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January 30, 2014 Service bulletin

This Preliminary Information communication provides information to the technician about vehicles that have...

Chevrolet technical service bulletin PIP4792D for 2009-2011 Chevrolet Tahoe, 2009-2011 Chevrolet Silverado and 2009-2011 Chevrolet Suburban and others.

Bulletin number
PIP4792D
Component
Engine and engine cooling
Summary
This Preliminary Information communication provides information to the technician about vehicles that have a an extended crank on cold start, brief rough running on cold start, black exhaust color, and/or Service Engine Soon Malfunction Indicator Lamp on. Technician may find a Diagnostic Trouble Code P0172 and or P0175. Technician will need to check the Fuel Alcohol Content parameter found in the Fuel Trim Data List of the scan tool and the measured ethanol content of a fuel sample using the J44175 tester. If the difference is 17% or greater, reprogram the Engine Control Module with the latest calibrations from TIS2web.

Owners of these vehicles have filed 194 complaints in the engine category.

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