NHTSA ID Number: 10165111
Manufacturer Communication Number: 19NA180
TSB/Document Date: 2019-09-23
Summary
This New Engine Features Bulletin provides General Information to help the Service Personnel become familiar with the Duramax Diesel 3.0L - RPO LM2.
carbon, before the measurement phase begins. The
amount of regenerations is based on vehicle strategy.
When the calibrated amount of regenerations are
reached, the cumulative current readings are used to
determine the amount of soot concentration in the
exhaust gas, indicating the collection efficiency of
the DPF.
Page 10
September, 2019
Bulletin No.: 19-NA-180
Fuel System
Fuel System Component List
5166331
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Fuel Filter Assembly
B47 Fuel Pressure Sensor
B47B Fuel Rail Pressure Sensor
Q18B Fuel Pressure Regulator 2
Q17 Fuel Injector
G18 High Pressure Fuel Pump
Q18A Fuel Pressure Regulator 1
Q18C Fuel Pressure Regulator 3
E12 Glow Plug
K34 Glow Plug Control Module
K20 Engine Control Module
A7 Fuel Pump and Level Sensor Assembly
Fuel Cooler
Fuel Tank
The primary fuel tank stores the fuel supply and
contains a 3–phase electric fuel pump that is controlled
by the fuel pump driver control module and ECM. Fuel
is pumped from the primary fuel tank through the fuel
feed line to the fuel filter assembly. The fuel filter
assembly consists of a fuel filter/water separator, fuel
heater, fuel temperature sensor, and a water in fuel
sensor. Fuel flows out of the fuel filter assembly through
the rear fuel feed pipe and past the fuel pressure
sensor to the high pressure fuel pump. High pressure
fuel is supplied through the high pressure fuel line to
the fuel rail and then through the fuel injector lines to
the fuel injectors. High pressure fuel is controlled by the
ECM, fuel pressure regulators 1, 2, and 3. Excess fuel
returns to the fuel tank through the fuel return pipes.
Fuel Cooler
The fuel cooler is located under the vehicle. The
returning fuel goes through the fuel cooler prior to
reaching the vehicle’s fuel tank. Coolant from the
engines cooling system flows through the fuel cooler in
order to cool the fuel and maintain a constant fuel
temperature.
Fuel Feed and Return Pipes
The fuel feed pipe carries fuel from the fuel tank to the
fuel filter/heater, the exhaust aftertreatment fuel
injector, and fuel injection pump. The fuel return pipe
carries fuel from the fuel rail assemblies back to the
fuel tank.
Bulletin No.: 19-NA-180
September, 2019
Page 11
Fuel Injectors
A fuel injector is a solenoid device, controlled by the
ECM, that meters pressurized fuel to a single engine
cylinder. Fuel from the fuel injector tip is sprayed
directly into the combustion chamber on the
compression stroke of the engine. The fuel injectors are
located above each cylinder and deliver fuel directly
into the cylinder. Each injector has a high pressure fuel
pipe from the fuel rail and a return line.
High Pressure Fuel Pump
The high pressure fuel pump is a mechanical pump and
is attached to the lower driver side of the engine block
.
The high pressure fuel pumps provides high pressure
fuel to the fuel rail at a specified pressure regulated by
the fuel pressure regulators.
Fuel Injection Timing
The ECM has the ability to learn injector timing
performance. When the engine is at operating
temperature, throttle closed and in deceleration fuel
cut-off mode, the ECM will pulse each injector
individually and measure the changes in rotational
speed of the crankshaft using the input from the
crankshaft position sensor. The ECM will run this
diagnostic at one fuel rail pressure operating point for
each injector. The ECM stores the injector timing value.
Overview
A turbocharger increases engine power by pumping
compressed air into the combustion chambers, allowing
a greater quantity of fuel to combust at the optimal air/
fuel ratio. The Variable Geometry Turbine (VGT) body
assembly contains a contact-less inductive VGT
position sensing element that is managed by a
customized integrated circuit. The VGT position sensor
is mounted within the VGT body assembly and is not
serviceable. The ECM supplies the VGT body with a
5 V reference circuit, a low reference circuit, an
H-bridge motor directional control circuit, and an
asynchronous signal/serial data circuit. The
asynchronous signal means communication is only
going from the VGT body to the ECM. The VGT body
cannot receive data from the ECM over the signal/serial
data circuit. The VGT position sensor provides a signal
voltage that changes relative to VGT vanes angle. The
customized integrated circuit translates the voltage
based position information into serial data using Single
Edge Nibble Transmission (SENT) protocol. The VGT
position sensor information is transmitted between the
VGT body and the ECM on the signal/serial data circuit.
