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Service bulletin Circular26M4REV1

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 id10175944
Published by NHTSA2020-06-04
Manufacturer's numberCircular26M4REV1
Manufacturer's date2020-05-22
NHTSA componentELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL

NHTSA's summary

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.

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, Engine, Exhaust and emissions, 12-volt battery

Vehicles listed
VOLKSWAGEN ATLAS2018

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
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.
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.
VWP-19-032019-07-08. Service bulletin. This Document informs dealers on the new warranty extension of the 12 Volt Battery Warranty Extension for certain Atlas vehicles
TT 01 19 052019-05-06. Service bulletin. Battery disconnect instructions for Atlas.
V271902-20339782019-04-22. Service bulletin. Update to model year applicability. Generator Replacement Charging System inoperative/malfunctions, noise from engine compartment, accessory drive belt damaged or missing.
TT 27 19 012019-04-08. Service bulletin. Start/Stop diagnosis.