A2723502067906_2

Technical Service Bulletin
27 48V Reference: Charging 48V Battery with 12V Charger DTC P0A7D00
27 23 50 2067906/2 March 27, 2023. Supersedes Technical Service Bulletin Group 17 number 22-20 dated
September 13, 2022, for reasons listed below.
Model(s)
Year
All Audi Vehicles 2017 – 2024
VIN Range
Vehicle-Specific Equipment
All
With 48V Battery
Condition
REVISION HISTORY
Revision
Date
Purpose
2
-
Revised Service (added 100A charger recommendation)
1
09/13/2022
Initial publication
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, 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.
Production Solution
Not Applicable
Service
1. Attach an approved 12V charger, with a minimum output of 50 amps continuous (recommended 100A
continuous) to the 12V system of the vehicle.
Page 1 of 3
© 2023 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.
Technical Service Bulletin
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.
Figure 1: Use the steps below to access the test plan.
a.
Right click on Battery Management 2 (0021 – Battery Management 2 (Battery 48V)) (4N0915105D 0206
BMS_48B_Lilon).
b.
Select “Guided Functions”.
c.
Select “0021 – close charging contactor”.
4. Turn the ignition off, wait 10 seconds, then turn the ignition on.
The protection relay closed adaptation value is only read by the 48V battery when the ignition is turned
on.
Page 2 of 3
© 2023 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.
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.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
The following Technical Service Bulletin(s) will be necessary to complete this procedure:
• 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.
Page 3 of 3
© 2023 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.