2022-2023 Audi CNG Mode Message TSB

Owners of various 2022-2023 Audi models may occasionally see an erroneous "CNG mode not available" message displayed in their instrument cluster. This Technical Service Bulletin (TSB) clarifies that this is a known, sporadic issue and does not indicate a genuine problem with the vehicle's fuel system.

Symptoms

Owners may observe one of the following messages appearing briefly in their Virtual Cockpit Gen 2+ instrument cluster:

• "CNG inspection due! CNG mode not available. Please contact workshop"
• "CNG mode not available in XXX. Please contact workshop"

These messages are displayed very sporadically and will typically disappear after the ignition is cycled. The condition may not be reproducible during a service visit due to its intermittent nature.

Technical Background

Audi has identified that a highly sporadic startup timing issue within the vehicle's systems can cause this incorrect "Audi CNG mode message" to be displayed. This occurs even in vehicles that are not equipped with a Compressed Natural Gas (CNG) fuel system, making the message misleading.

Important Warnings for Owners and Technicians

Audi has provided specific instructions regarding this condition:

• "Do not perform any repairs. Repairs for this concern may be denied by warranty." This explicitly states that no corrective action is needed, and attempts to repair this non-issue may not be covered by warranty.
• This TSB is for informational purposes only and is not applicable to any Audi warranty claim for a repair.

Owner Action

If you experience the "Audi CNG mode message" in your 2022-2023 Audi, there is no need for concern or immediate action. Audi advises customers that this condition is considered normal for the affected vehicles.

To resolve the temporary display of the message, simply cycle the ignition (turn the vehicle off and then back on). The message is expected to appear very sporadically and is unlikely to be displayed multiple times consecutively. No visit to the dealership is required for this particular issue.

Revision History

This TSB, reference 90 23 96 2067182/3, has undergone several revisions to provide updated information:

• Revision 3 (January 31, 2023): Revised header to include Model Year 2023 and added clarification to the service instructions.
• Revision 2 (June 6, 2022): Corrected a display issue.
• Revision 1 (May 27, 2022): Initial publication.

This bulletin supersedes Technical Service Bulletin Group 90 number 22-68, dated June 6, 2022.