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Service bulletin G-206372

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 id10081073
Published by NHTSA2016-09-28
Manufacturer's numberG-206372
Manufacturer's date2014-12-10
NHTSA componentENGINE

NHTSA's summary

14591 - CUSTOMER SATISFACTION. CERTAIN VEHICLES EQUIPPED WITH A 2.0L 4 CYLINDER ENGINE (LTG) MAY HAVE A CONDITION IN WHICH PISTON DAMAGE COULD OCCUR DUE TO AN ENGINE PRE-IGNITION CONDITION. IF THIS CONDITION OCCURS, THE VEHICLE MAY PERFORM POORLY AND OIL CONSUMPTION COULD INCREASE. A WARNING LIGHT MAY ILLUMINATE INDICATING AN ENGINE MISFIRE. IF THIS REPAIR IS NOT COMPLETED BEFORE MULTIPLE PRE-IGNITION EVENTS OCCUR, THE PISTON MAY BE DAMAGED AND THE ENGINE MAY NEED TO BE REBUILT OR REPLACED. DEALERS ARE TO REPROGRAM THE ENGINE CONTROL MODULE (ECM) WITH A REVISED SPARK CONTROL CALIBRATION, INSTALL SPARK PLUGS WITH A COLDER HEAT RANGE (REQUIRED WITH THE NEW CALIBRATION) AND PLACE AN UPDATE TO THE SPARK PLUG PART NUMBER INFORMATION LOCATED IN THE “MAINTENANCE REPLACEMENT PARTS” FOUND IN SECTION 11 OF THE OWNER MANUAL. GM WILL MAIL THE OWNER MANUAL SUPPLEMENT TO CUSTOMERS OF RECORD.

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

Engine

Vehicles listed
CADILLAC ATS2013
CHEVROLET MALIBU2013

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

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