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Transaction No.: 2080145

Technical Service Bulletin

/1

93-25-05 - High-Voltage Battery: Pre-warning Excessive Temperature DTC
B203400

Condition
Applicable Vehicles
Model(s)

Year

Eng. Code

Trans. Code

VIN Range
From

VIN Range To

ID.4

2021 – 2026

All

All

All

All

ID.Buzz

2025 – 2026

All

All

All

All

Revision Table
Instance Number

Published Date

Version Number

Reason For Update

2080145/1

12/16/2025

93-25-05

Original publication

Customer statement:
•

The customer reports that “Ready” mode cannot be established.

and
•

The following message is displayed in the driver display (see Figure 1):
‒

“High-volt. battery: Risk of fire! Safely park and exit vehicle now. Contact emerg. responders!”

Figure 1. Example of message in driver display

NOTICE
This technical bulletin 2080145/* should also be followed when technical product information 2073038/* is
indicated by a GFF test plan.

Workshop findings:
•

The customer statement can be reproduced.

•

The following diagnostic trouble code (DTC) is stored in the Battery Regulation Control Module -J840(Diagnostic Address 008C):

DTC

Description

Status

B203400

Pre-warning excessive temperature active/static

NOTICE
If this DTC occurs during or immediately following a high-voltage battery repair, then this technical bulletin
does not apply.
– Check that any previously removed wiring harness connectors are fully seated.
– If the problem cannot be found and corrected, then contact VW Group Technical Assistance Center
(TAC) and mention TB 2080145 in the comments.

Technical Background
Potential malfunction in the vehicle high-voltage system.

Production Solution
Not applicable.

Service
Order of steps to follow:
1.

Move vehicle to the quarantine area and readout battery measured values

2.

Hold in quarantine for 5 days with evaluation of battery temperature measured values

3.

After 5-day quarantine period – perform GFF test plan for DTC B203400

DANGER
There is a risk of fatal injury due to high voltage. Electrocution by direct contact or electric arc can cause
severe bodily injury or fatal injury. When working on the high-voltage system and/or high-voltage battery,
the safety precautions and qualification levels given in the repair manual must be observed. Completion of
High-voltage expert (HVE) training is required for working inside the high-voltage battery.

CAUTION

The DTC memory must not be deleted prematurely!
– In steps 1 and 2 below, take care to end the GFF session using the “stop” function (in the data menu)
instead of a normal GFF diagnosis exit!

1. Move vehicle to the quarantine area and readout battery measured values:
•

Park vehicle in a suitable quarantine area for 5 days according to the repair manual:
‒

•

Repair manual > Engine > General Information - High-Voltage > 93 Electric drive > High-Voltage
Vehicles, Handling > Quarantine Concept

Start a GFF diagnosis session with the ODIS tester and proceed as follows:
‒

Read out DTC memory of all control units in the entire vehicle.

‒

Read out all measured value blocks (MVBs) from the high-voltage battery (diagnostic address
008C).

‒

Send the GFF log online.

‒

End the GFF session using the “stop” function only (in the data menu).

CAUTION
If communication with the high-voltage battery is not possible (diagnostic address 008C not identified),
then contact VW Group Technical Assistance Center (TAC) and mention TB 2080145 in the comments.

2. Hold in quarantine for 5 days with evaluation of battery temperature measured values:
•

Two times per day, at least 6 hours between readings:
‒

Read out all measured value blocks (MVBs) from the high-voltage battery (diagnostic address
008C).

‒

Evaluate battery temperature sensor values (cell module temperatures) using criteria noted
below.

‒

Send the GFF log online.

‒

End the GFF session using the “stop” function only (in the data menu).

NOTICE
Criteria for evaluating battery temperature sensor (cell module temperature) values:
– If one or more temperature values increase up to or slightly more than 3°C (Celsius) compared to the
outside ambient air temperature, the vehicle must remain in quarantine, and the temperature values of
the high-voltage battery must be checked regularly.
– If one or more temperature values increase significantly more than 3°C (Celsius) compared to the
outside ambient air temperature, there is an acute risk of fire! In this case, the vehicle must remain in
the quarantine area and the local fire department must be informed.

