Malfunction Indicator Lamp (MIL) Illuminated with DTC P0300 – 2016-2018 Buick Chevrolet

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Service Bulletin Bulletin No.: 18-NA-171
Date: July, 2019
TECHNICAL
Subject: Malfunction Indicator Lamp (MIL) Illuminated with DTC P0300
This Bulletin replaces PIP5490D. Please discard PIP5490D.
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Buick Encore
2016
2018 1.4L (LE2)
6T35 Automatic
(MNU) or
6 Speed
Manual (MF3)
Chevrolet
Cruze
Trax 2018
Involved Region or Country North America and N.A. Export Regions
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
If you encounter a vehicle with the above concern,
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.
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.
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.
Page 2 July, 2019 Bulletin No.: 18-NA-171
Causal Part Description Part Number Qty
X Piston, Kit 12688861 4
N/A
Rod Asm-Conn 12688858 4
Retainer, Piston Pin 12639680 4
Bearing Kit, Con Rod 12674806 4
Gasket Kit, Cyl Head (inc bolts) 12687228 1
Filter, Oil 12674698 1
Seal, Cr/Shf Frt Oil 12661527 1
Seal Kit, F/Injrn Fuel Rl 12659782 1
GASKET, TMG CHAIN TENSR 12636523 1
Nut, Turbo 11102751 4
Gasket, Ctltc Conv 12641115 1
Shield, Turbo Ht 12673929 1
Pipe, Fuel Feed Inter 12684046 1
Gasket, Int Manif 12637018 1
Pan, Lwr Oil 12637773 1
Gasket, Cyl Head 12681524 1
Gasket, O/Pump 12644558 1
Gasket, O/Pump 12644557 1
Gasket, Int Manif 12637018 1
Gasket, Wat Otlt 12627061 1
Gasket, Cam Pos Sol 12636176 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 4
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.
Additional Keywords: P0301, P0302, P0303, P0304

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