19NA090

Service Bulletin
Bulletin No.:
19-NA-090
Date:
May, 2019
INFORMATION
Subject:
Information on Possible Oil Consumption and/or Leaks, Malfunction Indicator
Lamp (MIL) Illuminated - DTC P0300 Set
Brand:
Model:
Buick
Chevrolet
Model Year:
VIN:
from
to
Encore
2013
2019
Cruze
2011
2016
Sonic
2012
2019
Trax
2013
2019
from
to
Engine:
Transmission:
1.4L (LUJ, LUV)
Involved Region or Country
North America, Israel
Condition
Some customers may comment on one or more of the following conditions:
• Oil consumption
• Oil leak
• MIL illuminated
Some technicians may find DTC P0300 (Engine Misfire Detected) set in the Engine
Control Module along with a misfire and low compression in one or more cylinders.
Cause
4576900
This condition may be caused by a broken piston ring land.
Copyright 2019 General Motors LLC. All Rights Reserved.
Page 2
May, 2019
Bulletin No.: 19-NA-090
4576902
Note: If the cylinder wall surface has not been compromised, Do Not replace the engine.
Only replace all four pistons and rings.
Information
Perform an Engine Compression Test to aid in diagnosing a possible concern of oil
consumption/leak from a piston/cylinder. It is recommended that a Cylinder Leakage Test
be performed and record the test results to isolate the concern. If excessive leakage to
the crankcase has been isolated, the pistons and cylinder walls must be inspected for
compromise. Do not replace the engine if marks have been found on the cylinder walls.
Only replace the pistons and rings.
4576914
Shown above is an example of a damaged cylinder wall. Scuffing is wide and has
removed the crosshatch from the cylinder wall. If marks in the cylinder walls could be felt
with the finger nail, engine replacement is recommended.
Version
1
Modified
Released April 30, 2019
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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