2021-2022 Audi Low Coolant Light Warning TSB 2061918/5

Symptoms

Owners of 2021-2022 Audi vehicles may observe the coolant warning light appearing in the instrument cluster. Specifically, the dashboard may display the message: "Turn off engine and check coolant level. See owner's manual". This warning occurs even when a visual inspection of the coolant expansion tank confirms that the coolant level is between the minimum and maximum marks.

Diagnosis / Trigger Conditions

The TSB 2061918/5 indicates that the primary cause for the "Audi low coolant light" warning, despite adequate coolant levels, stems from the vehicle's large coolant circuit capacity. This design can lead to significant fluctuations in coolant volume as the engine heats up and cools down. Furthermore, if the coolant circuit was not correctly filled or bled during manufacturing or previous service, it can result in the sporadic illumination of the low coolant level warning light. Technicians are instructed to first confirm that the warning displayed is indeed the coolant light (as shown in Figure 1 of the TSB) and not the distance warning light (Figure 2), which has a different diagnostic path.

Repair Procedure Summary

Audi Technical Service Bulletin 2061918/5 outlines a specific diagnostic and repair sequence to address the false "Audi low coolant light" warning.

1. Initial Documentation: The service process begins with the technician capturing a clear photograph of the current coolant level in the expansion tank. This image must then be uploaded to Audi's internal Doc-it system for record-keeping.
2. Precise Coolant Level Adjustment: The coolant level in the expansion tank must be meticulously checked and, if necessary, adjusted. This procedure requires strict adherence to the specifications detailed in the Elsa repair manual, and it must be performed when the engine is completely cold to ensure an accurate reading.
3. Coolant Level Sensor Connector Inspection: A critical step involves a thorough inspection of the electrical connector for the coolant level sensor. This includes examining all pins and contacts for any signs of corrosion, dirt, or physical damage. Ensuring a clean and secure connection is vital for proper sensor operation.
4. Connector Re-establishment and System Test: After the inspection, the connector should be unplugged and then firmly re-plugged to ensure a proper connection. Following this, the vehicle's ignition system must undergo a key cycle (turning the ignition off and then back on). The technician will then monitor the instrument cluster to determine if the "Turn off engine and check coolant level. See owner's manual" warning light returns.
5. Advanced Diagnosis: If, after completing these steps, the low coolant light warning reappears, the TSB instructs technicians to proceed with further diagnostic procedures outside the immediate scope of this specific bulletin.

Required Tools or Parts

Technicians will need access to the Audi Elsa repair manual for precise coolant level adjustment procedures. The Doc-it system is also required for uploading photographic evidence of the coolant level.

Owner Action

If your 2021-2022 Audi displays the "Turn off engine and check coolant level. See owner's manual" message, even if the coolant appears full, it is recommended to visit an authorized Audi service center. This issue, addressed by Technical Service Bulletin 2061918/5, is typically covered under the vehicle's warranty for up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, it falls under the G10 claim type. If your vehicle is outside of warranty, this TSB serves as informational guidance for diagnosis and repair.

Important Warnings

The TSB emphasizes the importance of confirming that the warning light displayed is specifically the coolant light and not the distance warning light, as these two warnings require different diagnostic and repair approaches.

NHTSA ID: 10250296