Reinstall the specific VCDS version that came with your cable.
This is the #1 solution for 90% of users.
It seems you're encountering an issue related to VCDS (VAG-COM Diagnostic System) Loader, specifically with a "Kolimer failed" error, denoted as error 2. VCDS is a popular tool used for diagnostics and coding of Volkswagen Group vehicles (VW, Audi, Seat, Skoda). The error you're experiencing suggests a problem during the loading or initialization process of the VCDS software. Let's break down the information and potential solutions:
To help you get past the "Failed 2" error, could you tell me:
Which (e.g., Windows 10, Windows 11) are you running? vcds loader kolimer failed 2
[Diagnostics Cable] ---> [USB Port] ---> [VCDSloader.exe (Bypasses Licensing Check)] ---> [VCDS.exe Main Application]
Because the loader alters how software executes, antivirus programs treat it as a threat.
: Security software often flags VCDS loaders as "false positives" because of their patching behavior. Before running the loader, disable your antivirus
What of VCDS (e.g., 20.4, 23.3, 25.x) you are attempting to run? Reinstall the specific VCDS version that came with
Set your fuses correctly to prevent the chip from locking up. Typical clone fuse settings: : 0xCD High Fuse : 0x19 Extended Fuse : 0xFC
Resolving this error requires understanding how the loader interacts with your PC's security settings, device drivers, and the integrated ATmega162 chip inside the cable assembly. 1. What Causes the "Failed 2" Error?
Unlike "Failed 1" (which usually means the loader cannot find the VCDS executable), is more insidious. It indicates a communication or permission breakdown between the loader, the operating system, and the VCDS software.
: Discuss the DIY car culture. For many, the high cost of official tools leads them to community-developed workarounds. The "Failed 2" error is a symbol of the "cat-and-mouse" game between official software updates and community patches. VCDS is a popular tool used for diagnostics
Replace the existing VCDSLoader.exe in your VCDS installation folder. 2. Configure Antivirus Exclusions
To fix a bricked Atmega162-based clone cable, you will need to perform a hardware flash. This requires a digital programmer tool (such as a USBasp or an EEPROM programmer) and a software utility like MPlab or AVRDUDE. You will have to open the plastic housing of the VCDS cable, solder temporary jumper wires to the chip's programming pins, and manually re-flash the correct Kolimer-compatible EEPROM and flash firmware binaries.
: Windows may have automatically updated the USB drivers to an official Ross-Tech version that is incompatible with the loader's requirements.
“Failed 2” is not a bug in the loader – it’s a sign that the cat‑and‑mouse game between Ross‑Tech and the clone scene has moved on. Kolimer’s loader worked beautifully for VCDS versions up to ~2021. For anything newer, you’ll spend more time wrestling with “Failed 2” than diagnosing a car. Either freeze your software stack in time, or invest in the genuine tool.
In short: the loader tried to trick VCDS into thinking an authentic Ross‑Tech interface was present, and something stopped it at the last moment.