The ECM decodes the serial data signal and is used as
voltages for VGT position sensor.
The turbocharger vanes are normally closed at idle,
greater than 70%, when the engine is not under load.
As the vehicle accelerates and the torque request
stabilizes, the ECM will open the turbocharger vanes to
regulate boost pressure.
The ECM will close the turbocharger vanes to create
back pressure to drive exhaust gas through the EGR
valve as required. At extreme cold ambient
temperatures, the ECM may maintain a more closed
vane position, at low load conditions, in order to
accelerate engine coolant heating.
Fuel Pressure Regulator 1 & 3
The ECM controls the fuel rail pressure using three
pulse width modulated fuel rail pressure regulators.
Fuel pressure regulator 1 & 3 are located in the fuel
injection pump and meters the amount of fuel that
enters the high pressure side of the pump. From the
high pressure pump, the fuel moves to the fuel rail
through high pressure steel lines. The fuel rail
distributes high pressure fuel to all 6 fuel injectors.
Fuel Pressure Regulator 2
The ECM controls the fuel rail pressure using 3 pulse
width modulated fuel rail pressure regulators. Fuel
pressure regulator 2 is located on the rear of the fuel
rail and meters the amount of fuel being returned to the
fuel tank. The ECM varies the PWM voltage to fuel
pressure regulator 2 to relieve excessive fuel pressure
allowing fuel to return to the fuel tank. When the ignition
is OFF, fuel pressure regulator 2 opens to bleed off the
pressure on the high pressure side of the fuel system.
Fuel Pressure Sensor
The fuel pressure sensor is located in the fuel feed
pipe. The fuel pressure sensor monitors the fuel
pressure in the fuel line. The fuel pump driver control
module monitors the voltage signal from the fuel
pressure sensor and sends serial data to the ECM to
provide low side fuel pressure control.
Fuel Rail Pressure Sensor
The fuel rail pressure sensor is a dual analog sensor
that provides two fuel rail pressure signals to the engine
control module (ECM) and is located in the end of the
fuel rail assembly.
Fuel Tank Fuel Pump Module
The fuel tank fuel pump module is located inside of the
fuel tank. The fuel tank fuel pump module contains the
following major components: the fuel level sensor, fuel
pump and reservoir assembly and fuel strainer.
Turbocharger
Charge Air Cooler and Intercooler
The turbocharger is supported by an air-to-water
charge air cooler (CAC) system, which uses fresh air
drawn through a heat exchanger to reduce the
temperature of the warmer compressed air forced
through the intake system. Inlet air temperature can be
reduced by up to 180°F (100°C), which enhances
performance. This is due to the higher density of
oxygen in the cooled air, which promotes optimal
combustion. The intake manifold housing has an
integrated intercooler. The intercooler uses
conventional coolant in a system that is separate from
the engine cooling system. The intercooler system
includes an air cooler/heat exchanger built into the
intake, a charge air cooler radiator assembled in the
front fascia, and an electric coolant pump. Coolant is
pumped through the intercooler, enters through the inlet
Page 12
September, 2019
port, is directed into and through the charge air cooler/
heat exchanger, and exits through the outlet port and
pumped back to the charge air cooler radiator.
Charge Air Cooler Coolant Pump
Bulletin No.: 19-NA-180
through a single fuse and are controlled by the ECM.
The engine mount solenoid valves are identified in the
Master Electrical Component List as follows:
• Q80L Engine Mount Solenoid Valve - Left
• Q80R Engine Mount Solenoid Valve - Right
Oil — dexosD™ DIESEL
Specification
5347910
The CAC coolant pump (1) is a solid state device.
