2023 Audi A5 OBD Communication Fault TSB 2070383/1

Symptoms

Owners of affected 2023 Audi models may experience an Audi A5 OBD communication fault where a diagnostic tester cannot establish a connection with the vehicle. This issue is typically identified during pre-delivery inspection (PDI) or when attempting to connect an OBD scanner. The specific symptom noted is: "It is not possible to establish a connection between the vehicle and the diagnostic tester during the pre-delivery inspection."

Technical Background

Technical Service Bulletin (TSB) 2070383/1, issued on May 19, 2023, explains that the root cause of the Audi A5 OBD communication fault is often physical damage to the contacts within the diagnostic connection, specifically the U31 OBD socket. This damage is believed to occur during the production process, leading to widened or otherwise compromised pins that prevent proper electrical contact with diagnostic tools. The bulletin states: "Contacts on diagnostic connection U31 are damaged."

Repair Procedure Summary

If your 2023 Audi A4, A5, S4, S5, or RS 5 exhibits an Audi A5 OBD communication fault, a certified technician will perform the following steps:

1. Inspection: The technician will visually inspect the contacts on the diagnostic connection (OBD socket U31) for any signs of damage. This may involve removing the storage compartment under the dash panel to access the wiring harness.
2. Documentation: If damaged contacts are found, the technician will document the specific pin number(s) affected and attach photographic evidence to the DOC-IT system.
3. Repair: The damaged wires will be repaired as needed using a specialized wire harness repair set, specifically the VAS 1978 B tool.

This repair procedure is designed to restore proper communication between the vehicle and diagnostic equipment.

Required Parts and Tools

To address the Audi A5 OBD communication fault, technicians will utilize specific parts and tools:

• Individual wire: Part number 000979011E (as needed)
• Crimp connectors: Part number 000979940 (as needed)
• Wire harness repair set: Tool number VAS 1978 B

Warranty Information

This repair falls under Claim Type 110 and is covered for up to 48 months or 50,000 miles, whichever comes first. The service number associated with this bulletin is 9709, and the damage code is 0023. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual, as per TSB 2070383/1.

Important Information for Owners

Owners should be aware that if their 2023 Audi A4, A5, S4, S5, or RS 5 is outside of the specified warranty period (48 months or 50,000 miles), this Technical Service Bulletin is for informational purposes only. In such cases, the cost of diagnosis and repair for the Audi A5 OBD communication fault may not be covered by Audi warranty.

Source: NHTSA ID 10237016