2021 Audi Models: Coolant Warning Light On, Level Appears Normal TSB

Owners of certain 2021 Audi models may experience a perplexing issue: the low coolant warning lamp illuminates in the instrument cluster, even though a visual check of the coolant expansion tank shows the level to be between the minimum and maximum marks. This condition, where the Audi coolant warning light appears despite a normal coolant level, is detailed in Technical Service Bulletin (TSB) 2061918/1.

Symptoms

The primary symptom reported by owners is the illumination of the coolant warning lamp in the instrument cluster. Upon inspection, technicians confirm that the coolant level in the expansion tank is within the normal operating range.

Technical Background

Audi explains that the large capacity of the coolant circuit can lead to significant fluctuations in coolant level as the engine cools down and heats up. If the coolant circuit was not correctly filled or bled during manufacturing or previous service, these fluctuations can sporadically trigger the low Audi coolant warning light.

Diagnosis and Repair Procedure Summary

To address the concern of the Audi coolant warning light appearing with a normal level, technicians are instructed to follow a specific diagnostic and repair process:

1. Coolant Level Adjustment: The coolant level in the expansion tank must be checked and adjusted under cold conditions, following the guidelines in the Elsa repair manual.
2. Connector Inspection: A thorough inspection of the electrical connector, including its pins and contacts, is required. This check ensures there are no loose connections or damage.
3. Contact Surface Integrity: The contact surfaces of the pins and connector contacts must be verified to be free of any impurities or damage that could interfere with the electrical signal.
4. Key Cycle Test: After disconnecting and reconnecting the connector, a key cycle should be performed. The vehicle is then monitored to see if the concern returns. If the low coolant light reappears, further diagnosis beyond the scope of this TSB is necessary.

Owner Action

If you own a 2021 Audi model and are experiencing the coolant warning lamp illuminating despite a normal coolant level, it is recommended to schedule an appointment with an authorized Audi service center. This issue is covered under warranty for up to 48 months or 50,000 miles, and for Certified Pre-Owned (CPO) vehicles, provided the warranty is active. The diagnostic and repair procedures outlined in TSB 2061918/1 are designed to accurately identify and resolve the root cause of the sporadic warning.

Source: NHTSA ID: 10186510