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April 10, 2015 Service bulletin

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

Chevrolet technical service bulletin PIP4786A for 2007-2011, 2014 Chevrolet Silverado 1500, 2007-2009 Chevrolet Impala and 2007-2015 Chevrolet Tahoe and others.

Bulletin number
PIP4786A
Component
Fuel system, other: storage: tank assembly: pressure relief devices
Summary
This Preliminary Information communication provides information to the technician about vehicles that may have low oil pressure message. Technician may also find a Diagnostic Trouble Code P0521 in the Engine Control Module. Technician should follow all published Service Information diagnosis. When using a scan tool if the oil pressure is low but the oil pressure at the oil filter housing is correct, technician should inspect the Valve Lifter Oil Filter for debris/sludge that could be restricting oil flow to the oil pressure sensor. Technician should remove the Valve Lifter Oil Filter and clean it. If the Valve Lifter Oil Filter cannot be cleaned replace it.

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