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Service bulletin PIP4959D

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 id10112404
Published by NHTSA2017-08-15
Manufacturer's numberPIP4959D
Manufacturer's date2013-10-14
NHTSA componentENGINE AND ENGINE COOLING:COOLING SYSTEM

NHTSA's summary

This Preliminary Information communication provides information to the technician with information regarding high misfire rates always on #1 cylinder. A customer may complain of misfires or roughness on cold start up with a P0300 diagnostic trouble code. Technician is to add coolant dye to the system and run the engine through warm up to circulate the dye. Pressurize the cooling system after a cold soak and inspect the cylinder with a bore scope for coolant dye. Dye is used to identify coolant over residual fuel being that might be left in the cylinder. The technician is not to replace the cylinder head as it will not correct this concern. In some cases it is necessary to remove the head for inspection. Do not replace the engine for small surface pock marks or a pitting appearance this is normal and do not connect to coolant passages. Usually if porosity is present there will be a break in the carbon ring. Only replace the engine if true porosity is found. Technician is to call Product Quality Center with the latest version of bulletin 02-07-30-029 if porosity is found and engine replacement is required.

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

Engine, Cooling system

Trouble codes named

P0300

Vehicles listed
BUICK LACROSSE2012, 2013, 2014
CADILLAC ATS2013, 2014
CADILLAC CTS2012, 2013, 2014
CADILLAC SRX2012, 2013, 2014
CADILLAC XTS2013, 2014
CHEVROLET CAMARO2012, 2013, 2014
CHEVROLET CAPRICE POLICE PURSUIT2012 to 2014
CHEVROLET CAPTIVA2012 to 2014
CHEVROLET EQUINOX2012, 2013, 2014
CHEVROLET IMPALA2012, 2013, 2014
GMC TERRAIN2012, 2013, 2014

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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