Ignition voltage is supplied from a fuse and ground is
provided at the chassis. When the engine starts, the
ECM sends a request via serial data circuit to the CAC
coolant pump commanding it to operate at the desired
speed. The charge air cooler coolant pump provides
operational and diagnostic feedback to the ECM on the
serial data circuit. If a condition exists with the physical
pump, or microprocessor logic, the device will report
fault specific information via the serial data circuit to the
ECM. The ECM will then set the corresponding DTC. If
the device fails to communicate or a condition exists
with external circuits, the devices corresponding
U-code will set.
Active Engine Mount
Overview
The MY2020 Silverado 1500 and MY2020 Sierra 1500
trucks equipped with the Duramax® 3.0L will use an
active engine mount system to cradle the engine. The
active engine mounts are used to enable an optimal
balance between vehicle Noise Vibration and
Harshness (NVH) performance and vehicle dynamics.
This includes during key cycles and Stop/Start events.
The variable viscosity technology is essentially an
adaptive shock absorber that actively controls engine
vibration, reducing a significant amount of vibration
from the engine and contributing to lower NVH levels.
There is a single solenoid on each active engine mount
that is energized during an ignition event and switched
ON for idle and driving events. The engine mount
solenoid valves are supplied with battery voltage
5337377
Engine oils approved by GM as meeting the dexosD™
diesel specification are marked with the dexosD™
DIESEL logo.
Use engine oils that meet the dexosD™ diesel
specification, such as ACDelco™ Light Duty Diesel
engine oil. The oil can be purchased directly from
ACDelco™.
Visit the dexos™ website at https://www.gmdexos.com/
index.html
Viscosity Grade
Use SAE 0W20 dexosD™ DIESEL engine oil in the
2020 Duramax® 3.0L — RPO LM2 engine. Do not add
anything to the oil.
Stop/Start System
Overview
Warning: The automatic engine Stop/Start System
causes the engine to shut OFF while the vehicle is
still ON. Do not exit the vehicle before shifting to
P (Park). The vehicle may restart and move
unexpectedly. Always shift to P, and then turn the
ignition OFF before exiting the vehicle.
The Stop/Start system will shut OFF the engine to help
conserve fuel. It has components designed for the
increased number of engine starts that will occur.
Bulletin No.: 19-NA-180
September, 2019
Auto Engine Stop/Start
When the brakes are applied and the vehicle is at a
complete stop, the engine may turn OFF. When
stopped, the tachometer indicator will point to: AUTO
STOP. When the brake pedal is released or the
accelerator pedal is pressed, the engine will restart. To
maintain vehicle performance and/or passenger
comfort, other conditions may cause the engine to
automatically restart before the brake pedal is released.
Auto Stops may not occur and/or Auto Starts may
occur because of the following:
– The climate control settings require the engine to be
running to cool or heat the vehicle interior as needed.
– The vehicle battery charge is low.
– The vehicle battery has recently been disconnected.
– A minimum vehicle speed has not been reached
since the last Auto Stop.
– The accelerator pedal is pressed.
– The engine or transmission has not met the required
operating temperature.
– The ambient temperature is not in the required
operating range.
– The transmission is in any gear other than D.
– Tow/Haul Mode or other drive modes have been
selected.
– The vehicle is on a steep hill or grade.
– The driver door has been opened or the driver seat
belt has been unbuckled.
– The hood has been opened.
– Auto Stop has reached the maximum allowed time.
Auto Stop Disable Switch
The automatic Engine Stop/Start feature can be
disabled and enabled by pressing the switch with the A
surrounded by a circular arrow symbol. Auto Stop is
enabled each time the vehicle is started. When the A
surrounded by a circular arrow symbol is illuminated,
the system is enabled.
Page 13
Transmission 10L80 10-Speed —
RPO MQB
Operation
5116656
10L80, 10-Speed, Automatic, ATSS, CPA, GEN 2 —
RPO MQB
The 10L80 10-speed is a fully automatic, rear-wheel
drive, electronic-controlled transmission. The 10-speed
ratios are generated using four simple planetary
gearsets, two brake clutches, and four rotating
clutches. The resultant on-axis transmission
architecture utilizes a squashed torque converter, an
off-axis pump and 4 close coupled gearsets. The
4 rotating clutches are located forward of the gearsets
to minimize the length of oil feeds which provides for
enhanced shift response. There are different variants of
the transmission, all based on torque capacity.
