TT 27 19 01_3

Technical Tip
27-19-01TT - Start/Stop System No Operation, May Also Occur After Battery
Replacement
Transaction No:
2053976/3
Release date:
8/21/2019
Condition
ATTENTION:
THIS IS A TECH TIP, NOT A TECHNICAL BULLETIN.
TECH TIPS ARE NOT ASSOCIATED WITH WARRANTY CLAIMING.
Applicable Vehicles
Model(s)
Year
Eng. Code
Trans. Code
VIN Range From
VIN Range To
Atlas, Atlas
CrossSport,
Tiguan LWB
2018-2020
All
Auto
All
All
Jetta
2019-2020
All
Auto
All
All
Golf, GTI
2019-2020
All
Auto
All
All
Revision Table
Instance Number
Published Date
Version Number
Reason For Update
2053976/3
8/21/20
27-19-01TT
Additional model and model
year applicability.
2053976/2
8/19/19
27-19-01TT
Reinstated.
2053976/1
2/15/19
27-19-01TT
Original publication.
Technical Background
The customer may state that the Start/Stop system is inoperative. Multiple different messages may be displayed in the
MFI or Radio. The concern may be present after a battery replacement or other repair.
Tip:
MFI may display “Error: start–stop”. This might be related to Engine/Motor
Control Module -J623- adaptation.
The customer concern can also be caused by the battery state of charge.
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Technical Tip
27-19-01TT - Start/Stop System No Operation, May Also Occur After Battery
Replacement
Transaction No:
2053976/3
Release date:
8/21/2019
If the charge status of the battery in Data Bus on Board Diagnostic Interface -J533- drops below 12.1 volts, it will
disable the Start/Stop function even if all requirements in the owner manual are met. This may be due to the customer
using several high amperage consumers or frequent short distance driving of the vehicle.
If the charge status of the battery is below 12.1 volts in Data Bus on Board Diagnostic Interface -J533-, the battery will
need to be charged. The vehicle battery may also need to be load tested. After charging and a key cycle, test drive to
see if Start/Stop operates normally.
Another issue that may disable the Start/Stop function is when the battery or Battery Monitoring Control Module -J367has been replaced.
If the vehicle battery or Battery Monitoring Control Module -J367- has been replaced, they must be adapted to the
vehicle. Failure to do so will compromise the operation of the charging system and may lead to premature battery
failure and DTC’s.
The test plan can be found in AW19 Gateway > GF > adapt battery, see figure 1 for additional information.
Service
Tip:
The customer’s concern may also be caused by faults in the Engine/Motor Control Module -J623- or the adaptation for
the Start/Stop system not being activated in the ECM.
If a fault code in the Engine/Motor Control Module -J623- has been repaired, readiness must be set before the
Stop/Start function will work.

First diagnose and repair any faults stored in the Engine/Motor Control Module -J623-.
After a repair (or even if there are were no codes stored):

Adapt the Engine/Motor Control Module -J623-. Go to Engine> Control Module OBD > Adaptations >
Start/Stop Adaptation.
Tip:
In the current status it should indicate "Not Active”.
In the drop box to the right:

Select “Activate” and select Apply.

Cycle ignition Off and then On.
Tip:
With an ignition cycle the message should clear and Start/Stop should be functional. If not, repeat the process and
switch “Not Active” to “Active” twice and complete another ignition cycle.
For Battery or Battery Monitoring Control Module -J367- :

Go to the test plan tab.

Go to select self-test.

Go to Magnifying glass.

Search the word Battery or Battery Monitoring Control Module -J367 (depending on what was replaced).

Attach the test plan.

Perform the test plan you attached, see figure 1 for additional information.
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Technical Tip
27-19-01TT - Start/Stop System No Operation, May Also Occur After Battery
Replacement
Transaction No:
2053976/3
Release date:
8/21/2019
Additional Information
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