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Service bulletin PI1540

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 id10126379
Published by NHTSA2017-12-22
Manufacturer's numberPI1540
Manufacturer's date2015-10-19
NHTSA componentELECTRICAL SYSTEM:SOFTWARE

NHTSA's summary

This preliminary informational bulletin provides diagnostic and repair information to correct a customer concern in which certain vehicles equipped with Gen 7 and OnStar, a recent over-the-air service update may have caused the OnStar system to become inoperative.

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, Software

Vehicles listed
BUICK LACROSSE2007, 2008, 2009, 2010, 2011
BUICK LUCERNE2007, 2008, 2009, 2010, 2011
BUICK TERRAZA2007
BUICK TERRAZA2008
CADILLAC DTS2007, 2008, 2009, 2010, 2011
CHEVROLET AVEO2009, 2010, 2011
CHEVROLET COLORADO2007, 2008, 2009, 2010, 2011
CHEVROLET IMPALA2007, 2008, 2009, 2010, 2011
CHEVROLET MALIBU2007, 2008, 2009, 2010, 2011
CHEVROLET TRAILBLAZER2007, 2008, 2009
CHEVROLET UPLANDER2007, 2008, 2009
GMC CANYON2007, 2008, 2009, 2010, 2011
HUMMER H22007, 2008, 2009, 2010
HUMMER H32007, 2008, 2009, 2010
PONTIAC G62007, 2008, 2009, 2010
PONTIAC GRAND PRIX2007, 2008
PONTIAC MONTANA2007 to 2009
SAAB 9-32009
SAAB 9-52009, 2010
SATURN AURA2007, 2008, 2009, 2010
SATURN RELAY2007
SATURN RELAY2008

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
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PIC5687C2023-12-11. Service bulletin. Checking Smartphone Bluetooth Software Update Status
PIC5677A2023-12-11. Service bulletin. Timeshift Function Inoperative.
130089004H2023-12-11. Service bulletin. Car and Truck Fix it Right the First Time Issues
1300890032023-12-11. Service bulletin. Vehicle Software Enhancements
PIP5632G2023-01-30. Service bulletin. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
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19-NA-2622022-08-03. Service bulletin. This technical bulletin provides repair information to correct a customer concern of Clock Shows Dashes and Cannot be Set After Battery Disconnect.
PI11522021-04-28. Service bulletin. HVAC Stuck in Defrost Mode, DTCs B0248, B0268 or B0408 Set Condition/Concern Some customers may comment that the HVAC system is stuck in the defrost mode. When checking the vehicle for DTCs, the HVAC control module may report B0248, B0268 or B0408 set as current. Once the DTC(s) are cleared, the air delivery mode can be changed. This condition may be due to an actuator over-traveling or intermittently binding, causing the DTC(s) to set.