2024 Audi Q7 Engine Start System Warning TSB 2071735/1

Owners of various 2024 Audi models, including the A4, A5, Q7, and e-tron variants, may encounter warning messages related to the vehicle's engine start system. This issue, detailed in Audi Technical Service Bulletin (TSB) 2071735/1, specifically concerns a software anomaly within the Comfort Control Module -J393-.

Symptoms

Drivers may observe one of two specific messages appearing in the instrument cluster:

• "Engine start system: fault"
• "Power unit start system: fault"

It is important to note that despite these warnings, the vehicle typically exhibits no functional issues. The warnings are primarily informational, stemming from a software glitch rather than a mechanical failure.

Fault Codes / DTCs

When these warning messages appear, workshop diagnostics will likely reveal a specific Diagnostic Trouble Code (DTC) stored in the Comfort Control Module -J393- (address word 0046). The relevant fault code is:

• DTC B200047: Control Module Faulty, active/static – Symptom 65552.

This DTC confirms the presence of the software issue that triggers the instrument cluster messages.

Diagnosis and Trigger Conditions

The root cause of the "Engine start system: fault" or "Power unit start system: fault" messages is identified as a software issue within the Comfort Control Module -J393-. The presence of DTC B200047 in this module, specifically at address word 0046, is the primary diagnostic indicator. The issue does not stem from a hardware malfunction but rather an incorrect interpretation or reporting by the module's software.

Repair Procedure Summary

The resolution for this 2024 Audi Q7 Engine Start system warning involves a software update to the Comfort Control Module -J393-. The procedure, outlined in TSB 2071735/1, requires technicians to:

1. Follow the instructions detailed in TSB 2011732, which covers general "00 Software Version Management (SVM), operating instructions."
2. Update the Comfort Control Module -J393- (address word 0046) using the SVM action code 46A034.

This update will change the software version from the older 0627 to the newer 0628 (or a higher version), while retaining the software part number 8W1.907.064.*.

Important Warnings

Owners and technicians should be aware of specific requirements during the software update process:

• Key Placement: "The key must be on the emergency reader coil during the update." This is a critical step to ensure uninterrupted communication and successful module programming.
• Warranty Coverage: "If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only." This means that for vehicles no longer under warranty, the cost of this software update may not be covered by Audi.

Warranty Information

This software update is generally covered under Audi's warranty for eligible vehicles. The specific claim details are:

• Claim Type: 110 (up to 48 Months/50,000 Miles) or G10 for Certified Pre-Owned (CPO) vehicles (owner verification required).
• Service Number: 5789
• Damage Code: 0039
• Labor Operations: Software Update (Includes checking for DTCs) - 0151 0000.
• Diagnostic Time: No allowance for GFF, road test prior, or road test after service procedures (all 0 TU).
• Claim Comment: As per TSB 2071735/1.

Owner Action

If your 2024 Audi, including models like the A4, A5, or Q7, displays the "Engine start system: fault" or "Power unit start system: fault" message, indicating a potential 2024 Audi Q7 Engine Start system warning, it is recommended to contact your authorized Audi dealer. Inform them about the specific warning message and mention Technical Service Bulletin 2071735/1. The dealer will perform a diagnostic scan to confirm DTC B200047 and then apply the necessary software update to the Comfort Control Module -J393-.

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Source: NHTSA ID 10244488