GMC 2016 Silverado User manual

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2k16_CS6_Misc_silverado_sierra_bifuel_23341897A.ai 1 9/23/2015 11:58:10 AM2k16_CS6_Misc_silverado_sierra_bifuel_23341897A.ai 1 9/23/2015 11:58:10 AM

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Contents Introduction . . . . . . . . . . . . . . . . . . . . . . 2
Instruments and Controls . . . . . . . . 5
Driving and Operating . . . . . . . . . . . 8
Vehicle Care . . . . . . . . . . . . . . . . . . . . 22
Service and Maintenance . . . . . . . 26
Technical Data . . . . . . . . . . . . . . . . . 30
Index ..................... 32

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
2 Introduction
Introduction
The names, logos, emblems,
slogans, vehicle model names, and
vehicle body designs appearing in
this supplement including, but not
limited to, GM, the GM logo,
CHEVROLET, the CHEVROLET
Emblem, GMC, the GMC Truck
Emblem, SILVERADO, and SIERRA
are trademarks and/or service
marks of General Motors LLC, its
subsidiaries, affiliates, or licensors.
For vehicles first sold in Canada,
substitute the name “General
Motors of Canada Limited”for
Chevrolet and GMC Motor Division
wherever it appears in this manual.
This manual describes features that
may or may not be on the vehicle
because of optional equipment that
was not purchased on the vehicle,
model variants, country
specifications, features/applications
that may not be available in your
region, or changes subsequent to
the printing of this owner manual.
Refer to the purchase
documentation relating to your
specific vehicle to confirm the
features.
This vehicle is designed to operate
on gasoline or Compressed Natural
Gas (CNG). It will not operate on
diesel or Liquefied Petroleum
Gas (LPG) fuel.
Keep this manual in the vehicle for
quick reference.
Canadian Vehicle Owners
A French language manual can be
obtained from your dealer, at
www.helminc.com, or from:
Propriétaires Canadiens
On peut obtenir un exemplaire de
ce guide en français auprès du
concessionnaire ou à l'adresse
suivante:
Helm, Incorporated
Attention: Customer Service
47911 Halyard Drive
Plymouth, MI 48170
USA
Litho in U.S.A.
Part No. 23341897 A First Printing ©2015 General Motors LLC. All Rights Reserved.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Introduction 3
Using this Supplement
This supplement contains
information specific to the unique
components of the vehicle. It does
not explain everything you need to
know about the vehicle. Read this
supplement along with the owner
manual to learn about the vehicle's
features and controls.
Index
A good place to look for what you
need is the Index in back of this
supplement. It is an alphabetical list
of what is in the supplement, and
the page number where you will
find it.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
4 Introduction
2NOTES

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Instruments and Controls 5
Instruments and
Controls
Warning Lights, Gauges, and
Indicators
Fuel Gauge ..................... 5
Malfunction Indicator Lamp . . . . . 6
Information Displays
Driver Information
Center (DIC) . . . . . . . . . . . . . . . . . . . 7
Warning Lights,
Gauges, and
Indicators
Fuel Gauge
The vehicle has a gasoline/CNG
fuel gauge.
Metric
English
When the ignition is on, the
gasoline/CNG fuel gauge indicates
about how much fuel is left in
the tank.
When the engine is running, the fuel
gauge displays the level for the type
of fuel that is currently being used.
The fuel level for the second fuel not
being used (gasoline or CNG) is
displayed in the Driver Information
Center (DIC).
For CNG, the fuel gauge has been
calibrated to display full at
approximately 24 800 kPa
(3,600 psig) and empty at
approximately 2 758 kPa (400 psig).

