NHTSA ID Number: 10161905
Manufacturer Communication Number: 19NA122
TSB/Document Date: 2019-07-01
Summary
This technical bulletin provides a procedure to correct conditions of a rough running engine and MIL Illuminated with DTC P0300.
Service Bulletin
Bulletin No.:
19-NA-122
Date:
June, 2019
TECHNICAL
Subject:
Rough Running Engine, Malfunction Indicator Lamp (MIL) Illuminated - DTC P0300 Set
This Bulletin replaces PIP5421G. Please discard PIP5421G.
Brand:
Model:
Malibu
Model Year:
VIN Breakpoint:
from
to
from
to
2016
2017
SOP
HF214702
Engine:
1.5L (LFV)
Involved Region or Country
North America, Israel
Condition
Some customers may comment on one or more of the following conditions:
• Rough running engine
• MIL illuminated
Some technicians may find DTC P0300 (Engine Misfire Detected) set along with a misfire
low compression in one or more cylinders.
Cause
This condition may be caused by a damaged piston.
Correction
Repair the engine mechanical concern based on the results of the Service Procedure
testing below.
Service Procedure
Important: This bulletin does not apply to 2017
vehicles built with VIN sequence HF214702 and higher
as they have the updated piston assemblies installed.
Repair the engine mechanical concern based on the
results of the Service Procedure below.
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.
1. Perform Engine Compression Testing in SI.
2. If low compression is found, perform Cylinder
Leakage Testing in SI and record the test results to
isolate the concern.
• If excessive leakage to the crankcase is
isolated, check piston and cylinder wall
condition.
• If the cylinder wall surface has not been
compromised, replace all four piston and rod
assemblies.
Copyright 2019 General Motors
LLC. All Rights Reserved.
3. Fill the crankcase with current specification Dexos
oil (Refer to Corporate Bulletin Number
16-NA-367).
4. Check that the vehicle is up to the latest released
calibration available.
⇒ If not, reprogram the engine control
module (ECM).
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 Throttle Body Inspection and Cleaning in SI,
followed by Throttle Body Idle relearn and Air Flow
Compensation Reset function in GDS2.
Page 2
June, 2019
Bulletin No.: 19-NA-122
Examples of pistons with varying levels of
damage:
4576900
4576919
4576895
4576909
Bulletin No.: 19-NA-122
June, 2019
Page 3
Examples of light vertical marks visible on the
cylinder wall:
4573921
4576902
None of the marks in the cylinder walls could be felt
with the fingernail and engine replacement is not
recommended.
Example of a damaged cylinder wall:
4573920
4576914
In this example, the scuffing is wide and has removed
the crosshatch from the cylinder wall in the area above
the arrow.
This would result in oil consumption and requires
engine replacement.
Page 4
June, 2019
Parts Information
Warranty Information
Causal
Part
Description
Part
Number
Qty
X
12674549
4
Bearing Kit
12674806
4
Gasket Kit
12687228
1
Seal, Cr/sft Frt
12661527
1
N/A
Filter
12696048
1
Gasket, O/Pmp
12644557
1
Gasket, O/Pmp
12644558
1
Pan
12637773
1
Pipe, Fuel
12684046
1
Gasket, Manifold
12637018
1
Gasket,
Ctltc Conv
12641115
The correction for this concern may be one of several
repairs described above. For vehicles repaired under
warranty, please use the appropriate warranty Labor
Operation based on the original cause in addition to
well documented straight time.
1
Shield, Heat
12673929
1
Seal, Turbo Cool
12662185
4
Fitting,
Turbo Cool
12676405
12662184
2
Fitting, Turbo Pipe
12685113
1
Gasket, Turbo Oil
12653753
1
Gasket, Turbo Oil
12640468
1
Seal Kit, F/Injn
12659782
1
Seal, F/Pmp
12645181
1
Gasket, Wat Out
12627061
1
Gasket, Therm
12635750
1
Gasket, Exh
23238284
1
Gasket, Exh
22816982
1
Bolt, Cr/Shf
11611070
1
Nut, Turbo
11546365
4
Bolt, Fuel Pmp
11588724
2
Bolt, Eng Mnt
11547918
3
Bolt, Eng Mnt
11588754
3
Oil, Engine
Bulletin No.: 19-NA-122
1
Refer to EPC
Version
1
Modified
Released May 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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TSB/Document ID: 19NA122
Replacement Service Bulletin Number:
MFR Communication Date: 2019-05-30
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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