2022 Audi Models Instrument Cluster CNG Message TSB

Symptoms

Owners of various 2022 Audi models, including the A4, A5, A6, A7, A8, Q5, Q7, Q8, and e-tron series, may observe an unexpected warning message on their instrument cluster. This message appears specifically within the Audi Virtual Cockpit Gen2+ display. The warning indicates an issue related to Compressed Natural Gas (CNG) operation, presenting as either "CNG inspection due! CNG mode not available. Please contact workshop" or "CNG mode not available in XXX. Please contact workshop".

This Audi CNG message is particularly confusing for drivers whose vehicles are not equipped with a CNG fuel system. The message is described as highly sporadic, meaning it does not appear consistently. It is also noted that the message typically clears itself after the vehicle's ignition has been cycled, and therefore, it may not be reproducible during a diagnostic session.

Technical Background

Audi has identified the root cause of this erroneous display as a highly sporadic startup timing issue within the vehicle's electrical system. During certain startup sequences, a timing anomaly can cause the instrument cluster to briefly misinterpret vehicle parameters. This misinterpretation leads the system to display a message intended for CNG-equipped vehicles, even when the vehicle in question does not possess a CNG fuel system.

This anomaly is not indicative of a fault with the instrument cluster itself, nor does it suggest any underlying problem with the vehicle's actual fuel system or performance. It is purely a software-related display anomaly that occurs under specific, infrequent conditions, resulting in the Audi CNG message being shown incorrectly.

Important Warnings

It is critical for owners and technicians to understand that this Audi CNG message does not require any repair. Technical Service Bulletin 2067182/1 explicitly states, "Do not perform any repairs. Repairs for this concern may be denied by warranty." Attempting to diagnose or fix this non-existent CNG system issue could lead to unnecessary costs, as Audi will not cover such repairs under warranty. This warning prevents owners from being upsold on diagnostics or parts replacements that will not resolve the sporadic message, as there is no actual mechanical or software fault to correct.

Dealer Instructions

Audi has provided clear instructions to dealerships regarding this condition. Technicians are advised that "No repair is available at this time." Furthermore, they are instructed to "Do not perform any repairs" related to this concern, as such repairs "may be denied by warranty." Instead, service personnel should "Instruct the customer that this condition is normal and that the complaint can be resolved by cycling the ignition." This guidance ensures that customers are not charged for unnecessary diagnostic work or repairs for a non-existent problem.

Owner Action

If you encounter the Audi CNG message on your 2022 Audi, the recommended action is straightforward and simple. You should simply cycle the vehicle's ignition off and then back on. This action typically resolves the sporadic display, and the message should no longer be visible. Since no actual fault exists, there is no need to visit a workshop or seek diagnostic services for this particular warning. This condition is considered normal for the affected vehicles under specific, rare startup circumstances, and no further intervention is required.

Warranty Information

Audi Technical Service Bulletin 2067182/1 clarifies that this bulletin is for informational purposes only. The condition described, the erroneous display of the Audi CNG message, is not applicable to any Audi Warranty claims. This means that any attempts to perform repairs or diagnostics related to this message will not be covered under the standard vehicle warranty.

Source: NHTSA ID 10212939