2023-2024 Audi Gateway Control Module Replacement (90X4)

Audi has launched Service Action Code 90X4, a proactive measure to replace the Gateway Control Module in a range of 2023-2024 Audi vehicles. This service action, originally published on May 21, 2024, ensures the proper functioning of critical vehicle communication systems. Owners of affected models, such as the 2023 Audi Q8, will have this repair performed free of charge by an authorized Audi dealer.

The Gateway Control Module, identified as "INTERFACE (Gateway control module)" in the parts list, is a central component responsible for data exchange between various control units in your vehicle. Its correct operation is vital for the seamless performance of multiple vehicle systems. This action, identified by Service Action Code 90X4, addresses potential issues with this module before they manifest.

What's Being Addressed

Service Action 90X4 involves the replacement of the vehicle's Gateway Control Module. This module acts as a central hub for data communication across various electronic control units (ECUs) within the vehicle. Ensuring its proper function is critical for the overall electrical system and the operation of numerous vehicle features.

Affected Audi Models

This service action applies to various 2023-2024 Audi models, including the A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A5 Sportback, A6 Allroad, A6 Sedan, A7, A8, e-tron GT, e-tron Quattro, e-tron Sportback Quattro, Q5, Q5 Sportback, Q7, Q8, RS e-tron GT, RS5 Coupe, RS5 Sportback, RS6 Avant, RS7, RSQ8, S4 Sedan, S5 Cabriolet, S5 Coupe, S5 Sportback, S6 Sedan, S7, S8, SQ5, SQ5 Sportback, SQ7, and SQ8.

Important Warnings and Owner Information

Owners should be aware of several critical points regarding this service action:

• Campaign Expiration: This service action is available free of charge only until May 21, 2029. If you wish to have this work performed after this date, your normal costs associated with this work will apply.
• New Vehicle Delivery: Audi dealers must ensure that every affected inventory vehicle has this campaign completed before delivery to consumers.
• Protective Cover Installation: Vehicles equipped with a protective cover over the gateway MUST have a new cover installed during the replacement of the gateway. Failure to properly install the cover can result in future damage to the gateway. Technicians are warned of the "Risk of incorrect installation!" and must follow ELSA repair manual steps to install the cover properly.
• Pre-existing Conditions: Diagnosis and repair of pre-existing conditions in the vehicle are not covered under this campaign.
• Other Recalls: "All Safety Recalls must be completed prior to completing this campaign."
• Claiming Wash/Loaner: Dealers are instructed, "Do not claim wash/loaner under this action."
• Grommet Requirement: For A5/S5 Cabrio models, the document explicitly states, "A5/S5 Cabrio models only – GROMMET is not required. DO NOT enter on claim."

Required Tools and Parts

To perform this service action, specific tools and parts are required:

Required Tools

• Battery Tester/Charger: Capable of a minimum 90 Amp continuous supply (e.g., VAS 5908).
• Diagnostic Tester: Such as VAS6150X/6160X (or equivalent).
• Scraper Set: VAS6845- (e-Tron GT only).
• Pliers: T40172C- (or equivalent, e-Tron GT only).

Required Parts

• Gateway Control Module: Identified as "INTERFACE (Gateway control module)" (Part Number: SEE ETKA).
• Cover: Part Number 4K0-907-578-A (for 4A or 4K criteria) or 80A-907-577-C (for FY criteria).
• Grommet: Part Number 5G0-886-373 (for 4A, 4K, 8W or F5 criteria) or 80A-886-373 (for FY criteria).

Parts control type is either "VIN to Order" (for US Dealers using AVA) or "Free Order" (managed by Audi). Initial allocation of parts is not provided.

