19 HV battery charging is very slow, DTC P31C500 is stored in the high-voltage battery charger
19 21 21 2064025/1 July 16, 2021.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

Audi e-tron
quattro,
Audi e-tron
Sportback

2021

All

Not Applicable

Condition
Customer states:
 Battery charging is very slow.
 After charging for 30 minutes or more the estimated charging time display changes from a normal time to an
excessively long time (for example 36 hours or more when connected to a level 2 charger or DC fast charger).
Workshop findings:
 The customer's concern can be duplicated.
The following DTC may be stored High-voltage battery charger, J1050 (address word 00C6):
 DTC P31C500 (Temperature sensor coolant inlet excessive).

Technical Background
Incorrect calibration of the cooling system control valve in production can result in an excessive temperature in
the cooling system. This can affect the charging speed (among other things).

Production Solution
Improved tolerances and quality checks at the supplier.

Service
If the DTC P31C500 is stored in the high-voltage battery charger, J1050 (address word 00C6) and the workshop
findings specified above also apply, proceed as follows to avoid repeat repairs:
1. Check the vehicle history to determine whether the DTC relating to the coolant valves are stored or have
previously been stored in the thermal management control module, J1024 (address word 00C5).

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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.

If yes, perform the output diagnosis for the specific valve that stored a DTC previously. If the values do
change during output diagnosis test mode replace the corresponding valve according to the Elsa Repair
Manual including bleeding the cooling system.
2. If there is no history of a DTC relating to the coolant valves stored in the thermal management control
module, J1024 (address word 00C5) perform the following:
 Starting with coolant valve 2 (N633) and if necessary continue with coolant valve 4 (N635) and coolant
valve 3 (N634).
 Perform the output diagnosis test for the valves. If the values do change during output diagnosis test
mode replace the corresponding valve according to the Elsa Repair Manual instructions including
bleeding the cooling system.
3. After completing the repair recheck the high-voltage battery and verify that it charges at a normal rate and
that DTC P31C500 has not been set again.

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:

1985

Damage Code:

0040

Labor Operations: Replace coolant valve

Diagnostic Time:

Claim Comment:

9384 19XX

See SRT with
associated
operations

Coolant inspected + added

1938 3550

See SRT with
associated
operations

GFF

0150 0000

Time stated on
the diagnostic
protocol (Max 100
TU)

Road test prior to service procedure

No allowance

0 TU

Road test after service procedure

No allowance

0 TU

As per TSB #2064025/1

Page 2 of 3
© 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.

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. Only
replace the actual valve that is defective.
Part Number

Part Description

Quantity

See ETKA

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

See ETKA/ELSA

4KE963375J

Coolant valve 2 (N633) (Only replace if the valve fails
testing)

01

4KE963375N

Coolant valve 4 (N635) (Only replace if the valve fails
testing)

01

4KE963375H

Coolant valve 3 (N634) (Only replace if the valve fails
testing)

01

Additional Information
All parts and service references provided in this TSB (2064025) are subject to change and/or removal.
©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.

Page 3 of 3
© 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.