2022-2024 Audi A3/S3/RS3 Magnetic Field Too Low ABS DTC

Symptoms

Owners of 2022-2024 Audi A3, S3, and RS3 vehicles may notice various warning messages appearing in the instrument cluster. These can include "Multiple messages/Pre sense fault message" warnings.

Fault Codes / DTCs

During diagnosis, technicians may find specific Diagnostic Trouble Codes (DTCs) stored in the vehicle's control units:

Code	Description	Control Unit (Address Word)
C101AF1	"magnetic field too low"	ABS control unit J104 (0003)
C101BF1	"magnetic field too low"	ABS control unit J104 (0003)
C101CF1	"magnetic field too low"	ABS control unit J104 (0003)
C101DF1	"magnetic field too low"	ABS control unit J104 (0003)
U112300	"Databus error value received; Databus implausible message"	Distance Regulation control unit J428 (0013)
U112200	"Databus error value received; Databus implausible message"	Distance Regulation control unit J428 (0013)

Important Warnings

Audi has issued critical advisories regarding this issue:

• Do not replace speed sensors! Parts replacement will not resolve the underlying software issue. Any claims for replaced parts will be subject to review by Audi Warranty.
• Before any repair, ensure that the speed sensors are clean and free of any debris, oil residues, grease, or dirt.

Diagnosis and Production Solution

This condition is primarily due to an issue with the software in the ABS control unit. Audi implemented an improved software solution in production vehicles starting in April 2024. For vehicles produced before this date, a software update is required.

Repair Procedure Summary

Technical Service Bulletin (TSB) 2072549/2 outlines the procedure to correct the "Audi A3 S3 RS3 magnetic field too low" issue. The repair involves updating the software of the ABS control unit J104 using specific Software Version Management (SVM) action codes. The exact steps vary slightly depending on the hardware version of the ABS control unit.

For Vehicles with Hardware Version 13 in ABS Control Unit J104

1. Check the current software version of the brake control unit. If it is lower than version 133, run SVM Codes 03A033A followed by 03A033B. These updates will bring the ABS control unit J104 to software version 134.
2. After the initial update, run SVM Code 03A037.
3. If the vehicle is already equipped with software version 133 or 134, only run SVM Code 03A037.
4. Proceed with parking brake basic settings.

For Vehicles with All Other Hardware Versions in ABS Control Unit J104

1. Delete all stored DTCs in both the ABS control unit J104 (address word 0003) and the Distance Regulation control unit J428 (address word 0013).
2. Perform a short road test.
3. No additional work is necessary, and the DTCs should not return.

Required Software and Part Numbers

To perform the software update, technicians will use the following software part numbers and versions:

Model	Old Software Part Number	Old Software Version	New Software Part Number	New Software Version	SVM Code Input
A3	5WA614517N	0125, 0127, 0129, 0130, 0131, 0132	5WA614517N	0134	03A033A
A3	5WA614517P	0125, 0127, 0129, 0130, 0131, 0132	5WA614517P	0134	03A033A
A3	5WA614517N	0134	5WA614517P	0134	03A033B
A3	5WA614517P	0134	5WA614517P	0134	03A033B
A3	5WA614517N	0133, 0134, 0135	5WA614517N	0136	03A037

Warranty Information

This service is covered under Audi's standard warranty, typically up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, coverage is under G10. If your vehicle is outside of any warranty, this Technical Service Bulletin 2072549/2 serves as informational guidance. Warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

NHTSA ID: 11002227