2021-2024 Audi Incorrect Outside Temperature Display TSB

Owners of 2021-2024 Audi vehicles may notice what appears to be an Audi incorrect temperature display for the outside ambient temperature. This Technical Service Bulletin (TSB) 90 23 22 2032113/7, issued on April 13, 2023, provides important general information regarding the normal operation of the outside air temperature reading system. It clarifies that in many scenarios, the perceived inaccuracy is actually the system functioning as designed, rather than a faulty sensor.

This TSB supersedes an earlier bulletin, Group 90 number 22-57, dated April 14, 2022, reflecting updated information for newer model years.

Revision History

This bulletin has undergone several revisions to include additional model years:

• Revision 7 (April 13, 2023): Revised header to add Model Year 2024.
• Revision 6 (April 14, 2022): Revised header to add Model Year 2023.
• Revision 5 (April 29, 2021): Revised header to add Model Year 2022.

Symptoms

The primary symptom reported by customers is that "The outside ambient temperature display is incorrect."

How the Outside Temperature Display Works

Audi vehicles incorporate a sophisticated programming strategy for the outside temperature display to ensure accuracy and prevent misleading readings. This strategy accounts for various environmental factors and driving conditions:

• Smoothening Effect: The displayed temperature does not instantly reflect sensor measurements. It changes gradually, at a rate no faster than 4°F (2°C) per minute, for both rising and falling temperatures. This prevents rapid, fluctuating readings.
• Preventing Parked Vehicle Inaccuracies: To avoid incorrect readings caused by radiant heat from the engine bay or hot road surfaces when parked, specific logic is applied:
  • After the ignition is switched on, temperature changes are only shown after 30 seconds if the vehicle is stationary (speed = zero and engine off).
  • Rising temperature values are only displayed when the vehicle drives faster than 12 mph (20 km/h) during the first 3 miles (5 km).
  • If the measured ambient temperature is above the displayed value but falling, the display will not update.
  • When the coolant temperature reaches 104°F (40°C) and the vehicle speed drops below 12 mph (20 km/h), only falling ambient temperature values are shown. This is particularly relevant in stop-and-go traffic, where it can take time for the displayed temperature to correct itself.

Important Warnings for Owners

Owners should be aware of these critical points regarding the Audi incorrect temperature display:

• "If the conditions above are noted during these typical driving scenarios, the sensor is not at fault and does not need to be replaced."
• "This TSB is informational only and not applicable to any Audi warranty."

What Owners Should Do

If you observe what appears to be an Audi incorrect temperature display in your 2021-2024 Audi, it is important to understand the vehicle's normal operating logic as described in this bulletin. The system is designed to provide accurate readings over time, accounting for various driving and environmental conditions. If your observations match the scenarios outlined above, the temperature sensor is likely functioning correctly and does not require replacement. There is no repair procedure associated with this informational TSB, as it explains normal system behavior.

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NHTSA ID: 10234559