2021 Audi Low Coolant Light Warning TSB

Symptoms

Owners of affected Audi vehicles may observe the following symptom:

• "The coolant warning light appears in the instrument cluster."

Despite this warning, workshop findings indicate that when the coolant expansion tank is visually checked, the coolant level is typically found to be between the minimum and maximum marks, as it should be.

Why This Happens

This condition, where the Audi low coolant light illuminates despite a normal coolant level, is attributed to the large capacity of the coolant circuit. This large capacity can lead to significant fluctuations in the coolant level as the engine heats up and cools down. If the coolant circuit was not correctly filled or bled during manufacturing or previous service, these fluctuations can sporadically trigger the low coolant level warning light.

What the Dealer Will Do

To diagnose and address the persistent Audi low coolant light warning, Audi technicians will follow a specific procedure:

1. Coolant Level Check: The coolant level in the expansion tank will be checked and set according to the Elsa repair manual, ensuring the engine is cold during this process.
2. Connector Inspection: The electrical connector for the coolant level sensor, including its pins and contacts, will be carefully inspected for any issues.
3. Contact Surface Check: Technicians will ensure that the contact surfaces of the pins and the connector are free of dirt and are not damaged.
4. Connector Re-seating and Key Cycle: The connector will be unplugged and then re-plugged. A key cycle will then be performed to reset the system. If the warning light reappears after these steps, further diagnosis outside the scope of this TSB will be performed.

Warranty Information

This Technical Service Bulletin (TSB 2061918/3) outlines warranty coverage for eligible vehicles:

• Claim Type: 110, applicable for vehicles up to 48 months or 50,000 miles.
• CPO Vehicles: G10 for Certified Pre-Owned (CPO) vehicles, requiring owner verification.
• Out of Warranty: If your vehicle is outside of these warranty parameters, this Technical Service Bulletin is informational only, meaning any repairs may not be covered.

Service Number: 1940 Damage Code: 0040 Labor Operations: Checking the coolant expansion tank (1940 0199) is allotted 30 labor time units (TU). Diagnostic time (GFF) and road test procedures are listed with no allowance.

This TSB, identified as 19 21 19 2061918/3 and dated June 30, 2021, supersedes Technical Service Bulletin Group 19 number 21-12, dated March 2, 2021.