2021-2023 Audi A6/A7 TPMS Light On DTC U012700

Symptoms

Owners of affected 2021-2023 Audi A6, A7, S6, S7, RS 6 Avant, RS 7, and A7 e vehicles may notice one or more of the following symptoms:

• A "TPMS message in the instrument cluster" appears.
• The "TPMS light is on" in the dashboard.
• The tire pressure monitoring system (TPMS) warning light is illuminated.

Fault Codes / DTCs

When diagnosing the issue, technicians may find that the Tire Pressure Monitoring System control module, J502 (address word 0065), cannot be reached with the diagnostic tester. The following Diagnostic Trouble Code (DTC) may be stored as active or static in the data bus on-board diagnostic interface, J533 (address word 0019):

• U012700: Tire Pressure Monitoring Control Module - no communication (with symptom code 131595).

Diagnosis / Trigger Conditions

The primary cause for the Audi A6 TPMS light U012700 is moisture ingress into the Tire Pressure Monitoring System control module (J502). This moisture enters through the pressure equalization element, causing the control module to fail. If the control module cannot communicate, the TPMS warning light will illuminate.

Technical Background

Moisture can penetrate the TPMS control module (J502) through its pressure equalization element. This ingress of moisture leads to a failure of the control module, resulting in communication loss and the illumination of the TPMS warning light. Audi implemented a production solution from July 2022 by introducing an improved bracket, part number 4E0 810 675 B, to mitigate this issue in new vehicles.

Repair Procedure Summary

To address the Audi A6 TPMS light U012700 and related symptoms, Audi Technical Service Bulletin 2065474/4 outlines the following repair steps:

1. Initial Inspection: Technicians should first check the wiring and pins in the connector for any damage and measure the voltage supply at the TPMS control module, J502 (address word 0065).
2. Module Replacement: If no wiring or voltage irregularities are detected, the Tire Pressure Monitoring System control module, J502, must be replaced. During this step, a new bracket, part number 4E0 810 675 B, is also installed. This new bracket helps prevent future moisture entry.
3. Wiring Routing: Ensure the wiring is correctly routed at both the new bracket and the connector. Proper routing is crucial for sealing the wiring effectively.
4. System Test: After replacement and reassembly, the system must be tested to confirm that all tire pressures are being read correctly and the TPMS warning light is off.

Required Tools or Parts

To perform this repair, the following parts and tools are required:

• TPMS Control Module: Quantity 01 (Refer to ETKA for specific part number).
• Bracket: Part number 4E0810675B, Quantity 01.
• Fasteners, Bolts, Nuts, and Screws: As needed (Refer to ETKA/ELSA for specific requirements).

Warranty Information

This repair is covered under warranty for eligible vehicles. The standard claim type is 110 for vehicles up to 48 months/50,000 miles. For Certified Pre-Owned (CPO) vehicles, claim type G10 applies, requiring owner verification. The Service Number for this bulletin is 4434, and the Damage Code is 0040. Labor operations include:

• Check Tire Pressure Monitoring System control module: 4434 0199 (10 Time Units)
• Repair Tire Pressure Monitoring System control module: 4434 4199 (10 Time Units)
• Diagnostic Time (GFF): 0150 0000 (Time stated on diagnostic protocol, Max 40 Time Units)
• Road test prior to service: No allowance (0 Time Units)
• Road test after service: 0121 0004 (10 Time Units)

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Important Warnings

• Out-of-Warranty Vehicles: If your vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only. This implies that repairs may not be covered by Audi and could be at the owner's expense.

Owner Action

If your 2021-2023 Audi A6, A7, S6, S7, RS 6 Avant, RS 7, or A7 e is displaying a "TPMS message in the instrument cluster" or has the TPMS light on, especially if you suspect a communication issue with the TPMS control module, it is recommended to schedule an appointment with an authorized Audi service center. Inform them about the symptoms and mention Technical Service Bulletin 2065474/4. The technicians will perform diagnostics, confirm the presence of DTC U012700, and carry out the necessary repairs, which involve replacing the TPMS control module and its bracket.

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Source: NHTSA ID: 10238312