19 Red coolant warning lamp on, DTCs P218100, P017B00, P017C00, and/or P017E00 are stored in the
ECM
19 21 16 2062951/1 May 3, 2021.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

RS 6 Avant,
RS 7

2021

900001 - 901935

V8 TFSI

Q7, Q8,
SQ8, SQ7,
and RS Q8

2020

All

V8 TFSI

Q7, SQ7

2021

000001 - 015609

V8 TFSI

Q8, SQ8

2021

000001 - 010457

V8 TFSI

RS Q8

2021

000001 - 011352

V8 TFSI

A8, S8

2019 - 2020

All

V8 TFSI

A8

2021

000001 – 007769

V8 TFSI

S8

2021

000001 - 005379

V8 TFSI

Condition
Customer states:
 Red coolant warning lamp is illuminated in the instrument cluster.
Workshop findings:
The following DTCs may be stored in the engine control module (ECM), J623 (address word 0001):
 DTC P218100 (Malfunction in cooling system).
 DTC P017B00 (Cylinder head temperature sensor implausible signal).
 DTC P017C00 (Cylinder head temperature sensor short circuit to ground).
 DTC P017E00 (Cylinder head temperature sensor open circuit/loose contact).

Technical Background
Damage to the O-ring of the temperature sensor can cause water intrusion inside the plastic housing of the
coolant temperature sender G407 (cylinder head temperature sensor). The moisture can damage the sensor
element. The loss of function can be sporadic.

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© 2021 Audi of America, Inc.
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.

Production Solution
Improved part in production.

Service
1. Work through Guided Fault Finding.
2. It is very important to also check whether the O-ring
located directly on the tip of the coolant temperature
sender G407 is visibly damaged and/or pinched (Figure
1).

Figure 1. O-ring is pinched.
3. Replace the G407 if it is damaged and/or pinched.

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.

Page 2 of 4
© 2021 Audi of America, Inc.
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.

Service Number:

1978

Damage Code:

0040

Labor Operations:

Remove and install temperature sender

1978 19XX

See SRT with
associated
operations

Diagnostic Time:

GFF

0150 0000

Time stated on
the diagnostic
protocol (Max 20
TU)

Road test prior to the service procedure

0121 0002

10 TU

Road test after the service procedure

0121 0004

10 TU

Claim Comment:

As per TSB #2062951/1

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
Always check with your Parts Department and/or ETKA for the latest information and parts bulletins.
Part Number

Part Description

Quantity

See ETKA

Fasteners, Bolts, Nuts, and Screws as needed per the
Repair Manual

See ETKA/ELSA

See ETKA

Coolant temperature sender G407

01

Tool Number

Tool Description

VAS 6160/VAS 6150

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

Additional Information
All parts and service references provided in this TSB (2062951) are subject to change and/or removal.
©2021 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

Page 3 of 4
© 2021 Audi of America, Inc.
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.

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.

Page 4 of 4
© 2021 Audi of America, Inc.
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.