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Service bulletin GCUS-3-401

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 id10079725
Published by NHTSA2016-09-12
Manufacturer's numberGCUS-3-401
Manufacturer's date2016-01-13
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION

NHTSA's summary

20710 - CUSTOMER SATISFACTION PROGRAM. VEHICLES EQUIPPED WITH A CONTINUOUSLY VARIABLE RATIO AUTOMATIC TRANSMISSION (CVT) (RPO M4M), MAY HAVE A CONDITION IN WHICH THE DRIVE PULLEY AND BELT COULD BE DAMAGED IF THEY EXPERIENCE AN UNEXPECTED HARSH SHIFT EVENT. DEALERS ARE TO REPROGRAM THE TRANSMISSION CONTROL MODULE (TCM) TO PREVENT DRIVE QUALITY DEGRADATION AND/OR HARSH SHIFTS.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Transmission and driveline, Automatic transmission

Vehicles listed
CHEVROLET SPARK2014, 2015

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

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1308116001F2020-12-07. Service bulletin. The intent of this technical bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.