2019-2022 Audi A6 / A7 TPMS Light On, DTC U012700

Audi has released Technical Service Bulletin (TSB) 44 22 91 2065474/2 to address an issue where the Tire Pressure Monitoring System (TPMS) warning light illuminates in the instrument cluster. This TSB, issued on March 17, 2022, supersedes an earlier bulletin, Group 44 number 21-85, dated December 9, 2021. The problem specifically affects various 2019-2022 Audi A6 and A7 models equipped with a Direct TPMS System, where a diagnostic trouble code (DTC) U012700 may be stored.

The core of the problem stems from moisture ingress into the Tire Pressure Monitoring Control Module (J502), which can lead to its failure and subsequent communication issues. Owners experiencing an Audi A6 TPMS light U012700 should be aware of these potential causes and the recommended repair procedures.

Symptoms

Owners typically report one primary symptom related to this issue:

• The tire pressure monitoring system (TPMS) warning light is on in the instrument cluster.

Fault Codes / DTCs

When diagnosed, the following fault code may be found as active or static in the data bus on board diagnostic interface (J533, address code 0019):

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

Diagnosis / Trigger Conditions

Technicians will first confirm the customer's concern by reproducing the illuminated TPMS warning light. Further diagnosis involves checking the Tire Pressure Monitoring Control Module (J502, address code 0065). If this module cannot be reached with the diagnostic tester, it indicates a communication problem, often accompanied by DTC U012700.

The technical background indicates that moisture can enter the J502 control module through its pressure equalization element. This moisture then causes the control module to fail, leading to the communication error and the illuminated TPMS warning light.

Repair Procedure Summary

Addressing the Audi A6 TPMS light U012700 issue involves a multi-step process:

1. Initial Inspection: Technicians will thoroughly check the wiring and pins connected to the Tire Pressure Monitoring Control Module (J502) for any signs of damage. They will also measure the voltage supply to the module to ensure it's receiving adequate power.
2. Module Replacement: If no wiring or power supply irregularities are detected, the next step is to replace the Tire Pressure Monitoring Control Module (J502). Alongside the new module, a new bracket, part number 4E0 810 675 B, must be installed. This new bracket replaces the original bracket, part number 4K0 907 249 A, as shown in the TSB's figures.
3. Wiring Routing: Special attention is given to ensuring the wiring is routed correctly and straight into the connector housing. This is crucial for maintaining proper sealing and preventing future moisture ingress.
4. System Test: After the replacement and routing, the system is tested to confirm that all tire pressures are being read correctly and the TPMS warning light is off.

Required Parts

For the repair of the Audi A6 TPMS light U012700, the following parts are needed:

• Bracket: Part number 4E0 810 675 B (Quantity 01)
• TPMS Control Module: (Quantity 01) – specific part number to be determined via ETKA.
• Fasteners, Bolts, Nuts, and Screws: As needed per the repair manual, to be determined via ETKA/ELSA.

Important Warnings

• Production Solution: Audi notes that a permanent production solution for this issue is currently under development. The bulletin will be updated once more information is available.
• Warranty Coverage: If your vehicle is outside of its warranty period (typically up to 48 months/50,000 miles, or for CPO vehicles under G10 claim type), this Technical Service Bulletin is for informational purposes only. The repair cost may not be covered by Audi.

Owner Action

If you own a 2019-2022 Audi A6, A7, A6 allroad, S7, S6, RS 6 Avant, A7 e quattro, or RS 7 and are experiencing the TPMS warning light illuminating with a stored DTC U012700, you should schedule an appointment with an authorized Audi service center. Provide them with the details of the issue and reference Technical Service Bulletin 44 22 91 2065474/2. The service center will diagnose the problem and perform the necessary repair, which typically involves replacing the TPMS control module and its bracket.

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Source: NHTSA ID: 10209247