2021-2025 Audi Engine Temperature TSB 2077593/1

Symptoms of High Engine Temperature

Owners of certain 2021-2025 Audi vehicles may notice a "low coolant temperature warning display" activating in the instrument cluster. This warning indicates a potential problem with the engine's cooling system, specifically related to the engine coolant temperature or flow. The underlying issue often points to a malfunction with the coolant thermostat, leading to the "Audi engine temperature too high" condition.

Diagnostic Trouble Codes (DTCs)

When diagnosing the "Audi engine temperature too high" condition, technicians may find one or more of the following diagnostic trouble codes (DTCs) stored in the engine control module (J623, address word 0001). These codes are typically intermittent.

Diagnostic Trouble Code	Description
P00B700	Engine Coolant Flow Low/Performance
P011600	Engine Coolant Temperature Sensor 1 Circuit Range/Performance
P268100	Engine Coolant Bypass Valve Control Circuit/Open

Technical Background

The root cause for these symptoms and DTCs, including the "Audi engine temperature too high" warning, is often an outdated software version within the engine control module (J623). Audi Technical Service Bulletin 2077593/1 specifies that an update to this software is required to address the issue. This software update helps ensure proper management of engine coolant flow and temperature, preventing the vehicle from operating with an "Audi engine temperature too high" condition.

Repair Procedure Summary

The primary repair for the "Audi engine temperature too high" issue, as detailed in TSB 2077593/1, involves updating the software of the engine control module (J623). This is performed using the SVM (Software Version Management) action code 01A267. Technicians must follow specific instructions outlined in TSB 2011732 for SVM operating procedures to ensure the update is applied correctly.

For vehicles equipped with high-voltage components, a critical step is to remove the high-voltage cable before entering the SVM code. This precaution prevents potential damage to high-voltage components that could occur if the battery charges during the software update process. Additionally, it is essential to use DoIP (Diagnostic over Internet Protocol) when flashing control modules via ODIS in supported vehicles. DoIP communication must be activated through the diagnostic tool's administration settings, and its active status can be confirmed by observing a red LED on the VAS 6154(A) device. The software part numbers involved in this update are 80A.906.259.M* (old versions 0001-0005, new version 0006) and 8Y0.906.259.J (old versions 0001-0004, new version 0005).

Important Warnings for Owners and Technicians

Audi has issued several crucial warnings related to this software update, particularly concerning vehicles that may have undergone aftermarket modifications.

• Chip Tuning: If the engine control unit has been altered by chip tuning, updating the software will render the chip tuning ineffective. In some circumstances, the software update could even damage a chip-tuned engine control unit. Owners are advised to consult with their tuning company beforehand to determine if a software update is possible and to understand potential risks. Damage to the engine control unit resulting from chip tuning will not be covered under Audi AG warranty.
• High-Voltage Battery: For vehicles with high-voltage components, the high-voltage cable must be removed before entering the SVM code for the software update. Charging the high-voltage battery during the update process can cause damage to these components.
• DoIP Communication: Technicians must always use DoIP when flashing control modules via ODIS in supported vehicles. Failure to do so may lead to improper module programming.
• Warranty Implications: If a vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only. Owners should also be aware that neither Audi AG nor the dealership can be held responsible for damage caused by the software update if the engine control unit was chip-tuned, or for damage resulting from not having the update performed.

Warranty Information

For vehicles still under warranty, all claims submitted for payment related to this TSB must adhere to the Audi Warranty Policies and Procedures Manual. The service number for this operation is 1958, with a damage code of 0017. Labor operations for the software update are 0151 0010 and 0151 0060. If the vehicle is no longer under warranty, this Technical Service Bulletin serves as an informational guide only.

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NHTSA ID: 11017630