2021-2025 Audi Engine Temperature Too High TSB P00B700

Audi has released Technical Service Bulletin (TSB) 2077593/2 to address concerns regarding the engine temperature being too high in certain 2021-2025 Audi vehicles equipped with the 4-cylinder 2.0 TFSI engine. This issue can manifest with specific diagnostic trouble codes (DTCs) and warning messages appearing on the instrument cluster. The TSB outlines a software update for the engine control module as the primary solution to rectify these conditions.

Symptoms

Owners of affected Audi vehicles may notice several indicators that point to this issue. The most common symptom reported by customers is the illumination of the coolant level warning lamp. This light signals a potential problem with the vehicle's cooling system, prompting concern from the driver.

Additionally, the vehicle's information, navigation, communication, or entertainment system may display warning symbols related to low coolant or coolant temperature. These messages, such as a "low coolant/coolant temperature warning display," serve as critical alerts to the driver about the engine's thermal management system. Workshop findings also indicate that the coolant thermostat might exhibit "no function" errors, further contributing to the Audi engine temperature too high P00B700 condition.

Fault Codes / DTCs

When diagnosing the Audi engine temperature too high P00B700 issue, technicians may find one or more of the following diagnostic trouble codes (DTCs) stored in the engine control module (J623), which is identified by address word 0001. These codes provide specific details about the nature of the cooling system malfunction:

Diagnostic address	Diagnostic trouble code	Fault symptom	Storage state
0001 - Engine electronics	P011600: Engine Coolant Temperature Sensor 1 Circuit Range/Performance	Intermittent	Intermittent
0001 - Engine electronics	P268100: Engine Coolant Bypass Valve Control Circuit/Open	Intermittent	Intermittent
0001 - Engine electronics	P00B700: Engine Coolant Flow Low/Performance	Intermittent	Intermittent

These DTCs indicate problems ranging from an intermittent coolant temperature sensor reading to issues with the coolant bypass valve control circuit and low coolant flow. All these conditions can contribute to the engine running at an elevated temperature.

Technical Background

The root cause of the Audi engine temperature too high P00B700 and related symptoms is identified as a software anomaly within the engine control module (J623). The engine control module is responsible for managing various engine functions, including the cooling system. An outdated or faulty software version can lead to incorrect readings, improper control of cooling components, and ultimately, the illumination of warning lights and the storage of DTCs.

To resolve these issues, the software for the engine control module, J623 (address word 0001), requires an update. This update will recalibrate the module's logic, ensuring accurate monitoring of engine temperature and proper operation of the cooling system components, thereby preventing the Audi engine temperature too high P00B700 condition.

Important Warnings for Owners and Technicians

Audi has issued specific warnings within TSB 2077593/2 that are crucial for both technicians performing the repair and owners to understand, especially concerning vehicles equipped with high-voltage components:

• High-Voltage Battery Precaution: "To prevent charging of the high-voltage battery during the software update, the high-voltage cable is to be removed BEFORE entry of the SVM code on vehicles with high-voltage components." This step is critical because "Charging the high-voltage battery during a software update can damage the high-voltage components." This emphasizes the importance of following precise procedures to protect sensitive electrical systems during service.
• DoIP Communication: "Always use DoIP when flashing a control module via ODIS in supported vehicles." DoIP (Diagnostics over Internet Protocol) is a modern communication standard used for diagnostics and flashing control modules. Activating DoIP ensures reliable and efficient data transfer during the software update process. Technicians must navigate to Administration >> General >> GFF Process >> DoIP communication and select "Only allow DoIP communication" to enable this feature.
• Chip Tuning Advisory: The TSB also contains a significant warning regarding aftermarket engine modifications. If the engine control unit has been altered by chip tuning, updating the software will render the chip tuning ineffective. In some cases, the software update could even damage an engine control unit that has been chip-tuned. Audi states that damage resulting from chip tuning cannot be billed under warranty. Owners who have had their vehicle chip-tuned should clarify with the tuning company whether a software update is possible before proceeding. This protects both the owner from potential damage and the dealership from warranty disputes.

Repair Procedure Summary

The repair for the Audi engine temperature too high P00B700 and associated DTCs involves updating the software of the engine control module (J623). This procedure is performed using Audi's Software Version Management (SVM) system, following instructions outlined in TSB 2011732: 00 Software Version Management (SVM), operating instructions.

1. Preparation: Before initiating the software update, especially on vehicles with high-voltage components, the high-voltage cable must be removed. This prevents unintended charging of the high-voltage battery, which could lead to damage during the update process. Technicians must also ensure DoIP communication is enabled in ODIS for supported vehicles.
2. Software Update: The engine control module (J623) is updated using the SVM action code 01A267. This code directs the diagnostic system to download and install the correct software version for the specific vehicle model. For FY* models, the software part number 80A 906 259 M is updated from version 0005 to 0006. For 8Y* models, the software part number 8Y0 906 259 J is updated from version 0004 to 0005.
3. Completion: After the software update is successfully completed, the diagnostic session will automatically reset. Technicians can verify DoIP activity by observing a red LED on the VAS 6154(A) diagnostic tool.

This software update ensures that the engine control module operates with the latest calibrations and logic, effectively resolving the issues leading to the Audi engine temperature too high P00B700 fault.

Warranty Information

For vehicles still under warranty, this software update is typically covered. The TSB specifies the following details for warranty claims:

• Claim Type: If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.
• Service Number: 1958
• Damage Code: 0017
• Labor Operations: Software update (0151 0010) and Software update (0151 0060), with time stated on the diagnostic protocol.
• Claim Comment: As per TSB 2077593/2

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual. Claims are subject to review and audit by Audi Warranty. Owners should note that damage resulting from aftermarket chip tuning is not covered under warranty.

Owner Action

If you own a 2021-2025 Audi model listed above and are experiencing an "engine temperature too high" warning, a "low coolant/coolant temperature warning display," or if your vehicle has been diagnosed with DTCs P00B700, P011600, or P268100, it is recommended to contact your authorized Audi dealership. Inform them about the symptoms and the specific diagnostic trouble codes if you have them. Reference Audi Technical Service Bulletin 2077593/2 when discussing the issue with your service advisor.

The dealership will be able to perform the necessary software update on your engine control module (J623) to resolve the underlying issue. If your vehicle has high-voltage components or has undergone aftermarket chip tuning, be sure to discuss these details with your service center to ensure the correct procedure is followed and to understand any potential warranty implications.

Source: NHTSA ID 11018986