A2723612067906_4

Technical Service Bulletin
27 48V Reference: Charging 48V Battery with 12V Charger DTC P0A7D00
27 23 61 2067906/4 October 23, 2023. Supersedes Technical Service Bulletin Group 27 number 23-60 dated
September 11, 2023 for reasons listed below.
Model(s)
Year
All Audi Vehicles 2017 – 2024
VIN Range
Vehicle-Specific Equipment
All
Not Applicable
Condition
REVISION HISTORY
Revision
Date
Purpose
4
-
Revised Service (updated Notice to Caution)
3
09/11/2023
Revised Technical Background (added SoC info)
Revised Service (added preconditions and notes)
Revised Warranty (added service number/damage code)
2
03/27/2023
Revised Service (added 100A charger recommendation)
Workshop findings:
The 48V battery is in a low voltage protection state and will not accept a charge.
• DTC P0A7D00 Hybrid/EV Battery Pack State of Charge Low.
Technical Background
When the 48V battery falls below a predetermined state of charge (SoC) for any reason, the protection relays
inside the battery open, insuring the internal cells remain above the safe minimum voltage limit.
The protection relays will not close until the appropriate adaption channel is set inside the battery.
As long as the 48V battery has a SoC between 5% and 15%, the battery can be charged via the 12V system
manually by completing the procedure under “Service”.
48V Batteries must not be replaced and instead need to be recharged in such a case. Claims for erroneously
replaced 48V batteries may be debited.
Production Solution
Not applicable.
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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
Service
Preconditions
• The SoC of the 48V battery must be between 5% and 15%
• The SoC of the 12V battery must be between 40% and 60%
• The SoC of the 12V battery can be checked via GFF in the Data Bus On Board Diagnostic Interface control unit -J533(address word 0019)
The 48V battery cannot be charged if the SoC of the 12V battery is above 60%! If necessary, drain the 12V battery
to a SoC between 40% and 60% by switching on the ignition for approx. 20 minutes (longer if necessary).
Procedure
1. Attach an approved 12V charger, with a minimum output of 100 amps continuous to the 12V system of the vehicle.
The negative cable of the 12V charger must not be directly attached to the negative terminal post of the 12V
battery. For the battery management system to read the incoming charge, the negative cable of the battery charger
must be attached to the vehicle chassis, or jump-start ground post.
2. Shut off all non-essential electrical consumers in the vehicle.
3. In ODIS GFF run test plan “0021 – Close charging contactor” (Figure 1) to set the adaptation for protection relay closed,
do not exit the test plan once the adaptation has been set.
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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
Figure 1: Use the steps below to access the test plan.
a. Right click on 0021 - Battery Management 2.
b. Select “Guided Functions”.
c. Select “0021 – close charging contactor”.
4. An automatic ignition cycle should be performed by the test plan. A clicking noise should be audible indicating that the
battery contactors are closed.
The protection relay closed adaptation value and 48V SoC value may only be visible when the ignition is turned on.
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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
The following conditions will cause the 48V battery to clear the adaptation for protection relay closed. Once the adaptation
is cleared, and the 48V battery has not yet sufficiently charged, the protection relay will open and, charging will not be
possible until the adaptation is set again.
• Door Open / Closed Status: Opening or closing a door will clear the adaption.
• Hood Open / Closed Status: Opening or closing the hood will clear the adaption.
• Trunk Open / Closed Status: Opening or closing the trunk will clear the adaption.
• Ignition On / Off Status: Pressing the Start/Stop ignition button will clear the adaptation
• Diagnostic Interface: Removing the Diagnostic Interface from the OBD2 port, or running any additional test plans will
clear the adaptation.
• Key Location: Removing the key from inside the vehicle will clear the adaptation.
Charging the 48V battery takes significantly longer in comparison to charging the 12V battery. Under optimal
conditions, you should plan to have the charger active for a minimum of two hours.
The 48V battery must only be replaced if a DTC regarding a defective Battery or deep discharge (P0B2900) is
stored. Batteries replaced for merely a low charge (between 5% and 15%) may be debited.
Warranty
Please bill using the existing Audi Warranty guidelines.
Use Service number/damage code: 2704/0040
Additional Information
The following Technical Service Bulletin(s) will be necessary to complete this procedure:
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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
• TSB 2067937, 27 48V Reference: Diagnosis and system information.
All part and service references provided in this TSB (2067906) 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 5 of 5
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.