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Technical Service Bulletin

27 Valeo 48V starter generator (BSG) DTCs POA1A00 P19F800

United States 444 Volkswagen of America, Inc. (6444)

[Status | Released for publishing

Release date Mar 6, 2025

Diagnostic trouble codes

. . . . Fault Storage
Diagnostic address | Diagnostic trouble code
OOCC - Starter . . . .
P19F800: 48-volt vehicle electrical system not available static
0001 - Engine U046900: Invalid Data Received From Starter / Generator .
r static

electronics Control Module

New customer code

Object of complaint Complaint type [Position|
information, navigation, communication, entertainment -> malfunction display functionality ->

symbols -> vehicle electrical system malfunction indicator activates

New workshop code

Object of complaint Complaint type [Position]
power, vehicle electrical system, data transfer -> power supply -> starter functionality -> no

generator function

Vehicle data

Q7 and Q8

Sales types

[;__[ozafa | ozs

[;_[ozafa | foc

aozsfa | fous

[__|aozsfa [| fezss

aoa | foces fF

[Jaozsfa [fous

PR numbers

?:with BGK

Control units

Diagnostic address Software part number Hardware part number
Q0CC - Starter generator|*4MO*.903.028* 0606 *4MO*.903.028* fF
Documents

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Technical Service Bulletin Transaction No.: 2076994/2
27 Valeo 48V starter generator (BSG) DTCs POA1A00 P19F800 Release date: Mar 6, 2025
Condition

REVISION HISTORY

[revision [pate [purpose

2 Revised header (Added additional engine codes.)

Revised Service (Updated wording)

02/25/2025 | Initial publication

Customer states:

Engine warning lamp (MIL) is on (Figure 1).

P= we Tne eA

es 4
| i

Figure 1. MIL is illuminated.

Workshop findings:

The following DTCs are stored paired in their respective modules:

Engine Electronics, J623 (address word 0001):

+ POA1A00: Control module for alternator — Symptom 45888.

AND

Starter Generator, C29 (address word 00CC):

+ P19F800: 48-volt vehicle electrical system not available - Symptom 38806.

Technical Background

The software for the Starter Generator, C29 (address word O0CC) needs to be updated.

Production Solution

New software implemented in production week 07/2025.

Service

This TSB closes PSS 2076029: 27 PSS Valeo 48V Starter Generator (BSG) DTCs POA1A00 + P19F 800.

1. Follow all instructions in TSB 2011732: 00 Software Version Management (SVM), operating instructions.

2. Update the Starter Generator, C29 (address word OOCC) using the SVM action code as listed in the table
below, if necessary:
Old Software Part Hardware Part Old Software New Software SVM Code Input
Number Number Version Version
(or higher)
4M0.903.028 4M0.903.028 0606 0608 CCA005
The software for the starter-alternator control unit must be updated on this vehicle. Please observe the
information and instructions under “Additional Information” regarding this.
Warranty
Replacing parts will not fix the problem. Unjustified work/replacement parts will be charged back. Invoicing under
warranty is not permitted.
Claim Type: + If the vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.
Damage Code: 0039
Labor Operations: Software Update 0151 0010 See SRT with
associated operations
Software Update 0151 0060 Time stated on the
diagnostic protocol
Claim Comment: As per TSB 2076994/2
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 software must be updated on a control unit in this vehicle, or the software must be updated on several control
units in this vehicle to ensure they function correctly in conjunction with the other control units in the vehicle. Please
inform the customer about the software update in question and ask whether they or other third parties have modified
the software (e.g. tuning or retrofitting involving modifications to the vehicle’s software). Please refer the customer to
the Warranty and Maintenance booklet to learn more about how chip tuning can impact warranty coverage. Please
inform the customer that this software update may neutralize previous modifications to the vehicle’s software
performed either by the customer or other third parties.
If the customer declines the software update, please inform them that this could lead to issues or restrictions with
the use of the vehicle or individual components.
Make a note to this effect on the order before it is signed by the customer. Include this information in the customer
file.
All part and service references provided in this TSB (2076029) 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.

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