A1923382069248_2

Technical Service Bulletin
19 Red Coolant warning lamp comes on OR MIL on, DTC P218100 and/or P1BB400
19 23 38 2069248/2 May 10, 2023. Supersedes Technical Service Bulletin Group 19 number 23-34 dated
January 26, 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
Not Applicable
Condition
REVISION HISTORY
Revision
Date
Purpose
2
-
Revised Service (Updated service instructions)
1
01/26/2023
Initial publication
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 may be stored in the Engine Control Module, -J623- (address word 0001):
• DTC P218100: Cooling System Performance.
• DTC P1BB400: Cylinder head temperature too low.
Technical Background
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
© 2023 Audi of America, Inc.
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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
Replacing the Map Controlled Engine Cooling Thermostat F265 will correct this. Some models will have optimized
software in the Engine Control Module, -J623- (address word 0001), please see the service section for additional
details.
Service
Replace Map Controlled Engine Cooling Thermostat F265.
Please also check that the ball-type non-return 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:
• 110 up to 48 Months/50,000 Miles.
• G10 for CPO Covered Vehicles – Verify Owner.
• If the vehicle is outside any warranty, this Technical Service Bulletin is informational
only
Service Number:
1958
Damage Code:
0010
Diagnostic Time:
Thermostat remove + reinstall
1958 1973
See SRT with
associated
operations.
Check non-return valves
19 86 20 99
20 TU
GFF
0150 0000
Time stated on the
diagnostic protocol
(Max 15 TU)
Road test prior to the service procedure
No allowance
0 TU
Road test after the service procedure
0121 0004
10 TU
As per TSB 2069248/2
Claim Comment:
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
© 2023 Audi of America, Inc.
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
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.
©2023 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.
© 2023 Audi of America, Inc.
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.