2023-2026 Audi Door Lock Fault TSB: DTC B122D29, B14FF29

Audi has issued Technical Service Bulletin (TSB) 2063236/7 to address various complaints related to front and rear door locks in several 2023-2026 Audi models. This TSB, dated September 26, 2024, supersedes previous bulletin Group 57 number 24-58 from August 30, 2024. The bulletin provides detailed diagnostic and repair information for issues where doors may not open correctly or trigger specific Diagnostic Trouble Codes (DTCs).

This TSB is particularly relevant for owners experiencing an Audi e-tron door lock fault or similar issues across the affected model range. It outlines the symptoms, associated fault codes, and the recommended service procedure to resolve these concerns.

Symptoms

Owners of affected Audi vehicles may observe the following symptoms related to a door lock malfunction:

• The front or rear door, on either the left or right side, cannot be opened from the outside or the inside.
• Warning messages may appear on the instrument cluster, such as those related to the "exit warning system" or "central locking" for the front or rear door.
• The vehicle may appear to be locked, but it is still possible to open a door without using a key.

Workshop technicians have also noted that door locks may simply not work, and various images indicate a problem with the door lock mechanism.

Fault Codes / DTCs

When diagnosing an Audi e-tron door lock fault or similar issues, one or more of the following Diagnostic Trouble Codes (DTCs) may be logged in the vehicle's event memory:

Code	Description	Module
B122D29	Lock unit for central locking Implausible signal	Door Control Unit
B122B13	Central locking motors Open circuit	Door Control Unit
B14FF29	Child safety lock motor Implausible signal	Door Control Unit

These codes indicate specific electrical or mechanical issues within the door lock system.

Diagnosis / Trigger Conditions

An attempt to open a door using either the interior or exterior door handle electrically transmits a signal to the door control unit via a microswitch. This microswitch then activates an electric motor within the door lock, which releases the rotary latch and opens the door. For mechanical backup, two Bowden cables connect the door lock to the handles.

If a microswitch or control motor fails, the interior door handle must be pulled out much further than its normal angle, and pulled twice, to activate the mechanical connection. The exterior handle can typically open the door after the lock cylinder or interior handle has been activated.

Before replacing any door lock components, technicians are instructed to first check if the complaint is due to incorrect operation. This involves clarifying the customer's experience and referring to the Owner's Manual for proper door lock functionality. The diagnostic process includes:

1. Reading out and erasing event memory entries in the control unit.
2. Checking if fault entries for the affected door are still logged after cycling the ignition and operating the door. If not, the door lock is considered functional.
3. Performing a mechanical inspection of the electrical wiring and Bowden cables for damage, irregularities, or stiffness. Affected components should be replaced if necessary.
4. Verifying that the exterior door handle returns to its flush, original position. If it does not, TSB 2060196, titled "57 Exterior door handles do not return to the zero position," should be consulted for modification or replacement.
5. Checking the door setting for ease of movement and proper closing, and adjusting if needed.

Repair Procedure Summary

If the complaint persists and event memory entries remain logged after the initial inspection and diagnostic steps, the affected door lock should be replaced according to the Workshop Manual. The TSB emphasizes that replacing parts or attempting repairs without following this specific bulletin will not resolve the problem.

Required Tools or Parts

To perform the diagnostic and repair procedures outlined in TSB 2063236/7, technicians will need specific equipment:

• VAS 6160/VAS 6150: A VAS tester running the current version of ODIS (Windows 10).

Important Warnings

Audi explicitly states that "Replacing parts or attempting repairs without taking this TSB into account will not fix the problem. Unjustified work/replacement parts will be charged back. In this case, invoicing under warranty is not permitted." This highlights the importance of following the TSB's diagnostic and repair steps precisely to ensure a valid warranty claim and effective repair.

Warranty Information

For vehicles outside of their warranty period, this Technical Service Bulletin is provided for informational purposes only. Warranty claims submitted for payment must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty. The claim comment should reference "As per TSB 2063236/7."

Labor Operations

Specific labor operations and their associated times (TU - Technical Units) are provided for various tasks, including:

• Checking 1-4 door handles (5711 0199, 10 TU)
• Front door trim panel remove + reinstall (7059 1900, see SRT)
• 2 Front door trim panel remove + reinstall (7059 2000, see SRT)
• Checking 1 front Bowden cable and wiring (5719 0199, 10 TU)
• Checking 2 front Bowden cables and wiring (5719 0299, 20 TU)
• Door lock front left/right remove + reinstall (5717 1950/5717 1951, see SRT)
• 2 Door lock front remove + reinstall (5717 2099, 50-170 TU depending on model)
• Rear door trim remove + reinstall (7073 1900/7073 2000, see SRT)
• Checking 1/2 rear Bowden cables and wiring (5819 0199/5819 0299, 10-20 TU)
• Door lock rear remove + reinstall (5817 1950/5817 1951, see SRT)
• 2 Door lock rear remove + reinstall (5817 2099, 50 TU)
• GFF (0150 0060, time stated on diagnostic protocol)
• Charge battery (2706 8950, see SRT)
• Road test prior/after service procedure (No allowance, 0 TU)

Production Solution

Audi has optimized the door lock manufacturing process to address the root cause of these issues, indicating that newer production vehicles may have improved components.

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Source: NHTSA ID 11009370