2025 Audi Q5/SQ5 Door Won't Open from Outside TSB

Audi has released Technical Service Bulletin (TSB) 2079914/3 for certain 2025 Audi Q5 and SQ5 models. This bulletin addresses a condition where one of the vehicle's doors cannot be opened intermittently from the outside. This issue can stem from a software or hardware problem within the door control unit or the door lock itself. Owners searching for "Audi Q5 door won't open B122D29" will find this TSB relevant.

Symptoms

Owners of affected 2025 Audi Q5 and SQ5 vehicles may experience the following:

• "One of the doors cannot be opened intermittently from the outside. It can always be opened from the inside. All other doors can be opened from the outside."
• After pulling the interior door handle of the affected door, it can then be opened again from the outside.

It's important to note that for vehicles equipped with a convenience key, care must be taken not to touch the sensor on the exterior door handle with a thumb while opening the door, as this can cause the vehicle to lock again. This behavior is considered normal operation and does not indicate a fault.

Fault Codes / DTCs

In some cases, the diagnostic address of the door control unit for the faulty door may log the following event memory entry:

• B122D29 - "Lock unit for central locking - implausible signal - passive/intermittent"

Technical Background

The underlying cause for a door that cannot be opened from the outside is identified as a software and/or hardware issue within the door control unit or the door lock mechanism.

Repair Procedure Summary

The diagnostic and repair process outlined in TSB 2079914/3 depends on whether the DTC B122D29 is present and the part version of the door lock.

If DTC B122D29 is logged:

1. Check the part version of the door lock installed on the faulty door without removing the component. The part version can be identified visually (as shown in Figure 2 of the TSB).
2. If the door lock part version is 08S or higher, proceed with the diagnostic steps for vehicles without an event memory entry.
3. If the door lock part version is 07S or lower, measure the resistance on the installed door lock between pin 2 and pin 4 using a multimeter. To do this, the lock must be put into temporary crash redundancy mode by removing the connector and firmly pulling the interior door handle twice.
   • Expected acceptable resistance values include: Temporary crash redundancy (TCR) at 1000 ohms; Switch for interior door handle (IDH) + TCR at 382 ohms; Switch for exterior door handle (EDH) + TCR at 212 ohms; IDH + EDH + TCR at 158 ohms. These measurements apply to vehicles with curved door handles, such as the Q5 type GU and Q6 e-tron type GF.
   • If the measured values deviate from these specifications, the affected door lock should be replaced.
   • If the measured values correspond to the expected values, the lock wiring should be checked using Guided Fault Finding. If the wiring is found to be acceptable, the door control unit of the faulty door should be replaced.

If DTC B122D29 is NOT logged (or if the part version is 08S or higher):

1. Verify if the complaint can be reproduced when the vehicle is unlocked.
2. If the complaint can be reproduced, replace the door control unit on the faulty door.
3. If the complaint cannot be reproduced, postpone the repair. In this scenario, replacing parts or attempting repairs will not resolve the issue, and invoicing under warranty is not permitted.
4. Additionally, check if TSB 2079690, a combined software update (03.10.00/C (28.13.01) KD2), is applicable to the vehicle. If so, perform the software update described in TSB 2079690.

Required Tools or Parts

• Multimeter for resistance measurements.
• Specific door lock part versions (08S or higher, 07S or lower) are referenced for diagnostic paths.

Important Warnings

• If the complaint of the "Audi Q5 door won't open B122D29" cannot be reproduced during diagnosis, do not replace parts or attempt repairs. Unjustified work or replacement parts will be charged back, and invoicing under warranty is not permitted.
• For vehicles with a convenience key, avoid touching the exterior door handle sensor with your thumb while opening the door, as this can inadvertently re-lock the vehicle.

Warranty Information

Warranty claims for this issue must be submitted in accordance with the Audi Warranty Policies and Procedures Manual. This TSB provides specific service numbers, damage codes, and labor operations for various repair scenarios:

• Claim Type: Problem reproduced without event memory entry "B122D29 - Lock unit for central locking - implausible signal" (Service Number 6438).
• Damage Code: 0040.
• Labor Operations: Include removing and installing door trim (7059 1900, 7073 1900), checking door locks (5717 0299, 5817 0299), measuring door locks (5717 0499, 5817 0499), removing and installing door lock (5717 1950, 5817 1950), removing and installing door control unit (6438 1950), and Guided Functions (0150 0060).
• Software Update (TSB 2079690): Service Number 6438, KD02. Labor operations include software update with battery charger (0151 0010) and a fixed rate for all preliminary and follow-up work (0151 0040).

If the vehicle is outside of any warranty, this Technical Service Bulletin is for informational purposes only.

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Source: NHTSA ID: 11031020