2019-2022 Audi TFSI Mild Hybrid Coasting Function Not Available

Audi has issued Technical Service Bulletin (TSB) 2074811/1, also identified as 24 24 62 2074811/1, to address customer inquiries regarding the intelligent coasting function on certain 2019-2022 Audi models equipped with the 4-cylinder 2.0 liter TFSI mild hybrid engine. This bulletin, dated July 31, 2024, provides important information explaining why owners might experience the message "coasting function not available" or observe that the "Intelligent coasting does not work."

This TSB is purely informational, clarifying the intended behavior of the Audi TFSI coasting function rather than outlining a repair for a defect. It helps owners and technicians understand the specific conditions under which the system operates or is intentionally deactivated.

Symptoms and Customer Observations

Owners of affected Audi vehicles, including the A4, A5, A6, Q5, and SQ5 models from 2019-2022, may report that the intelligent coasting function does not work as expected. The primary customer statement is that "Intelligent coasting does not work." Despite the coasting feature being activated within the Multi Media Interface (MMI) system, workshop findings confirm that it often only functions when the cruise control system is switched on.

This observed behavior, where the Audi TFSI coasting function appears unavailable or only works under specific conditions, is not indicative of a fault. Instead, it reflects a deliberate design choice by Audi to optimize the driving experience and prevent undesirable vehicle responses.

Technical Explanation: Why Coasting is Deactivated

Audi's technical background provides a clear explanation for this behavior. To avoid coasting phases that are too short and potentially disruptive, the coasting function is intentionally deactivated by the manufacturer on vehicles that are not equipped with both a navigation system and front radar. In these specific configurations, the function "cannot be activated" at all.

The rationale behind this deactivation is to prevent noticeable effects for the driver, such as juddering or unexpected deceleration, which could occur during restarts after very short coasting phases. The system is designed to provide a smooth and comfortable driving experience. Therefore, the Audi TFSI coasting function is primarily activated when the cruise control system is switched on, as it is assumed that the vehicle will be traveling at a constant speed for an extended period under these conditions, making coasting more effective and seamless.

Important Considerations for Owners

It is crucial for owners to understand that Audi Technical Service Bulletin 2074811/1 is informational only. It clarifies the design and operational parameters of the intelligent coasting function and does not describe a defect requiring repair. The condition described, where the "coasting function not available" message appears or the function only works with cruise control, is considered normal operation based on the vehicle's configuration and current driving conditions.

This TSB explicitly states that it is "not applicable to any Audi warranty." There is no production solution or service procedure outlined in this bulletin because the behavior is by design. Owners should not expect a repair or warranty coverage for this specific condition, as their vehicle is likely operating exactly as intended by the manufacturer.

Source: NHTSA ID: 11005862