2021 Audi TPMS Display Issue DTC C1239F0 TSB

Owners of certain 2021 Audi models may notice that their vehicle's instrument cluster is not displaying tire pressure and temperature information while driving. This condition is often accompanied by the diagnostic trouble code (DTC) C1239F0, indicating a problem with tire pressure monitor position assignment. Audi has issued Technical Service Bulletin (TSB) 44 21 81 2062246/1 to provide a solution for this specific concern.

This TSB, released on February 18, 2021, applies to a range of 2021 Audi vehicles, including the A6, A7, S6, S7, RS 6, RS 7, A8, S8, Q7, Q8, SQ7, SQ8, and RS Q8, specifically those equipped with the Direct Tire Pressure System. The primary symptom is a missing display of tire pressure and temperature, which can be confusing for drivers who rely on this information, leading to the Audi TPMS C1239F0 fault.

Symptoms

Owners might observe the following symptom related to the Audi TPMS C1239F0 issue:

• The instrument cluster displays "Tire press. loss indic." and does not show individual tire pressure and temperature readings while driving. An example of this display is "-.-bar -- °C -.-bar -.-bar C".

Fault Codes / DTCs

When diagnosing this issue, technicians may find the following Diagnostic Trouble Code (DTC) stored in the vehicle's systems:

Code	Description	Module	Address Word
C1239F0	Tire pressure monitor position assignment not possible	Tire pressure monitoring system control module (J502)	0065

Technical Background

Audi has identified that this display issue can occur on vehicles manufactured between week 42 and week 48 of 2020. The core problem is not a system fault in the traditional sense, but rather a lack of a rotational direction signal from the tire pressure sensors. Without this signal, the control module cannot determine the exact fitting location of each sensor, preventing it from allocating the transmitted pressures to the correct positions on the vehicle.

It's important to note that despite the missing display, the pressure monitoring function itself remains active. The system will still provide a warning if there is a loss of pressure in a tire, though it will not indicate which specific tire is affected due to the position assignment issue. Vehicles produced from November 30, 2020, onward are equipped with a production solution to prevent this concern.

Repair Procedure Summary

To resolve the Audi TPMS C1239F0 condition, Technical Service Bulletin 44 21 81 2062246/1 outlines a specific service procedure. The primary step involves replacing all four pressure sensors in the wheels. This process should be performed according to the detailed instructions found in the Elsa Repair Manual, under the section for Chassis >> Wheels and Tires >> Tire Pressure Monitoring System >> Metal Valve Body Removing and Installing.

Before and after the sensor replacement, a road test is required to verify the repair. Diagnostic time, identified as GFF (0150 0000), should follow the time stated on the diagnostic protocol, with a maximum of 30 Time Units (TU). The road test prior to the service procedure (0121 0002) and the road test after the service procedure (0121 0004) are each allocated 10 TU.

Required Parts

To perform this repair, the following parts are necessary:

• Part Number: 5Q0907275F
  • Part Description: Wheel Sensor
  • Quantity: 04
• Part Number: See ETKA
  • Part Description: Fasteners, Bolts, Nuts, and Screws as needed per the Repair Manual
  • Quantity: See ETKA/ELSA

Warranty Information

This repair is covered under warranty for vehicles up to 48 months or 50,000 miles. For Audi Certified Pre-Owned (CPO) vehicles, the claim type is G10, and ownership must be verified. If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance only.

• Service Number: 4432
• Damage Code: 0012
• Labor Operation: Remove and install 4 tire pressure sensors (4432 2054)
• Diagnostic Time: GFF (0150 0000) - Max 30 TU
• Road Test Prior: 0121 0002 - 10 TU
• Road Test After: 0121 0004 - 10 TU

Claims for this service must be submitted as per TSB #2062246/1 and adhere to the Audi Warranty Policies and Procedures Manual.

NHTSA ID: 10190587