Architecture is common between the variants, and
component differences are primarily related to size.
The transmission architecture features a case with
integral bell housing for enhanced powertrain stiffness.
A unique pump drive design allows for off-axis
packaging very low in the transmission. The pump is a
variable vane type which effectively allows for 2 pumps
in the packaging size of 1 pump. This design and
packaging strategy not only enables low parasitic
losses and optimum priming capability but also
provides for ideal oil routing to the controls system, with
the pump located in the valve body itself. The
transmission control module (TCM) is externally
mounted, enabling packaging and powertrain
integration flexibility. The controller makes use of
3 speed sensors which provide for enhanced shift
response and accuracy.
Page 14
September, 2019
The 4 element torque converter contains a pump, a
turbine, a pressure plate splined to the turbine, and a
stator assembly. The torque converter acts as a fluid
coupling to smoothly transmit power from the engine to
the transmission. It also hydraulically provides
additional torque multiplication when required. The
pressure plate, when applied, provides a mechanical
direct drive coupling of the engine to the transmission.
The planetary gear sets provide 10 forward gear ratios
and 1 reverse. Changing gear ratios is fully automatic
and is controlled by the TCM. The TCM receives and
monitors various electronic sensor inputs and uses this
information to shift the transmission at the
optimum time.
The hydraulic system primarily consists of an off-axis
gear-driven variable vane-type pump next to the valve
body, and 2 control valve body assemblies. The pump
maintains the working pressures needed to stroke the
clutch pistons that apply or release the friction
components. These friction components, when applied
or released, support the automatic shifting qualities of
the transmission.
The friction components used in this transmission
consist of 6 multiple disc clutches. The multiple disc
clutches deliver 11 different gear ratios, 10 forward and
1 reverse, through the gear sets. The gear sets then
transfer torque through the output shaft.
Transmission — Torque Converter with
Centrifugal Pendulum Absorber
Centrifugal Pendulum Absorber
To control vibration and noise inside of the vehicle, GM
engineers integrated a device called a centrifugal
pendulum absorber (CPA) in the torque converter that
is used with the 10 speed 10L80 automatic
transmission. The CPA is an absorbing damper with a
set of secondary spring masses, that when energized
cancels out the engine’s torsional vibrations so the
driver and passengers can’t feel them. In this unique
design the spring masses vibrate in the opposite
direction of the torsional vibrations of the engine
balancing out undesirable torsional vibrations, thereby
improving NVH levels.
Bulletin No.: 19-NA-180
5120211
1.
2.
3.
4.
Pendulum masses.
Output isolator spring.
Input isolator spring.
Output hub.
Special Tools
The following new tools were released for the 2020
Duramax® 3.0L — RPO LM2:
Special Tools — Tool Number and
Description
Tool Number
Description
EN-52445
Camshaft Tool
EN-52446
Rear Crankshaft Seal
Installer
EN-52448
High Pressure Fuel
Pump Tool
EN-52449
Engine Stand Adapter
EN-52451
Fuel Injector Remover
EN-52452
Installer, Front
Crankshaft Seal
EN-52474
Engine Lift Bracket
Assembly
EN-52579
Crankshaft Rotator Tool
EN-52586
Fixing Pin, Crankshaft
Timing
EN-50717-20
Valve Spring Compressor
Adapter
Bulletin No.: 19-NA-180
September, 2019
Page 15
Training Courses
Training Courses — Description and
Number
Description
Course Name and
Number
Engine
16440.24D-V: Engine:
New and Updates for
RPOs LM2, LTA, LSY,
L3B, L8T
#17041.79W: 10-Speed
Automatic Transmission
Overview
Version Information
Version
1
Modified
Released August 24, 2019
Trademark Footnotes
ACDelco™ is a Trademark of General Motors
LLC
dexosD™ and the dexosD DIESEL logo are
Trademarks of General Motors
LLC
DEXRON™ is a Trademark of General Motors
LLC
Duramax™ is a Trademark of General Motors
LLC
Duramax® is a Registered Trademark of General
Motors LLC (United States)
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: 19NA180
Replacement Service Bulletin Number:
MFR Communication Date: 2019-08-28
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING:ENGINE:DIESEL
MFR Component System:
MFR Component Subsystem:
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