2023-2024 Audi e-tron Cooling System Fault TSB

Owners of 2023-2024 Audi e-tron, Q8, and SQ8 vehicles may encounter instrument cluster messages indicating an Audi e-tron cooling system fault. This issue is detailed in Audi Technical Service Bulletin (TSB) 2072715/1, issued on January 23, 2024, which provides diagnostic and repair procedures for technicians.

Symptoms

Drivers may observe one of two primary scenarios on their instrument cluster:

• Scenario 1: The message "Electric drive: fault. Cooling system. Please contact workshop." appears, accompanied by a yellow drive system indicator lamp.
• Scenario 2: The message "Switch off engine and check coolant level. See owner's manual." is displayed, along with a red drive system warning lamp.

Fault Codes / DTCs

When diagnosing an Audi e-tron cooling system fault, technicians may find several diagnostic trouble codes (DTCs) logged in the thermal management control unit (diagnostic address 00C5). These codes can be static or intermittent:

Code	Description
B16A284	Refrigerant pressure for cooling interior compartment, signal too low
B16A285	Refrigerant pressure for cooling interior compartment, signal too high
B16A384	Refrigerant pressure for heating interior compartment, signal too low
B16A385	Refrigerant pressure for heating interior compartment, signal too high
P053400	A/C Refrigerant Charge Loss
P0CE900	Hybrid/EV Electronics Coolant Pump Control Circuit/Open
P139B00	Engine Coolant Level Sensor, low coolant level
P2B2A00	Hybrid/EV Electronics Coolant Pump Dry Run

Important Warnings

Audi emphasizes specific conditions for this repair:

• Repair Criteria: The repair described in TSB 2072715/1 should only be performed if all specified criteria (model/type, chassis number, engine/motor and gearbox code, PR numbers, part numbers, software versions, etc.) are met. Failing to adhere to these criteria may not resolve the problem, lead to repeat repairs, and could result in warranty claim rejection and re-debiting of parts.
• High-Voltage System Safety: The high-voltage system in these vehicles poses a risk of fatal injury. Technicians must observe and follow all safety information in the Audi Workshop Manual when working on the high-voltage system to prevent severe or fatal injuries from electric shock.

Repair Procedure Summary

The resolution for the Audi e-tron cooling system fault involves replacing a specific coolant hose. Before beginning any work, the coolant hose with part number 4KE 998 465 D must be ordered. The repair process requires removing and installing the rear cover and then replacing the coolant hose for the high-voltage battery. All steps must be performed according to the detailed instructions provided in the Audi Workshop Manual and any additional instructions attached to the TSB.

Required Tools or Parts

• Coolant Hose: Part number 4KE 998 465 D

Warranty Information

This Technical Service Bulletin outlines the warranty coverage for the repair:

• Standard Warranty: The repair is covered for up to 48 months or 50,000 miles.
• Certified Pre-Owned (CPO) Vehicles: For CPO vehicles, claim type G10 applies, and owner verification is required.
• Out of Warranty: If the vehicle is outside of any applicable warranty, this TSB serves as informational guidance only, and repair costs may not be covered.

Owner Action

If your Audi e-tron, Q8, or SQ8 displays any of the described cooling system warnings or you suspect an Audi e-tron cooling system fault, it is recommended to contact an authorized Audi service center. Provide them with the exact warning messages and any observed symptoms. They can diagnose the issue using TSB 2072715/1 and perform the necessary repairs.

NHTSA ID: 10249232