Technical Service Bulletin
01-22-03 - Late Production - Update Programming Engine/Motor Control Module -J623-

Transaction No.: 2066602/3

Condition
Applicable Vehicles
Model(s)

Year

Eng. Code

Trans. Code

Jetta

2020 - 2021

1.4T
DGXA

All

VIN Range From VIN Range To
All

All

Revision Table
Instance Number

Published Date

Version Number

Reason For Update

2066602/3

3/10/2025

01-22-03

Updated labor operations.

2066602/2

1/9/2025

01-22-03

To remove original part number
and vendor in warranty table.

2066602/1

3/29/2022

01-22-03

Original publication.

Customer states there is low or no heat output from the air vents under certain cold weather conditions.
This TB also proactively corrects faults listed below.

This software update also includes modification for: P0441, P04F0, P148D, P0496, P060C (37682), P013E, P30DC and
P2421 DTCs.
One or more of the following fault codes may be stored in the Engine Control Module (ECM) Fault Memory:

DTC

Description

P0441

EVAP Emission Contr.Sys.Incorrect Purge Flow

P04F0

EVAP system high pressure purge line performance

P148D

Evaporative Emission System Leak Detection Pump implausible
frequency

P0496

EVAP System High Purge Flow

P060C (37682)

Internal Control Module Main Processor Performance

P013E

O2 Sensor Bank 1 Sensor 2 Delayed Response - Rich to Lean

P30DC

Pressure release for refueling gas tank not possible

P2421 (MAY also require part replacement with ECM flash see below)

Evaporative Emission System Vent Valve Stuck Open

NOTICE
DO NOT diagnose or replace components due to P0441, P04F0, P148D, P0496, P060C (37682), P013E, P30DC and P2421
faults before performing the update function as explained in this bulletin.

Technical Background
Current Engine/Motor Control Module -J623- software can cause low engine heat output or may lead to
various fault codes within the vehicle.

Production Solution
Improved Engine/Motor Control Module -J623- software.

Service
Update-Programming Procedure:

WARNING
Critical Warning: The Midtronics battery charger must be connected to the vehicle battery for the duration of the
programming, to ensure the battery state of charge remains above 12.5 volts during the update process. If the battery
drops below 12.5 volts, the programming could fail which may result in damage to the control module. Control modules
damaged by inadequate voltage will not be covered under the warranty policy. The technician should verify the vehicle
voltage prior to starting the update process, and should monitor the voltage for the duration of the update.
– The procedure may cancel itself if the hazard warning lights are not switched ON. The hazard warning lights prevent the
system from switching to bus sleep mode during the update.
– ODIS-Service tester should be updated to the latest GFF technical version.

CAUTION
Radiator Fan(s) may cycle ON high speed during the Update Process! There is a risk that personal injury may result if
contact is made with spinning fan blades.
– Keep hands and all objects away from Radiator Fan(s) during Update Process!

NOTICE
Prior to launching the ODIS Service diagnostic applications and starting control module update process, confirm tester
screen saver and power settings in accordance with Diagnostic Device Hardware & Windows® - VHW-20-02 Change Power
Options After Windows®10 Upgrade. Failure to do so may result in the tester entering power save mode during data
transfer, and subsequent control module failure. When using a VAS 6150/X or 6160/X tester in conjunction with a VAS 6154
wireless transmitter head for a flash procedure, connect a USB cable between the transmitter head and the tester. Failure
to do so may lead to errors during the flash procedure.
– VAS tools must only be used with their power adapters plugged in. Under no circumstances should they be used on
battery power alone during the programming procedure.

To Update-Programming using Software Version Management (SVM), review and follow instructions in Technical Bulletin
Instance 2014603 “Software Version Management”.
The SVM process must be completed in its entirety so the database receives the update confirmation response. A warranty
claim may not be reimbursed if there is no confirmation response to support the claim or action is carried out that is not
explicitly stated in the Technical Bulletin.

•

Update the Engine Control Module using the SVM Unit code as listed in the table below:

Model

Engine

Old Software Part
No.

Old Software
Version

New Software Part New Software
No.
Version (or
higher)

SVM Unit Code

Jetta

DGXA

04E 906 024 AB

Z842
6946
9944
9970
9971
9972

04E 906 024 AB

9973

48A2

Jetta

DGXA

04E 906 024 BC

946
9970

04E 906 024 BC

9973

48A2

9971
9972
Jetta

DGXA

04E 906 024 BB

7401
9945
9970
9971
9972

04E 906 024 BB

9973

48A2

Jetta

DGXA

04E 906 024 BJ

Z943
Z961
0907
1055
2049

04E 906 024 BJ

2326

48A2

Jetta

DGXA

04E 906 024 BG

Z943
Z961
0905
1057
1520

04E 906 024 BG

2324

48A2

Jetta

DGXA

04E 906 024 BH

Z943
Z961
0906
1056
2048

04E 906 024 BH

2325

48A2

The procedure can be found in GFF under Functions/ Component Selection, Software Version Management, Adapting Software.

