A2723492058831_6
Service Bulletin Details
Public Details for: A2723492058831_6
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Technical Service Bulletin 27 48V Vehicle electrical system warning, DTC P0CA700 and/or U046900 stored in the starter/generator control module/ECM 27 23 49 2058831/6 March 23, 2023. Supersedes Technical Service Bulletin Group 27 number 22-45 dated September 27, 2022, for reasons listed below. Model(s) Year A6, A7, A8, and Q7 2018 – 2023 S6, S7, S8, R8, and R8 Spyder VIN Range Vehicle-Specific Equipment All 48 V Electrical System 2018 2020 – 2023 RS 7 2018 2021 – 2023 Q8 2019 – 2023 A6 allroad, SQ7, SQ8, and RS Q8 2020 - 2023 A8 e quattro 2020 – 2021 A7 e quattro 2021 – 2022 RS 7 2021 – 2023 R8 GT 2023 Condition REVISION HISTORY Revision Date Purpose 6 - Revised header (updated PR number filter) Revised Condition (updated customer statement) Revised Service (updated diagnosis and service procedure) Revised Warranty (updated claim types and labor operations) 5 09/27/2022 Revised header (Added MY 22 & 23) Revised Condition (Added Symptom Code) Revised Warranty (Updated Damage Codes) 4 03/02/2022 Revised Warranty (Updated Labor Operation) Customer states: • The message “Electrical system: fault. See owner’s manual” is displayed on the instrument cluster. © 2023 Audi of America, Inc. Page 1 of 6 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 • A yellow or red battery warning symbol is displayed on the instrument cluster. Workshop findings: One or more of the following DTC(s) may be stored: Battery management 2 (Battery 48V) control module, J1120 (address word 0021): • DTC P0CA700: Hybrid battery discharge current too high. ECM, J623 (address word 0001), or Gateway, J533 (address word 0019): DTC U046900: Invalid data received from starter/generator control module (Symptom 36564). Technical Background The Belt Starter Generator (BSG), together with the vehicle’s 48V system is an intelligent vehicle system that provides electrical power to the vehicle as needed. Therefore, traditional diagnosis methods, like expecting the alternator to output at full voltage any time the vehicle is running, are no longer viable, as the output power of the BSG is regulated according to the current requirements of the vehicle. For further in depth information, please refer to TSB 2067906: 27 48V Reference: diagnosis and system information. Criterion 1: A software related issue may cause the belt starter generator (BSG) to stop working as intended. Criterion 2: A hardware related issue may cause the belt starter generator (BSG) to stop working as intended. Production Solution Criterion 1: An optimized software has been implemented in current production vehicles. Criterion 2: Not Applicable. Service Check the extended ambient conditions for DTC U046900 Control unit for starter-alternator, implausible signal that is stored in the engine control module, J623 (address word 0001), or the Gateway, J533 (address word 0019). Criterion 1: If the value displayed for Starter generator, actual mode 48V is not shown, or a value other than 5 is displayed (see Figure 1) please check the software version of the BSG (address word 00CC). © 2023 Audi of America, Inc. Page 2 of 6 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 If the software is older than, but not including SW 0527, please update the BSG via the SVM update instructions at the end of this TSB, then follow up with the checks listed under Criterion 2. Figure 1: Extended ambient data in ODIS GFF log. Criterion 2: If the value displayed for Starter generator, actual mode 48V is 5, or otherwise, if the software of the BSG already is at SW 0527 or was updated under Criterion 1, perform the following diagnostic steps to determine if the belt starter generator is the root cause of the customer complaint: 1. Select OBD in ODIS, then select 00CC - Starter Generator >> Measurement Values. 2. Select the following measurement values for display: • [IDE12494]_Voltages • [IDE12495]_Torques • [VO]_operation_mode 3. Disconnect the battery charger from the vehicle, start the engine. The vehicle should idle in park. 4. Determine if the measurement values are within their specified tolerances: [IDE12494]_Voltages Voltage of terminal 87 Values between 11.6V and 15V are normal – If the voltage is below 11.6V, please recharge or replace the 12V battery as required by the appropriate test plan. © 2023 Audi of America, Inc. Page 3 of 6 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 Voltage of terminal 40 Values between 40V and 50V are normal – If the voltage is between 0V and 12V, please check the 48V battery. [IDE12495]_Torques - The specified torque indicates if the BSG is supposed to provide electrical power to the vehicle or not. The engine control module determines if and how much torque the BSG is supposed to generate. - The starter-alternator torque indicates if the BSG is actually producing electrical power when the engine control module requires it to do so. If the BSG is working correctly, both torque levels should be similar (within 5 Nm of each other). If both torque values are 0, attempt to force the vehicle into providing electrical power from the BSG by turning the steering wheel several times to both end stops and back. You can also activate auxiliary system, like the HVAC blower to high, rear window heating, seat heaters to increase the electrical load on the vehicle. [VO]_operation_mode current status of the BSG When assessing the BSG, refer to the following table Specified torque (in Nm) Starter-alternator torque (in Nm) Operation_mode_actual Recommendation 0 0 Standby No charging demand = do not replace belt-driven starter-alternator -6.5 -1 TorqueControlled Belt-driven starteralternator does not charge and needs to be replaced -9.5 0 Inverter fault Belt-driven starteralternator does not charge and needs to be replaced -9.5 -9.5 TorqueControlled Belt-driven starteralternator charging = do not replace © 2023 Audi of America, Inc. Page 4 of 6 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 belt-driven starteralternator -3 -1 TorqueControlled Belt-driven starteralternator charging = do not replace belt-driven starteralternator If this TSB shows the BSG to work within specifications, further vehicle diagnostics is required to determine the root cause of the customer complaint. This however is outside of the scope of this TSB. SVM Update Instructions 1. Follow all instructions in TSB 2011732: 00 Software Version management (SVM), operating instructions. 2. Update the starter/generator control module, C23 (address word 00CC) using the SVM action code as listed in the table below, if necessary: Model Old Hardware Old Hardware Old Software Part Number Version Part Number (or lower) A6, A7, Q7, and Q8 New Software Version SVM Code Input (or higher) 4N0903028 4N0903028 (H, J, M, and N) Old Software Version H17 (F, G, H, J, M, and N) 523 527 CCA001 Warranty Claim Type: • 110 up to 48 Months/50,000 Miles. • G10 for CPO Covered Vehicles – Verify Owner. • 1-GW for vehicles that fall under the Starter-Alternator Limited Warranty Extension. Service Number: Damage Code: Labor Operations: © 2023 Audi of America, Inc. 2726 Software Update: 0039 – if no part is replaced and only the update is required Replace starter-alternator: 0040 Software Update (Includes checking for DTCs) 0151 0000 Only if update required Time stated on the diagnostic protocol (Max 100 TU) Page 5 of 6 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 Diagnostic Time: Check starter-alternator 2726 0199 10 TU Replace starter-alternator (if required according to this TSB) 2726 XXXX See SRT with associated operations GFF – (If no software update was performed) 0150 0000 Time stated on the diagnostic protocol (Max 100 TU) Road test prior to the service procedure No allowance 0 TU Road test after the service procedure No allowance 0 TU As per TSB 2058831/6 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. Additional Information The following Technical Service Bulletin(s) will be necessary to complete this procedure: • TSB 2011732: 00 Software Version Management (SVM), operating instructions. • TSB 2067906: 27 48V Reference: diagnosis and system information All part and service references provided in this TSB (2058831) 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 6 of 6 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.