Technical Service Bulletin
45-21-01 – Autonomous Emergency Braking (AEB) (U.S. Only)

Transaction No.: 2062957/5

Condition
Applicable Vehicles
Model(s)

Year

Eng. Code Trans. Code VIN Range From VIN Range To

Golf, GTI

2020-2025

All

All

All

All

Jetta

2019-2025

All

All

All

All

Tiguan LWB

2018-2024

All

All

All

All

Atlas

2018-2025

All

All

All

All

Arteon

2019-2024

All

All

All

All

Atlas Cross Sport

2020-2025

All

All

All

All

ID.4

2021-2025

All

All

All

All

Taos

2022-2025

All

All

All

All

ID.Buzz, Tiguan

2025

All

All

All

All

Revision Table
Instance Number

Published Date

Version Number

Reason For Update

2062957/5

5/01/25

45-21-01

Update to model and model year applicability.

2062957/4

12/18/22

45-21-01

Update to model year applicability.

2062957/3

7/21/22

45-21-01

Update to model year applicability.

2062957/1

7/22/21

45-21-01

Original publication.

Technical Background
The customer reports that the vehicle performed an unwarranted Autonomous Emergency Braking (AEB).
Ensure that the customer is familiar with the various Driver Assist systems and the system limitations via the owner’s manual and videos available
at knowyourvw.com.
Review of the Self Study Programs (SSP 890253 –Driver Assistance Systems, SSP 860193 - Adaptive Cruise Control and Lane Change Assist,
and new model SSPs for specific Driver Assist information for that model), is recommended before performing this TSB.
Participation in the instructor-led training 860292 - Volkswagen Driver Assistance Systems is recommended before performing this TSB.

Production Solution
No current production solutions.

Service
1. Perform preliminary diagnosis
1a. Preliminary Inspection:
Prior to connecting a scan tool, perform the following checks:
•

Perform a vehicle walk around to check for signs of damage or misalignment from previous damage or repair (i.e. bumpers, front grill, front
VW emblem, windshield inc. interior mirror and sensor mounting). Areas of concern should be inspected/repaired and system retested
before continuation of this Technical Bulletin.

•

Check the trailer hitch (on equipped vehicles) for signs of trailer or hitch carrier usage. Use of a trailer or hitch carrier that does not connect
to the vehicle electrical system can cause a change in vehicle ride height. This change can cause a temporary misalignment of the front
radar sensor.

•

Continue to step 1b.

1b. Scan tool diagnosis:
Connect the scan tool and scan the vehicle for any stored fault codes.
•

If any stored faults are found, follow the test plan and perform repairs as necessary. After repairing the concern, retest the vehicle. If the
concern persists, continue to step 2. If the issue is no longer present, return the vehicle to the customer.

•

If no fault codes are stored continue to step 2.

2. Customer Questionnaire
Have the customer complete the attached questionnaire and use the information to determine which of the below scenarios apply.
Customer Concern

System

Diagnostic Step

Occurs at low speed ( Diagnostic capable system -> 0013 Distance control (ACC) -> Technical Product Information.

•

Once the test plan is complete, save the GFF log to the desktop as an .html file.

Gather MVB information (via guided functions):
•

Select O.D.I.S. on the OBD screen.

•

Click on each module one at a time:
‒

AW 13 - Distance Control module/Adaptive Cruise Control
AW 8B - Distance Control Module 2/Adaptive Cruise Control 2 (where equipped)

‒

AW A5 - Front Sensors Driver Assistance System (where equipped)

‒

AW 17 – Instrument Cluster

•

Use the dropdown box just above the module list, select MVB and then green forward arrow.

•

Display all MVB information for that selected module.

•

On the right side menu of O.D.I.S., select "OBD Log".

•

Select "New">"Add">"Display".

•

Repeat for each of the modules available as above.

NOTICE
The data may be used only to provide the customers products and services they request; support their vehicle, products
and services; diagnose, repair and track service and quality issues; communicate with them about their vehicle, products or
services; install and configure changes and updates to their products or services; comply with legal requirements; protect
the safety, property or rights of Volkswagen and the Volkswagen Group family of companies; owners, registered users,
drivers, passengers or others; or prevent and detect fraud or misuse of the vehicles, products or services.

4. Data Evaluation :
Open the saved log and select expand all so all tabs are open. Scroll through the log to locate the Test step: J 428 pro information.

The data should appear similar to the following:

•

Ensure that the current vehicle date/time are correct under Control module data: -J285 - Instrument Cluster Control Module (take note for
later use if incorrect and then set correctly)

•

Using the information under “Control module data:-J428 - Control Module for Adaptive Cruise Control” refer to the attached example and
chart below:
Type of Trigger

Result

Next Steps

No triggers shown

No warning or brake event Refer customer to knowyourvw.com and owner’s manual for system
recorded
operation and limitations.

Only Advance warning trigger(s) stored
on event date(s) given by customer

Only a pre-warning or
warning given

Automatic braking trigger(s) stored on
event date(s) given by customer

Partial and-or full braking Continue to Step 5.
event recorded

Refer customer to knowyourvw.com and owner’s manual for system
operation and limitations. This Technical Bulletin does not apply.

5. Checking Misalignment Angle
•

Check for customer usage of hitch carriers or frequent travel with vehicle loaded (refer to customer questionnaire) as this can affect the
misalignment angle.

•

Check the MVB misalignment angle in AW13. Ensure the angle is within specification (-0.8° to +0.8°). If outside the specifications, perform a
calibration of the -J428 - using vehicle appropriate test plan and retest the system. Refer the customer to the Owner’s Manual and
www.knowyourvw.com for an explanation of the system operation and limitations.

•

If no issues are found with the misalignment angle and no evidence of vehicle hitch use is suspected continue to Step 6.

6. Engineering Review
Necessary information for engineering review:
•

Obtain a photo of the Grill, Emblem, Bumper Cover, windshield mounted camera, and the back of the Radar Sensor, which will show all
printed detail on it.

•

Obtain photos of the -KX2 - Instrument Cluster and of the Radio while the engine is running. The photos should include the vehicle’s
current time and date (with a clock next to it) as well as the mileage.

•

A google maps printout (screenshot of aerial view and street view) of the location noted by the customer with GPS coordinates visible
(make sure the red flag on the map is located on the site noted by the customer).

•

Open a VTA ticket and attach all information gathered:

•

‒

All GFF logs (including -J428 - test plan and all MVBs).

‒

Completed questionnaires filled out by the customer for each event they say occurred.

‒

All required photos (see examples below).

The Helpline Consultant will review the information is complete before requesting engineering review.

Example Pictures :

Front bumper cover

Front grille area

Front emblem

Vehicle time/date

Radar sensor

Forward camera/windshield

Mileage

Google satellite view

Google street view