– If the temperature values remain constant/do not rise compared to the outside ambient air temperature
(+/- 2°C) within the 5-day quarantine period, continue with 3.

3. After 5-day quarantine period – perform GFF test plan for DTC B203400:
•

Start a GFF diagnosis session with the ODIS tester:
‒

Perform the GFF test plan that corresponds to DTC B203400 Pre-warning excessive
temperature.

‒

Perform any resulting work according to additional GFF test plans and/or the repair manual.

NOTICE
GFF test plans corresponding to any additional DTCs present in diagnostic address 008C such as cell
voltage sensing, balancing circuit, or temperature sensing faults may only be performed after the minimum
5-day quarantine period and completion of the GFF test plan corresponding to DTC B203400.
– If the above steps do not resolve the complaint, then contact VW Group Technical Assistance Center
(TAC) and mention TB 2080145 in the comments.

Warranty

To determine if this procedure is covered under Warranty, always refer to the Warranty Policies and
Procedures Manual 1)
Applicable Vehicles
Model(s)

Year

Eng. Code

Trans. Code

VIN Range
From

VIN
Range
To

ID.4

2021 – 2026

All

All

All

All

ID.Buzz

2025 – 2026

All

All

All

All

SAGA Coding
Claim Type:

Use applicable Claim Type 1)

Service Number:
Select case 1 or case 2.
Service Number

Damage Code

HST

Damage Location
(Depends on Service
No.)

Case 1: Ending after
step 3 with no part
replacement.
Case 2: Continuation
after step 3 with part
replacement according
to GFF and/or TAC
case direction

9303

0055

Select according to service number of
causal part

--

--

--

--

Parts Manufacturer:
Select case 1 or case 2.
WWO 2)

2021 – 2024 ID.4
Case 1: Ending after step 3 with no part
replacement.

2025 – 2026 ID.Buzz
VOA 2)

2025 – 2026 ID.4
Case 2: Continuation after step 3 with
part replacement according to GFF and
/or TAC case direction

Select vendor code according to causal part replaced.

Labor Operation 3) : ODIS setup with 12V
battery charger connection

01 50 00 10 = see Elsa for latest time units

Labor Operation 3) : Step 1 – Move to
quarantine and check HV battery

93 03 01 90 = see Elsa for latest time units

If additional work necessary to repair the high-voltage battery is performed according to GFF diagnosis and
/or TAC case direction, then any additional parts and labor operations associated with that work should be
claimed accordingly.
Causal Part:
Select case 1 or case 2.

Case 1: Ending after
step 3 with no part
replacement.
Case 2: Continuation
after step 3 with part
replacement according
to GFF and/or TAC
case direction

Select labor operation
01 50 00 60

Enter causal part according to
diagnostic conclusion.

Diagnostic Time 4)
GFF Time expenditure
Note: To accommodate the instructions
given in step 2, the combined TU total of
multiple GFF logs may be submitted
when this technical bulletin applies.

01 50 00 60 = Actual GFF printout –
500 TU max.

YES

Road Test

01 21 00 02 = see Elsa for latest time
units

NO

01 21 00 04 = see Elsa for latest time
units
Technical Diagnosis

01 32 00 00 = 00 TU max.

NO

Claim Comment: Input DTC B203400 and technical bulletin 2080145 in the claim comments and explain
any additional diagnosis and repair procedures that were performed (if necessary).
1)

Vehicle may be outside any Warranty in which case this Technical Bulletin is informational only.

2)

Code per warranty vendor code policy.

3)

Labor Time Units (TUs) are subject to change with ELSA updates.

4)

Documentation required per Warranty Policies and Procedures Manual.

Required Parts and Tools
No special parts required.

Tool Description

Tool No:

VAS Diagnostic Tool

VAS 6150/X & VAS 6160/X with
ODIS Service with current online updates

VAS Battery Tester / Charger

VAS 5908

Additional Information
All part and service references provided in this Technical Bulletin are subject to change and/or removal.
Always check with your Parts Dept. and Repair Manuals for the latest information.
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