Replacing an ABS module in a Mk6 Jetta GLI can be a complex process, often requiring VCDS (Vag-Com Diagnostic System) coding. This article discusses a common issue encountered when replacing the ABS module with a slightly different part number and provides insights into troubleshooting with VCDS.
Understanding the Problem: Incorrect Long Coding
The original ABS module (part number 1K0 907 379 BM) failed and was replaced with a newer revision (1K0 907 379 BK). Attempting to input the original module’s long coding string (A14B600C492800FD850C06E992220041A1180022) into the new module proved unsuccessful. After inadvertently truncating the code (A14B600C492800FD850C06E992220041A11800), the new module accepted it. However, this resulted in an incorrectly programmed module, causing further complications.
Analyzing the VCDS Scan Before Module Failure
A pre-failure VCDS scan reveals crucial information:
- Address 03: ABS Brakes (J104) shows a fault code: 16352 – Control Module – Electrical Error 014 – Defective. This confirms the original module’s failure. The fault frequency and mileage provide context to the issue.
- The scan also highlights the original module’s part number, software version, hardware version, and, most importantly, the original long coding. This data is essential for proper module replacement and coding.
- Other fault codes in different modules (e.g., Engine, Airbags, Telematics) may be unrelated to the ABS issue but should be addressed separately.
Troubleshooting with VCDS and Potential Solutions
The truncated long coding accepted by the new module indicates a potential incompatibility between the original and replacement part numbers. While both are for a Mk6 Jetta GLI, subtle differences in hardware or software revisions can affect coding compatibility.
Possible solutions using VCDS:
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Verify Coding Compatibility: Consult official resources like VW service manuals or reputable online forums (such as Ross-Tech’s VCDS forum) to confirm the correct long coding for the specific replacement module (1K0 907 379 BK). The coding may differ due to the updated part number.
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Manual Coding: If the correct coding is found, attempt to manually input it using VCDS. Ensure accurate entry and proper formatting.
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Coding Adaptation: Explore the adaptation channels within the ABS module using VCDS. Some adaptations might need adjustments to account for the new hardware. Consult the module’s documentation for specific adaptation channel meanings and recommended values.
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Module Reset: Try performing a module reset using VCDS. This can sometimes clear erroneous settings and allow for proper coding.
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Software Update: Check for available software updates for the new ABS module using VCDS. An updated software version might address coding compatibility issues.
Conclusion: Seeking Professional Help
If the above troubleshooting steps fail to resolve the issue, professional assistance may be required. A VW dealership or a specialized VAG (Volkswagen Audi Group) repair shop possesses the expertise, tools, and access to official resources necessary to diagnose and rectify complex coding problems. Incorrectly coded ABS modules can affect critical safety systems; therefore, professional intervention is recommended when DIY solutions are exhausted.
