18NA171

Bulletin No.:
Service Bulletin
18-NA-171
Date:
August, 2019
TECHNICAL
Subject:
Malfunction Indicator Lamp (MIL) Illuminated with DTC P0300
This Bulletin replaces PIP5490D. Please discard PIP5490D.
Brand:
Model:
Buick
Encore
Chevrolet
Cruze
Trax
Model Year:
from
2016
VIN:
to
from
2019
2018
to
Engine:
Transmission:
1.4L (LE2)
6T35 Automatic
(MNU) or
6 Speed
Manual (MF3)
Involved Region or Country
North America, Israel, South America
Condition
Some customers may comment on a rough running engine with the Malfunction Indicator
Lamp (MIL) Illuminated.
Upon inspection, a technician may find DTC P0300 (Engine Misfire Detected) set in the
Engine Control Module (ECM) along with a misfire and low compression in one or more
cylinders.
Cause
This condition may be caused by a damaged piston requiring replacement.
Correction
Repair the engine mechanical concern based on the results of the Service Procedure
below.
Service Procedure
Perform an engine compression test. Refer to Engine
Compression Test in SI.
• If low compression is found, perform a cylinder
leakage test. Refer to Cylinder Leakage Test in SI
and record the test results to isolate the concern.
Note: To isolate the source of cylinder leakage to a
valve or cylinder sealing issue, it may be necessary to
remove the intake and exhaust manifolds.
•
If excessive leakage to the crankcase is isolated,
check all four cylinder walls for damage. If the
cylinder wall surfaces have not been damaged,
replace all four pistons and fill the crankcase with
current specification Dexos oil. Refer to Bulletin
Number 16-NA-367.
Copyright 2019 General Motors LLC. All Rights Reserved.
An un-metered air leak in the induction system, or an
engine mechanical issue causing rough running, may
cause the ECM to learn an incorrect Throttle Body Idle
Airflow Compensation value over time. This incorrectly
learned value may cause various symptoms to occur
such as MIL on with P1101 setting, rough or unstable
idle speeds and/or engine stall.
Once the mechanical repairs have been completed,
perform a throttle body inspection and cleaning. Refer
to Throttle Body Inspection and Cleaning in SI, followed
by Throttle Body Idle Air Flow Compensation Reset
function in GDS2.
Note: For the Cruze vehicles only – A calibration has
been released that will help to reduce the possibility of
a cracked piston. Update the engine control module to
the latest calibration available.
Page 2
August, 2019
Bulletin No.: 18-NA-171
Parts Information
Note: The piston and rod assembly referenced in this
bulletin arrives with rod bolts that are allowed to be
removed and reused one time for final assembly to the
complete repair.
Causal Part
X
N/A
Description
Part Number
Qty
Piston, Kit
12705612
4
Rings, Piston
55588455
4
Rod Asm-Conn
12688858
4
Bearing Kit, Con Rod
12674806
4
Gasket Kit, Cyl Head (inc bolts)
12687228
1
Filter, Oil
12696048
1
Seal, Cr/Shf Frt Oil
12661527
1
Seal Kit, F/Injrn Fuel Rl
12659782
1
GASKET, TMG CHAIN TENSR
12636523
1
Nut, Turbo
11546365
4
Gasket, Ctltc Conv
12641115
1
Shield, Turbo Ht
12673929
1
Pipe, Fuel Feed Inter
12684046
1
Pan, Lwr Oil
12637773
1
Gasket, O/Pump
12644558
1
Gasket, O/Pump
12644557
1
Bolt, Eng Mt
11610904
3
Bolt, Eng Mt
11547918
2
Bolt, Cr/Shf Balr
11611070
1
Seal, Turbo Cool Rtn Pipe
12662185
4
Washer, Turbo Oil Feed Pipe
12662184
2
Gasket, Turbo Oil Rtn Pipe
12640468
1
Warranty Information
For vehicles repaired under warranty, use the
appropriate labor operation associated with the repair
performed.
Version
5
Modified
Released May 22, 2018
August 06, 2018 – Added the Encore model and Parts Information section.
February 19, 2019 – Added a Note to the Parts Information section.
July 09, 2019 – Added the Trax model, Parts Information and Additional Keywords.
August 20, 2019 – Added the 2019 Model Year, updated the Involved Region or Country
section and updated the Parts Information table.
Additional Keywords: P0301, P0302, P0303, P0304
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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