targets 4 legacy COM ports and “works only on ports com 1, com 2, com 3, com 4.” Fix by installing its USB‑serial driver so a virtual COM appears. [Elektroda, Noras14, post #16924256]

Why it matters: This FAQ helps Windows XP users quickly restore COM1–COM4 access for VAG KKL diagnostics on laptops without native serial ports.

Quick Facts

How do I fix “COM1–COM4 missing” for a VAG KKL USB cable on Windows XP?

Install the USB‑to‑serial converter driver for the VAG KKL cable. After installation, a virtual COM port appears in Device Manager. Open your diagnostics app and select that COM port. If ports were invisible earlier, reinstalling or properly loading the converter driver is the key step. As one expert put it, “only then you will have a com port with vag,” and the user later confirmed the fix. [Elektroda, Kolobos, post #16924420]

What does the yellow exclamation on “USB Serial Converter” mean?

It indicates a driver error. Until the correct driver loads, Windows XP cannot create the virtual COM port the app needs. In the thread, the user saw an exclamation on “USB Serial Converter,” and no working COM was available for testing. Clear it by installing the proper driver for your cable’s USB‑serial chipset. [Elektroda, Noras14, post #16924262]

Do I need a physical COM port, or is USB enough?

USB is enough. VAG KKL connects via USB and relies on a driver to emulate a serial (COM) port. A built‑in RS‑232 connector is unnecessary on your laptop. After driver setup, select the created COM in your diagnostic software. [Elektroda, Kolobos, post #16924244]

Where do I select the correct COM port—Device Manager or the app?

Select it inside your diagnostics application. Device Manager just shows the port’s presence; the app must be told which COM to use. Open the app’s interface settings and choose the listed virtual COM that the driver created. [Elektroda, Kasek21, post #16924259]

What is a virtual COM port?

A virtual COM port is a software‑emulated serial port created by the USB‑to‑serial driver. When installed, it appears in Device Manager and can be chosen in apps that expect COM1–COM4. Without this driver, the app cannot talk to the cable. [Elektroda, Ture11, post #16917104]

How do I identify the right driver for my VAG KKL cable?

Read the device’s VID and PID from Device Manager and match them to the correct USB‑serial driver package. The helper in the thread explicitly asked for VID/PID to guide driver choice. Install that driver and recheck for a new COM port. [Elektroda, Kolobos, post #16924420]

My app’s port test fails on every COM. What next?

Port tests fail when the virtual COM is missing or mis‑matched. First, install the converter driver so the VAG KKL exposes a COM port. Then, pick that exact COM in the app and retest. “Only then you will have a com port with vag,” as the expert noted. [Elektroda, Kolobos, post #16924420]

Why did COM and LPT ports appear later after being missing at first?

Windows can refresh the device list after changes, reinstalls, or reboots. In the case reported, ports were initially missing but later appeared, aligning with driver or detection changes. After that, the user focused on fixing the USB converter driver. [Elektroda, Noras14, post #16924262]

What should I check in Device Manager when I see an error?

Open the device’s Properties and read the error details for the faulty USB converter. Note the VID/PID and the exact error code. Use that information to locate and install the correct driver for the cable. Then the virtual COM should appear. [Elektroda, Ture11, post #16924360]

Is the issue confirmed solved in this thread?

Yes. The original poster reported that everything works after following guidance and the topic was closed as resolved. This validates the driver‑and‑select‑COM approach for the VAG KKL on Windows XP. [Elektroda, Noras14, post #16925013]

Does VAG KKL strictly require COM1–COM4?

The user’s software required choosing from COM1 to COM4, which is common for older diagnostic tools. Ensure the driver assigns or the app accepts one of those four ports for reliable communication. That numeric limitation drove the troubleshooting here. [Elektroda, Noras14, post #16924256]

Three-step quick fix: how do I get the port working?

  1. In Device Manager, note the USB “Serial Converter” VID/PID and any error.
  2. Install the matching USB‑serial converter driver for your VAG KKL.
  3. Open your diagnostics app and select the newly created COM port. [Elektroda, Kolobos, post #16924420]

Edge case: drivers installed but no COM appears—what can cause this?

A lingering Device Manager error blocks COM creation. Check Properties to see the error and confirm the VID/PID. Reinstall the correct driver, then verify the app selects the created COM. If the error persists, the cable or USB port may be faulty. [Elektroda, Ture11, post #16924360]

What did the expert say about creating the COM port?

“You need to install the drivers for the converter, only then you will have a com port with vag.” Follow that, then choose the port in your app. [Elektroda, Kolobos, post #16924420]

Can I ignore Device Manager COM entries and just configure the app?

You still need the driver so the virtual COM exists. After that, concentrate on the app’s interface settings to choose the correct COM. Without the driver, the app cannot connect. [Elektroda, Kasek21, post #16924361]
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