WenmarOpen by Wenmar Pro

Service bulletin TT 27 18 01

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10149855
Published by NHTSA2018-12-03
Manufacturer's numberTT 27 18 01
Manufacturer's date2018-08-24
NHTSA componentELECTRICAL SYSTEM:12V/24V/48V BATTERY

NHTSA's summary

Update to model year applicability and Battery testing information.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, 12-volt battery

Vehicles listed
VOLKSWAGEN ATLAS2018, 2019
VOLKSWAGEN CC2015, 2016, 2017
VOLKSWAGEN E-GOLF2019
VOLKSWAGEN EGOLF2015, 2016, 2017, 2018
VOLKSWAGEN EOS2015, 2016
VOLKSWAGEN EOS2017
VOLKSWAGEN GOLF2015, 2016, 2017, 2018, 2019
VOLKSWAGEN GOLF R2015 (the catalog's model; the bulletin names a series or trim of it)
VOLKSWAGEN GOLF R2016, 2017, 2018, 2019
VOLKSWAGEN GOLF SPORTWAGEN2015, 2016, 2017, 2018, 2019
VOLKSWAGEN GTI2015
VOLKSWAGEN GTI2016 to 2019
VOLKSWAGEN JETTA2015, 2016, 2017, 2018, 2019
VOLKSWAGEN PASSAT2015, 2016, 2017, 2018, 2019
VOLKSWAGEN TIGUAN2015, 2016, 2017, 2018, 2019
VOLKSWAGEN TOUAREG2015, 2016, 2017

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
V9323082071535_22024-01-04. Service bulletin. Instruction to determine the remaining battery capacity of the high-voltage battery,
MaintenanceA2023-08-21. Service bulletin. Maintenance Schedule For USA
UPDATE23N72023-08-14. Service bulletin. TDI Battery Management Software Update
V2719012011894242023-08-04. Service bulletin. Battery Testing and Charging using Midtronics VAS6161 and or GRX3000 Vas Charger
TT 27 20 02_32023-06-06. Service bulletin. Battery adaptation procedure when battery label is missing.
20419202022-06-13. Service bulletin. Update Programming, DTC(s) Stored in AW C6 High-Voltage Charger including B200000, P31EA00.
V2715032016076112022-04-06. Service bulletin. Discharged Battery, Diagnosis for excessive current draw.
TT 27 20 02_12021-01-08. Service bulletin. Battery Id for testing
TT 27 19 032020-07-07. Service bulletin. Diagnostic for no crank concern.
Circular26N6REV12020-06-04. Service bulletin. Over time and mileage, the factory-installed catalyst may not perform as required. If the effectiveness of the catalyst is reduced, this may result in increased tailpipe emissions and the vehicle could fail an emissions (IM) inspection. Updated claiming instructions to include connecting battery charger. Updated parts return core information in Section E.