Bulletin No.:

Service Bulletin

Date:

18-NA-171
December, 2022

TECHNICAL
Subject:

Malfunction Indicator Lamp (MIL) Illuminated with DTC P0300
This bulletin replaces PIP5490D. Please discard PIP5490D.

Brand:

Model:

Buick

Encore

Chevrolet

Holden

Cruze

Model Year:
from
2016

VIN:
to

from

to

—

—

Engine:

Transmission:

1.4L (LE2)

—

2019

Trax

2018

Astra-K
Hatch HB5

2017

2017

Astra-K
Hatch HB5
and Wagon

2018

2020

Astra
Sedan NB4

2017

2018

Involved Region or Country

North America, Brazil, Chile, Colombia, Israel, Australia/New Zealand

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 Service
Bulletin 16-NA-367.

Copyright 2022 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

December, 2022

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

Causal
Part

Bulletin No.: 18-NA-171
Description

Part
Number

Qty

Gasket, O/Pump

12644558

1

Gasket, O/Pump

12644557

1

Bolt, Eng Mt

11610904

3

Bolt, Eng Mt

11547918

2

Description

Part
Number

Qty

BOLT, ENG MT

11588755

3

Piston, Kit

12705612

4

Bolt, Cr/Shf Balr

11611070

1

Rings, Piston

55588455

4

Rod Asm-Conn

12688858

4

Seal, Turbo Cool
Rtn Pipe

12662185

4

Bearing Kit,
Con Rod

12674806

4

Washer, Turbo Oil
Feed Pipe

12662184

2

Gasket Kit, Cyl
Head (inc bolts)

12709179

1

Gasket, Turbo Oil
Rtn Pipe

12640468

1

Filter, Oil

12706595

1

BOLT, F/INJR

55570735

8

Seal, Cr/Shf
Frt Oil

12661527

1

GASKET, EXH
SYS FRT

23238284

1

Seal Kit, F/Injrn
Fuel Rl

12659782

1

GASKET, EXH
SYS INTER

13453263

1

GASKET, TMG
CHAIN TENSR

12636523

1

GASKET, TURBO
OIL RTN PIPE

12653753

1 (AS
REQUIRED)

Nut, Turbo

11546365

4

Oil

As Required

Gasket,
Ctltc Conv

Refer to 16NA-367

12641115

1

Shield, Turbo Ht

12673929

1

Warranty Information

Pipe, Fuel Feed
Inter

12684046

1

Pan, Lwr Oil

12637773

1

For vehicles repaired under warranty, use the
appropriate labor operation associated with the repair
performed.

N/A

Version

9

Modified

Released May 22, 2018
Revised August 06, 2018 – Added the Encore model and Parts Information section.
Revised February 19, 2019 – Added a Note to the Parts Information section.
Revised July 09, 2019 – Added the Trax model, Parts Information and Additional
Keywords.
Revised August 20, 2019 – Added the 2019 Model Year, updated the Involved Region or
Country section and updated the Parts Information table.
Revised July 08, 2020 – Added Bolt, F/Injr P/N 55570735 to the Parts Information table.
Revised February 05, 2021 – Removed Transmission RPO, updated Involved Region or
Country section and replaced Gasket Kit P/N 12687228 with P/N 12709179 and Oil Filter
P/N 12696048 with P/N 12706595.
Revised April 13, 2021 – Added Holden models and Australia/New Zealand to Involved
Region or Country section.
Revised December 01, 2022 – Updated the Parts Information section.

Additional SI 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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