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
6 Instruments and Controls
CNG fuel gauge readings are
affected by changes in fuel
temperature and fuel pressure.
See “Fuel Gauge”in the owner
manual.
Malfunction
Indicator Lamp
The malfunction indicator lamp is in
the instrument cluster.
This vehicle has been specifically
designed to illuminate this indicator
when emissions exceed acceptable
levels while operating on either
gasoline or CNG fuel.
The malfunction indicator lamp
comes on to indicate that there is a
problem and service is required.
Malfunctions often will be indicated
by the system before any problem is
apparent. This system is also
designed to assist the service
technician in correctly diagnosing
any malfunction.
Caution
If the vehicle is continually driven
with this light on, the emission
controls might not work as well,
the vehicle fuel economy might
not be as good, and the engine
might not run as smoothly. This
could lead to costly repairs that
might not be covered by the
vehicle warranty.
This light should come on as a
check to show you it is working
when the ignition is on and the
engine is not running.
See the owner manual for more
information.
CNG Malfunction Indicator
The CNG indicator light on the fuel
selector switch in the center stack
will show if the CNG system has an
error. If the light is blinking rapidly
and does not stop, an error has
occurred. The light will continue to
flash rapidly until the problem is
corrected. See your dealer for
service.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Instruments and Controls 7
Information Displays
Driver Information
Center (DIC)
The DIC displays are shown in the
center of the instrument cluster in
the Info app. A bi-fuel vehicle with
the uplevel cluster will have the
following additional DIC info pages.
DIC Info Pages
Fuel Level : While operating on
CNG, the gasoline fuel level can be
viewed in the DIC.
CNG Fuel Level : While operating
on gasoline, the CNG fuel level can
be viewed in the DIC.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
8 Driving and Operating
Driving and
Operating
Driving Information
Vehicle Load Limits . . . . . . . . . . . . . 8
Truck-Camper Loading
Information . . . . . . . . . . . . . . . . . . . . 8
Starting and Operating
Starting the Engine . . . . . . . . . . . . . . 9
Fuel
Fuel ............................. 9
Filling the Tank . . . . . . . . . . . . . . . . . 11
Fuel System Leak . . . . . . . . . . . . . 16
Towing
Trailer Towing . . . . . . . . . . . . . . . . . . 18
Driving Information
Vehicle Load Limits
Pickup Models
{Warning
Do not remove the Compressed
Natural Gas (CNG) fuel tank
shield. Things carried in the bed
of the truck could shift forward
during a sudden stop or a
collision. The CNG fuel tank could
be damaged and cause a natural
gas leak. If the gas is,
accidentally, ignited, you or others
could be seriously injured. Make
sure things in the bed of the truck
are properly secured.
Cab Chassis Models
See the Body Builder Manual at
www.gmupfitter.com for fuel tank
cover modification restrictions.
Pickup and Cab Chassis Models
Caution
The CNG fuel tank and/or shield
could be damaged if objects are
stacked on or against the fuel
tank shield or sit or stand on the
shield. Never put anything on or
against the CNG fuel tank shield.
See “Vehicle Load Limits”in the
owner manual for cargo loading
instructions.
Truck-Camper Loading
Information
Pickup Models
The vehicle was neither
designed nor intended to carry a
slide-in camper.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Driving and Operating 9
Caution
Adding a slide-in camper or
similar equipment to the vehicle
can damage it, and the repairs
would not be covered by the
vehicle warranty. Do not install a
slide-in camper or similar
equipment on the vehicle.
Cab Chassis Models
For incomplete vehicle information,
see www.gmupfitter.com.
Starting and
Operating
Starting the Engine
Always maintain a minimum
gasoline level of at least one-quarter
tank. To protect engine components,
a switch to gasoline may occur at
any time. The vehicle will not start if
the engine stalls due to lack of
gasoline.
Fuel
If a fuel leak is suspected, see Fuel
System Leak 016.
.Whichever mode is selected, the
vehicle always starts on
gasoline. When CNG mode is
selected, the vehicle will
automatically transition from gas
to CNG. Always keep the
gasoline tank at least
one-quarter full.
.It is very important not to run the
gasoline tank out of fuel. The
system will not switch over to
CNG operation if the engine
stalls while running on gasoline.
.If the vehicle runs out of CNG
fuel, it will automatically switch
over to gasoline operation. For
normal CNG operation, fill the
CNG fuel storage system until
the fuel gauge or DIC fuel level
page displays at least
one-quarter full.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
10 Driving and Operating
.If it takes unusually long to fill
the CNG cylinder, the fuel fill
filter may be clogged. Contact
your dealer for inspection and/or
replacement.
This vehicle is designed to operate
on gasoline or Compressed Natural
Gas (CNG) and has a gasoline tank
and a CNG fuel storage system.
See “Recommended Fuel”under
“Fuel”in the owner manual for
gasoline information.
The general marketplace fuel quality
of CNG (for motor vehicles) in the
state of California should be in
compliance with Title 13 California
Code of Regulations, Section
2292.5. The remaining regions of
North America do not employ
regulated fuel quality standards for
general marketplace vehicle usage,
however, fuel is available at both
private and public filling stations.
We recommend use of natural gas
fuel from fueling stations designed
for providing fuel for vehicle use.
The main component of CNG is
methane, a highly flammable,
colorless gas. An odorant has been
added for detection through smell.
The smell is similar to that of rotten
eggs. The CNG in the vehicle is
stored under high pressure
(maximum 24 800 kPa/3,600 psig).
Gas should never be smelled and a
hissing sound should not be heard,
unless refueling is being done.
If gas is smelled or a hissing sound
is heard at any other time, shut
down the vehicle and have it
serviced. It may be possible to hear
the fuel flowing while the engine is
running if standing close to the
pipework or various fuel system
