2022-2024 Audi U142100 and U164200 DTCs in Gateway

Owners of various 2022-2024 Audi models, including the Audi e-tron, may encounter diagnostic trouble codes (DTCs) U142100 and U164200 stored in the vehicle's gateway module. These codes, specifically "U142100: Control module for emergency call module and communication unit no communication – passive / sporadic" and "U164200: Ethernet Emergency Call Module no communication – passive / sporadic," are addressed by Audi Technical Service Bulletin (TSB) 91 24 78 2075537/2.

This TSB, which supersedes TSB Group 91 number 24-63 dated October 8, 2024, provides crucial information for technicians and owners regarding these specific fault entries. It clarifies that under certain conditions, these codes do not indicate a genuine malfunction requiring repair.

Symptoms and Fault Codes

If your Audi vehicle's data bus diagnostic interface (J533, address word 0019) has logged the following DTCs, this TSB applies:

• U142100: Control module for emergency call module and communication unit no communication – passive / sporadic
• U164200: Ethernet Emergency Call Module no communication – passive / sporadic

These codes specifically point to communication issues with the emergency call module control unit and communication unit (J949). The key distinction highlighted by Audi is whether these codes are logged as passive/sporadic or static.

Why These Codes Appear

Audi's technical background explains that these passive DTCs can be stored due to the control module's start-up behavior. There can be a variable delay for the ConBox (J949) to connect to the mobile network. This temporary communication interruption during startup is often the root cause of the U142100 and U164200 codes.

Crucially, as long as these diagnostic trouble codes are sporadic, they do not affect the overall functioning of the vehicle or the emergency call module itself. Therefore, they can often be disregarded.

Important Warnings for Owners

Audi's TSB 91 24 78 2075537/2 includes several critical advisories:

• "This service info is only valid if these two DTCs are logged as sporadic."
• "If the two event memory entries are logged as static, please follow the instructions in Guided Fault Finding (GFF)."
• "There is no reason to attempt any repairs. Replacing emergency call module control unit and communication unit J949 or data bus diagnostic interface J533 will not lead to a solution either."
• "Invoicing under warranty is not permitted. Unjustified work/replacement parts will be charged back."
• "This TSB is informational only and not applicable to any Audi Warranty."

These warnings emphasize that unnecessary repairs, especially component replacements, will not resolve the issue if the codes are sporadic and will not be covered under warranty. This is particularly relevant for the Audi e-tron U142100 U164200 issue.

What Owners Should Do

If you find that your 2022-2024 Audi is storing DTCs U142100 and U164200, it's important to determine if they are sporadic or static. If the codes are sporadic, no action is required, as they do not impact vehicle functionality. These types of codes are typically marked with a yellow triangle in a vehicle diagnostic tester, indicating they can be ignored.

However, if these codes are logged as static, it indicates a persistent issue. In such cases, you should consult an authorized Audi service center. They will need to follow the instructions in the Guided Fault Finding (GFF) system to diagnose and resolve the underlying problem.

Future Production Changes

Audi plans to incorporate robustness measures into new control unit versions from Model Year 2025 onwards. These measures are designed to prevent the sporadic storage of these DTCs in future vehicle production.

Source: NHTSA ID: 11011276