Repair Procedure Summary

The repair for Service Action 90X4 involves replacing the Gateway Control Module and performing necessary diagnostic and calibration steps. The general procedure is as follows:

1. Pre-Repair Check: Technicians will verify the vehicle's VIN in the Audi Elsa system to confirm eligibility and ensure the campaign status is "open." Any multiple software update campaigns must be performed in order of their start date, oldest first.
2. Initial Scan and Fault Recording: The vehicle is scanned using the Guided Functions (GFF) diagnostic system. Technicians must note any pre-existing faults and test plans, as diagnosis and repair of these are not covered by the campaign. Common diagnostic items seen during a scan include 00A5-SVM-Check control module configuration, CAN data bus, malfunction, J794-BAP communication fault, Parking aid sensor, environmental influences, J1121 - Driver Assistance Systems Control Module, cancel parallel parking assist, J769 - Restricted view, J770 - Restricted view, and 01-Check warranty info.
3. Gateway Control Module Replacement Test Plan: The "0019 - Replace control module (J533)" test plan is initiated under guided functions. This step is crucial as it allows data from the old module to be collected and loaded onto the new module.
4. Physical Replacement: The gateway control module is replaced following the detailed instructions in the ELSA repair manual, specifically under "Electrical System > Electrical Equipment > 97 Wiring > Control Modules > Data Bus On Board Diagnostic Interface J533, Removing and Installing." If applicable, a new protective cover must be installed correctly.
5. Post-Replacement Test Plans: After the physical replacement and initial test plan, several new test plans may automatically generate. Technicians must perform only the "0015 – Basic setting inertial sensor" test plan at this time.
6. Bus Sleep Procedure: A critical step after basic settings for inertial sensors is to perform a bus sleep. Failure to do so can lead to inaccurate results or malfunctions. The procedure involves:
   • Switching off the ignition.
   • Removing the diagnosis interface and battery charger.
   • Closing all doors, front, and rear lids.
   • Locking the vehicle and moving the key away.
   • Waiting at least 5 minutes for the vehicle to enter bus silence.
   • Unlocking the vehicle, reconnecting the battery charger, and inserting the diagnosis interface.
   • Switching on the ignition.
7. Final Diagnostic Steps: Exit diagnosis by selecting "Yes" to end the diagnostic session. If prompted to continue Guided Fault Finding, select "NO." The GFF exit process will erase fault memory. If active/static faults remain, and ODIS prompts to calculate new test plans, select "YES." Only test plans related to the gateway replacement should be performed.
8. Campaign Completion Label: A Campaign Completion label (Part Number CAMP 010 000) must be filled out and affixed next to the vehicle emission control information label, ensuring it does not cover existing labels.

Claim Information

For warranty claims related to Service Action 90X4, the following details apply:

• Service Number: 90X4
• Damage Code: 0099
• Parts Vendor Code: 002
• Claim Type: Sold vehicle (7 10), Unsold vehicle (7 90)
• Causal Indicator: INTERFACE*

Labor operations vary by vehicle criteria but generally include:

• 9035 55 00 or 9035 19 00 or 9035 19 50: Data bus control module replace
• 0150 00 99: Perform bus sleep
• 2706 89 50: Battery charge
• 0150 00 60: GFF/Guided functions (GFF Operations)
• Additional labor operations like 7455 19 60 (Armrest with cover remove+reinstall), 7249 20 07 (2 Rear bench seat remove+reinstall), 6817 19 00 (Console remove+reinstall), 7201 19 00 or 7201 19 05 (Front seat remove+reinstall) may be required depending on the vehicle configuration.

What Owners Should Do

If you own a 2023-2024 Audi model, including the 2023 Audi Q8, and believe it may be affected by Service Action 90X4, you should contact your authorized Audi dealer as soon as possible to schedule the Gateway Control Module replacement. The work will be performed free of charge. You can find an authorized Audi dealer and check your vehicle's eligibility using your Vehicle Identification Number (VIN) on www.audiusa.com. For any questions, you can contact Audi Customer Experience at 1-800-253-2834.

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Source: NHTSA ID: 10255562