[Dayze]

I'd alsmost venture to say if it 'just' now happened, and hasn't been a detoriating issue, it could be electrical. Since electrical either works, or doesn't.
Usually 'Bulletins' aren't covered (no cost) once out of warranty. Sounds like you should still be covered?




ENGINE AND ENGINE COOLING:ENGINE

Bulletin Number:
PIP-4990

Bulletin Date:
Dec 2011

Summary:
BUICK/CHEVROLET/GMC/PONTIAC/SATURN: SOME MODEL YEAR VEHICLES MAY EXPERIENCE SERVICE ENGINE SOON (SES) LAMP ILLUMINATED. ISSUE MAY BE CAUSED BY THE CONTROL SOLENOID/MODULE ASSEMBLY OR MAY HAVE DAMAGED OR POOR TERMINALS FOR UNDER HOOD FUSE ( NHTSA ITEM NUMBER - 10043320 )




Nature of Defect:
ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL

Bulletin Number:
SB-11195

Bulletin Date:
Jun 2011

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Summary:
GM: 2011 LACROSSE, EQUINOX, TERRAIN. THE MALFUNCTION LIGHT WILL COME ON ALONG WITH, ROUGH IDLE, POOR DRIVEABILITY, AND/OR POSSIBLE STALLING AT LOW THROTTLE OPENING. THIS IS DUE TO A PROBLEM WITH THE CAMSHAFT. ( NHTSA ITEM NUMBER - 10040502 )





Nature of Defect:
ENGINE AND ENGINE COOLING:ENGINE

Bulletin Number:
PI-0090B

Bulletin Date:
Mar 2011

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Summary:
GM: THERE MAY BE AN INTERMITTENT ENGINE HESITATION OR FLUTTER. THE CAMSHAFT SENSOR TERMINALS LIKELY HAVE POOR CONNECTIONS. ( NHTSA ITEM NUMBER - 10038345 )




Some Service Bulletins


Nature of Defect:
POWER TRAIN:AUTOMATIC TRANSMISSION

Bulletin Number:
PI-0376

Bulletin Date:
Feb 2011

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Summary:
GM: THE MALFUNCTION INDICATOR LIGHT IS ON AND THE TRANSMISSION MAY SLIP DUE TO DEBRIS ENTERING THE CHANNEL PLATE. ( NHTSA ITEM NUMBER - 10038465