components (regulator, filter). This is
normal and should not be confused
with a hissing sound at fittings that
may indicate a fuel leak. Follow the
instructions under Fuel System Leak
016.
Fuel Selector Switch
The fuel selector switch is on the
center stack below the climate
controls. When the ignition is in
ON/RUN, press zto select
between gasoline and CNG mode.
The operating mode will be
maintained between key cycles. The
switch also includes the fuel
operation indicator light.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Driving and Operating 11
The vehicle always starts on
gasoline. If the fuel selector switch
is in CNG mode when the vehicle is
started, the vehicle will start on
gasoline and switch to CNG when
conditions for CNG operation have
been met. While waiting to
transition, the fuel operation
indicator light will be flashing at a
rate of once per second. If the
vehicle is turned off in gasoline
mode, when started it will remain in
gasoline mode until the fuel selector
switch is pressed. At temperatures
below freezing, it may take 10 to
15 minutes for the vehicle to switch
from gasoline to CNG. If the switch
is pressed to go to gasoline from
CNG while driving, the engine will
change to gasoline operation.
If operating in CNG mode and the
CNG tank is emptied, the vehicle
will automatically switch to gasoline
operation and the indicator light will
flash continuously. Press zto stop
the indicator light flashing. If the
system transitions more than
20 times in a single key cycle, it will
remain in the last mode selected.
When the vehicle is heavily loaded,
such as when towing a trailer up a
grade, it may be prevented from
switching to CNG. Once the high
loads are no longer present, the
system will switch.
Fuel Operation Indicator Light
The fuel operation indicator light
shows the current fuel mode or
indicates a transition between fuels.
.Off: Vehicle is currently
operating on gasoline.
.On: Vehicle is currently
operating on CNG.
.Flashing Slowly (Once per
Second): Vehicle is awaiting
changeover to selected fuel or
has started the changeover.
.Flashing Rapidly (10 Times per
Second): CNG system error. See
your dealer.
Filling the Tank
{Warning
CNG is flammable and highly
explosive. You could be killed or
seriously injured if leaking natural
gas is ignited. If you suspect a
leak, do not start the engine or
drive the vehicle. Have the
vehicle immediately towed,
inspected, and repaired by an
authorized GM dealer.
Before filling either fuel tank, turn off
the engine.
The gasoline tank is filled through
the standard fill pipe. See “Filling
the Tank”under “Fuel”in the owner
manual.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
12 Driving and Operating
The CNG fill valve is behind the fuel
door on the driver side of the tank
shield in the pickup bed.
There is an identifying blue
diamond-shaped CNG label on the
rear of the vehicle. Do not remove
this label. This label is necessary for
compliance with NFPA-52
regulations. Driving without this
label may violate the laws or
regulations in some states.
Replacement labels can be ordered
from your dealer.
Refueling Procedure
There are two methods of refueling:
fast filling or slow filling. Fast filling
is normally used in fuel stations for
natural gas vehicles. It takes about
six to eight minutes to fill up the fuel
tanks. Slow filling is done with a
vehicle refueling appliance or a
time-fill post provided by the fleet
operator. Refueling time varies
depending upon the refueling
system used —consult with the
refueling station attendant or system
provider. Always observe all safety
recommendations and operating
instructions on the refueling
equipment. When refueling, use a
fuel fill nozzle that complies with
ANSI/CSA-NGV 1-2006 standards.
Nozzles are designed according to
their maximum fill pressure: P30
(blue handle) for 20 684 kPa
(3,000 psig) and P36 (yellow
handle) for 24 800 kPa (3,600 psig).
Refuel with a yellow P36 nozzle
where available. Using a blue P30
nozzle will provide a partial fill only.
During fueling, CNG needs to be
delivered to the vehicle at the
appropriate pressure in relationship
to the ambient temperature. This
can be done automatically by a
temperature compensation system
on the CNG fuel dispenser or
manually by stopping the CNG fill at
a recommended pressure. GM
recommends that customers use
CNG fueling stations that have a
temperature compensation system
whenever possible. Check with the
fuel station. If one is not available,
see the temperature compensation
chart that follows in this section to
choose the appropriate fill pressure
for the ambient temperature. In
addition, fill only to the pressure
level for the lowest ambient
temperature anticipated during
fueling.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Driving and Operating 13
Leaving a vehicle connected to a
slow fill station can cause the tank
to be filled to a higher pressure than
recommended, especially when
outside temperatures fluctuate.
Disconnect the vehicle from the fill
station as soon as it is full, unless
an auto shutoff feature is used.
{Warning
If CNG tanks are filled to a higher
pressure than recommended and
then exposed to a much higher
ambient temperature
environment, expansion of the
gas caused by the temperature
change may cause pressure relief
devices on the vehicle CNG
tank(s) to release gas, as
designed. If an ignition source is
present, this could create a risk of
fire or explosion. If there is any
possibility that the tank has been
over pressurized, take steps to
relieve the excess pressure, such
as by driving or running the
vehicle in an outdoor open area
to remove some fuel.
Make sure that your CNG vehicle is
properly maintained and repaired to
avoid elevated temperatures
surrounding the tank, since elevated
temperatures in the area of the tank
could also raise the CNG pressure
in the tank.
Consult materials available
from NGVAmerica -
http://www.ngvc.org and the Clean
Vehicle Education Foundation -
http://www.cleanvehicle.org on CNG
fueling stations.
Ambient Temperature/Maximum
CNG Fill Pressure Compensation
Chart
To avoid the risk of fire or explosion
if an ignition source were present,
do not fill above the pressure level
that corresponds to the lowest
ambient temperature expected
during fueling.
Service Pressure 24 800 kPa
(3,600 psig) at 21 °C (70 °F).

