Technical Service Bulletin
19 Red coolant warning lamp comes on OR MIL on, DTC P218100 and/or P1BB400
19 24 64 2069248/6 August 30, 2024. Supersedes Technical Service Bulletin Group 19 number 23-43 dated
September 14, 2023 for reasons listed below.
Model(s)

Year

A8

2019 – 2021

S8

2020 – 2021

SQ7, SQ8, and
RS Q8

2020 – 2022

RS 6 Avant, and
RS 7

2021 – 2022

VIN Range

Vehicle-Specific Equipment

All

4.0L engine

Condition
REVISION HISTORY
Revision

Date

Purpose

6

-

Revised Warranty (Updated Warranty table)

5

09/14/2023

Revised Warranty (Updated Warranty table)

4

09/07/2023

Revised Condition (Updated workshop findings)

Customer states:
•

The red coolant temperature warning is displayed in the instrument cluster and the engine fans are running.
However, according to the coolant temperature gauge, the engine temperature is not excessively high.

Or
•

MIL on.

Workshop findings:
The following DTCs are stored in the Engine Control Module, -J623- (address word 0001):
•

DTC P218100: Cooling System Performance. (Must be stored.)

•

DTC P1BB400: Cylinder head temperature too low. (May also be present.)

If DTCs P017B00, P017C00 or P017E00 are also stored in the ECM, please refer to TSB 2062951.

© 2024 Audi of America, Inc.
Internal

Page 1 of 3

All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies, and its licensors. All rights are reserved to make changes at any time without notice. No part of this
document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may
these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Service Bulletin
Technical Background 1
In some instances, corrosion between the brass bushing and the heating pin leads to inaccurate open and close
positions during the operating temperature range. The surface treatment process of the thermostat sleeve has
been improved to minimize corrosion.

Production Solution
Not applicable.

Service
Replace Map Controlled Engine Cooling Thermostat F265.
Please also check that the ball-type non-return valves (check valves) in the two quick-release couplings for the
coolant breather line which connects the engine and the main radiator to the coolant expansion tank are present
and are working correctly. To ensure correct functioning, the balls must be able to move freely, and the valves
must open in the normal direction of flow toward the expansion tank but close toward the engine/main radiator
(refer to “Connection diagram – coolant lines” in ELSA).

Warranty
Claim Type:

If the vehicle is outside any warranty, this Technical Service Bulletin is
informational only

Service Number:

1958

Damage Code:

0010

Labor Operations:

Thermostat remove + reinstall

1958 1973

See SRT with
associated
operations.

Check non-return valves

1986 2099

20 TU

GFF

0150 0000

Labor according to
diagnostic log

Charge battery

2706 8950

See SRT with
associated
operations

Road test after the service procedure

0121 0004

10 TU

Claim Comment:

As per TSB 2069248/6

© 2024 Audi of America, Inc.
Internal

Page 2 of 3

All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies, and its licensors. All rights are reserved to make changes at any time without notice. No part of this
document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may
these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Service Bulletin
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.

Required Parts and Tools
Tool Number

Tool Description

VAS 6160/VAS 6150

VAS tester with the current version of ODIS (Windows 10).

Additional Information
All part and service references provided in this TSB (2069248) are subject to change and/or removal. Always
check with your Parts Department, and/or ETKA for the latest information and parts bulletins. Please check the
Repair Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.
©2024 Audi of America, Inc. All rights reserved. The information contained in this document is based on the
latest information available at the time of printing and is subject to the copyright and other intellectual property
rights of Audi of America, Inc., its affiliated companies, and its licensors. All rights are reserved to make changes
at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may
these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

© 2024 Audi of America, Inc.
Internal

Page 3 of 3

All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies, and its licensors. All rights are reserved to make changes at any time without notice. No part of this
document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may
these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.