The procedure can be found in GFF under Functions/ Component Selection, Software Version Management, Adapting
Software.
Ensure attached ECM/TCM Tuning Form has been completed and signed by customer as required in SVM Technical Bulletin
Instance 2014603.
For VINs setting fault code P2421:
In addition to the software improvement, there is also an improvement to the FTIV (fuel tank isolation valve/tank switch-off valve -N288-) (Figure
1.), which is necessary in preventing erroneous occurrences of the P2421 fault code.
The FTIV / Tank switch-off valve -N288- currently installed on the vehicle must be inspected, to verify whether an improved part has already
been installed. The FTIV / Tank switch-off valve -N288 is mounted to the EVAP canister assembly, as shown below.

Figure 1.

Remove the EVAP canister assembly and inspect the face of the FTIV / Tank switch-off valve -N288. If the part is already updated, it will have a
white paint marking or “02S” printed after the part number, as shown in Figure 2 and Figure 3.
•

If the part has a white paint mark or “02S”, the FTIV / Tank switch-off valve -N288- is already the updated component. In this case DO NOT
replace it, and instead reinstall the EVAP canister assembly. Only the software update will be required.

•

If there is no white paint mark or “02S” are visible on the FTIV / Tank switch-off valve -N288, the component must also be replaced in
addition to the software update. Always refer to ETKA for the most up to date part number information.

Figure 3.

Figure 2.

Warranty
To determine if this procedure is covered under Warranty, always refer to the Warranty Policies and Procedures Manual

1)

Model(s)

Year(s)

Eng. Code(s)

Trans. Code(s)

VIN Range From

VIN Range To

Jetta

2020 - 2021

1.4T
DGXA

All

All

All

SAGA Coding
Claim Type:

Use applicable Claim Type

1)

Service Number:

Damage
Code

HST

Damage Location
(Depends on Service No.)

2470

0039

--

--

Parts Manufacturer

Jetta

3ME 2)

Labor Operation 3) : Charge Battery

27068950 = See Elsa for latest time units.

Labor Operation 3) : Update Programming ECM Control Module

24705599 = 50 TU max.

Labor Operation 3) : Activated charcoal filter rem+reins (Only for vehicle 20251900 = See Elsa for latest time units.
with DTC P2421)
Labor Operation 3) : Replace FTIV / Tank switch-off valve -N288- (Only
for vehicle with DTC P2421)

20711958 = See Elsa for latest time units.

Causal Part:

24705599
Diagnostic Time

4)

GFF Time expenditure

01500060 = Actual GFF print out

NO

Road Test

01210004 = 10 TU

YES

Technical Diagnosis

01320000 = 00 TU max.

NO

Claim Comment: Input “As per Technical Bulletin 2066602” in comment section of Warranty Claim.

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
Part No:

Part Description

Quantity

5Q0201549A PAX
(Only for P2421 if required)

Pressure Regulation Valve (Crystal Gray) / N288-

1

Tool Description

Tool No:

Midtronics Battery Tester/Charger

GRX3000VAS
or
MTRMSP0702 battery maintainer/charger

VAS Diagnostic Tool

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

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.
© 2025 Volkswagen Group 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 Volkswagen Group 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.

OWNER INFORMATION ABOUT CONTROL MODULE TUNING*
ACKNOWLEDGEMENT AND AUTHORIZATION FOR
REPROGRAMMING (REFLASHING) OF CONTROL MODULE(S)
*) “TUNING” is described as the addition of or modification of any component which causes a
Volkswagen vehicle to perform outside the normal parameters and specifications approved by
Volkswagen Group of America / Volkswagen Group Canada.

Date:
Dealer Number:
Vehicle Identification Number:
Repair Order Number:
Dealer stamp

I

, owner or driver of the above identified Volkswagen, confirm:

- “Tuning” as described above (especially power increasing modifications) has NOT been
performed on my vehicle.
- “Tuning” as described above has been performed on my vehicle and the following components
were modified or installed:

TUNING was performed by (Please provide Company name and telephone number, if you wish us
to contact them):

I understand that if my Control Module is determined to have been tuned, any damage caused by
the tuning of the Control Module (including adverse emissions consequences) will not be covered
by VWGoA / VGC warranties.
I am permitting an authorized Volkswagen Dealer to reflash (update) my Control Module, and by
doing so, I understand that this process will automatically overwrite (destroy) and permanently
delete any tuning program that was previously installed on the Control Module of my Volkswagen
vehicle.
By signing below, I fully acknowledge and understand that the tuning program will not be restored
and VWGoA / VGC, will not be liable in any way for the loss of tuning data.

Signature of Customer
E

2025 Volkswagen Group 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
intellectual property
rights of VGoA / VGCA 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
other
and
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.