VCDS Audi A3 2011: ABS Module Coding Issue

Replacing a faulty ABS module in a 2011 Audi A3 can be more complex than just swapping the hardware. This article addresses a common issue encountered when installing a used ABS module: coding incompatibility. We’ll explore the problem, potential solutions, and provide insights using VCDS (VAG-COM Diagnostic System) scan data.

Understanding the Problem

The original ABS module (1K0 907 379 BG) in a 2011 Audi A3 2.0T Quattro (8P chassis) malfunctioned, triggering various dashboard warning lights. A replacement used module (1K0 907 379 AP) was sourced. However, direct coding transfer from the old to the new module using VCDS resulted in a “Coding rejected Error 12: Sub-function not supported or invalid format.” This error indicates a coding mismatch between the two modules, despite both being MK60EC1 units and having seemingly identical coding lengths.

Original Module (1K0 907 379 BG):

• Coding: 1150600F492A00FB880E06E792220041BF0C00
• Component: ESP MK60EC1 H31 0106
• Option: UG4 (Hill Hold Assist)

Replacement Module (1K0 907 379 AP):

• Coding: 00000000000000000000000000000000000000
• Component: ESP MK60EC1 H45 0107
• Option: UG4 (Hill Hold Assist)

The replacement module’s all-zero coding suggests it’s either in a virgin state or has been improperly reset.

VCDS Scan Data Analysis

Pre-replacement Auto-Scan (Partial):

Address 03: ABS Brakes (J104)
Part No SW: 1K0 907 379 BG
Component: ESP MK60EC1 H31 0106
Coding: 1150600F492A00FB880E06E792220041BF0C00
No fault code found.

Post-replacement Scan (Partial):

Address 03: ABS Brakes
Part No: 1K0 907 379 AP
Component: ESP MK60EC1 H45 0107
Coding: 00000000000000000000000000000000000000
Faults Found:
01042 - Control Module; Not Coded
... other faults related to sensor basic settings

The post-replacement scan confirms the “Not Coded” status (fault code 01042) and reveals additional faults related to uncalibrated sensors. These sensor errors are likely a direct consequence of the missing ABS module coding.

Possible Solutions

1. Long Coding Helper: Within VCDS, utilize the Long Coding Helper for module 03 – ABS Brakes. This function attempts to decode the long coding string, allowing modification of individual parameters based on the vehicle’s equipment. Carefully compare the decoded parameters of the original and replacement modules, adjusting the new module’s coding accordingly.

2. Manual Coding Calculation: Refer to the factory repair manual or online resources specifically for the Audi A3 8P chassis. These resources may provide detailed information on how to calculate the correct long coding based on the vehicle’s PR codes (option codes). The provided PR code list can be crucial for this process.

3. Dealer or Specialist Coding: If the above options fail, consult an Audi dealer or a specialized VAG-COM technician. They have access to proprietary tools and databases that can provide the correct coding for the replacement module. They may also be able to perform online coding or component protection removal if necessary.

Conclusion

Successfully coding a replacement ABS module in a 2011 Audi A3 requires careful attention to detail and a thorough understanding of the vehicle’s specific equipment. Using VCDS in conjunction with the Long Coding Helper or referencing factory documentation can potentially resolve the issue. However, if challenges persist, professional assistance from a dealer or specialist is recommended. Proper coding is essential not only for clearing fault codes but also for ensuring the ABS system functions correctly and safely.