Replacing an ABS pump often requires coding the new module to the vehicle. However, sometimes the coding process fails, leaving you with a non-functional ABS system. This article explores a common issue where ABS coding is not available on VCDS (Vag-Com Diagnostic System) when replacing an ABS pump on a 2012 Audi A3 8P 2.0 TDI, and potential solutions.
Understanding the Problem: “Coding Rejected – Error 31”
After replacing the ABS pump on a 2012 Audi A3, attempts to code the new pump using VCDS resulted in a “Coding rejected – Error 31 – Request out of range” message. Both the workshop code (06314/123/12345) and the security code were tried without success. This error indicates that the coding attempted is not accepted by the ABS module. Below are the VCDS readings from the donor car, the original module, and the new module after installation.
Donor Car ABS Module:
Address 03: ABS Brakes (-----) Labels: 1K0-907-379-60EC1F.clb
Part No SW: 1K0 907 379 AE HW: 1K0 907 379 AE
Component: ESP MK60EC1 H35 0104
Revision: 00H35001 Coding: 13424012092200FDC81202E8902000823900
Shop #: WSC 06314 000 00000 VCID: 75E1DDA8DC42F5E9CA-8020Original ABS Module (Before Replacement):
Address 03: ABS Brakes (J104) Labels:. 1K0-907-379-60EC1F.clb
Part No SW: 1K0 907 379 BL HW: 1K0 907 379 BL
Component: ESP MK60EC1 H31 0152
Revision: 00H31001 Coding: 1342401249240002C80F02EC92210092390800
Shop #: WSC 06314 123 12345 VCID: 7DF1C588E472AD612A-8028New ABS Module (After Replacement):
Address 03: ABS Brakes (-----) Labels:. 1K0-907-379-60EC1F.clb
Part No SW: 1K0 907 379 AE HW: 1K0 907 379 AE
Component: ESP MK60EC1 H35 0104
Revision: 00H35001 Coding: 000000000000000000000000000000000000
Shop #: WSC 06314 000 00000 VCID: 75E1DDA8DC42F527EC-8020Possible Causes and Solutions
Several factors could contribute to this coding issue:
- Incompatible Hardware: While the part numbers for the hardware (HW) match between the donor and new modules, subtle differences in revisions or internal components might exist, creating incompatibility.
- Software Version Mismatch: The software (SW) versions of the donor car (AE) and the original module (BL) are different. This difference might require specific coding adaptations for the new module to function correctly.
- VCDS Software or Cable: Outdated or faulty VCDS software or a defective diagnostic cable can hinder communication with the ABS module and prevent coding. Updating to the latest VCDS version and ensuring cable integrity is crucial.
- Component Protection: Modern vehicles often employ component protection to prevent theft. This feature might require online coding or dealer-level tools to authorize the new ABS module.
- Incorrect Coding Procedure: While the workshop code was attempted, there might be specific steps or procedures required for coding this particular ABS module that were not followed. Consulting official repair manuals or seeking guidance from experienced technicians specializing in VAG vehicles is recommended.
Further Diagnosis
The provided VCDS scan reveals several other fault codes in various modules, many related to a low voltage condition (00446 – Function Limitation due to Under-Voltage). Addressing these underlying issues, particularly those related to the battery and power supply, is essential before further troubleshooting the ABS coding. A dead battery or electrical problems can significantly impact the coding process.
Conclusion
“Abs Coding Not Available On Vcds” errors can stem from various issues, from hardware and software incompatibilities to component protection and procedural errors. A systematic approach to diagnosis, starting with addressing basic electrical issues and ensuring proper software and hardware versions, is crucial. If basic troubleshooting steps fail, professional assistance from a specialized VAG technician or dealer is advisable. Correctly coding the ABS module is vital for the proper functioning of critical safety systems like ABS and ESP.
