2023 Audi Q7 Engine Start Delay TSB 2079917/1

Owners of the 2023 Audi Q7 45 TFSI may notice that their vehicle's engine experiences a delay when starting. This specific condition, where the engine can only be started with a delay, is addressed by Audi Technical Service Bulletin (TSB) 2079917/1. This TSB provides a solution for this inconvenience, which stems from a software-related issue within the engine control unit.

The TSB, released on November 11, 2025, applies to all 2023 Audi Q7 45 TFSI models. The primary fix involves updating the software for the engine control module, also known as J623.

Symptoms

The most prominent symptom reported by customers is that the "Engine can only be started with a delay." This means the vehicle takes longer than usual to crank and ignite the engine, which can be a frustrating experience for drivers.

Fault Codes / DTCs

When diagnosing the Audi Q7 engine start delay, technicians may find specific event memory entries logged in the engine control unit. These diagnostic trouble codes (DTCs) pinpoint the underlying electronic issue:

Code	Symptom Code	Description
P157000	15072	Engine control module locked
P164000	14989	Control module faulty

These codes indicate that the engine control module (J623) is either locked or malfunctioning, preventing a prompt engine start.

Technical Background

The root cause of the Audi Q7 engine start delay is identified as a software anomaly within the engine control module, J623 (address word 0001). The original software version did not adequately address certain conditions, leading to the delayed start symptom and the associated fault codes. Audi's production solution involves new software designed to correct this specific issue.

Repair Procedure Summary

The repair for the engine start delay involves a software update to the J623 engine control module. Technicians are instructed to follow the guidelines provided in TSB 2011732, which details the Software Version Management (SVM) operating instructions. The update process requires the use of a specific SVM action code.

To perform the update, the technician will:

1. Consult TSB 2011732 for detailed instructions on Software Version Management (SVM).
2. Update the J623 (0001) control unit using the SVM action code 01A320. This update will bring the software to a new target data container version, 0006, from older versions ranging from 0002-0005. The target data container number remains 4M0906259AB.

This software update ensures the engine control module operates correctly, resolving the delayed start condition and clearing the related fault codes.

Important Warnings for Owners

Audi emphasizes several important points regarding this software update:

• Previous Modifications: This software update may neutralize any previous modifications made to the vehicle's software by the customer or third parties. Owners who have had their vehicle's software tuned or altered should be aware of this potential outcome.
• Declining the Update: If a customer chooses to decline the software update, they should be informed that this decision could lead to continued issues or restrictions with the use of the vehicle or individual components. It is crucial for owners to understand the potential consequences of not applying the recommended fix for the Audi Q7 engine start delay.

Warranty Information

For vehicles still under warranty, claims for this software update should be submitted in accordance with the Audi Warranty Policies and Procedures Manual. The service number for this repair is 2470, and the damage code is 0039. If the vehicle is outside of its warranty period, this Technical Service Bulletin 2079917/1 is provided for informational purposes only, meaning the repair cost may not be covered.

Owner Action

If your 2023 Audi Q7 45 TFSI is experiencing an engine start delay or if you suspect your vehicle may be affected by the conditions described in TSB 2079917/1, it is recommended to contact your authorized Audi dealer. They can diagnose the issue, confirm the presence of DTCs like P157000 or P164000, and perform the necessary software update to the engine control module (J623). This update is crucial for resolving the Audi Q7 engine start delay and ensuring proper vehicle operation.

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Source: NHTSA ID: 11026248