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
14 Driving and Operating
Depending on CNG fill station
equipment/performance
and environmental conditions,
CNG fill volume will vary.
This will affect overall vehicle
range.
{Warning
Attempting to fill a CNG fuel
system that has a missing or
damaged O‐ring is dangerous.
Natural gas can leak. If the
natural gas is ignited, you or
others could be injured. Replace
the O‐ring before filling the tank.
Put the vehicle into P (Park) and
turn off the engine prior to refueling.
Remove the dust cap from the
receptacle, clean off any dirt or
debris on the receptacle, and follow

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Driving and Operating 15
the refueling instructions on the
pump or provided by the station
operator.
Refueling will stop automatically
when the tank is full. Wait for the
high pressure fuel to be purged from
the hose before disconnecting. See
the station operator for information
on how the line is purged. To
disconnect the vehicle from the
refueling station, remove the nozzle
from the fill valve. A hissing sound
may be heard as a small amount of
natural gas escapes. This is normal.
Put the fill valve dust cap on
securely and close the fuel
filler door.
If fuel or vapor is heard or seen
leaking from the nozzle-fill valve
connection, stop refueling
immediately. Dirt or other debris
may be preventing a positive
connection. Turn off the refueling
dispenser, disconnect the nozzle,
and inspect the fill valve for a
missing, damaged, dirty, or worn
O-ring. Reconnect the refueling
dispenser to the fill valve and begin
refueling again. If it continues to
leak, replace the fill valve O-ring.
To replace the fill valve O-ring:
1. Carefully remove the O-ring
from the groove in the fill valve.
A small flat-blade or pointed
tool can be used.
2. Make sure the groove is clean
and free of dirt and debris.
3. Install the new O-ring in the
groove in the fill valve. Make
sure the O-ring is properly
seated in the groove.
If it continues to leak after you have
replaced the O-ring, have an
authorized dealer inspect the
sealing O-ring in the fill valve.
If there is dirt or other debris on the
inside of the fuel fill valve, gas may
leak out after refueling. If you need
to add more fuel, do the refueling
procedure again.
See an authorized GM dealer for
replacement O-rings.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
16 Driving and Operating
Pressure Relief Devices
The CNG tank has pressure relief
devices that are designed to release
pressure if the CNG tank is
overheated or over pressurized.
If a pressure relief device releases
CNG, the CNG tank will be emptied
and will switch to gasoline,
if gasoline is available. A loud
rushing noise may be heard when
CNG is released.
Fuel System Leak
{Warning
Fuel vapors and fuel fires burn
violently and can cause injury or
death.
.Keep all smoking materials
and sources of ignition away
from the fuel system
components.
.CNG is non-toxic but the
vapors are lighter than air
and can cause oxygen
depletion if they are
(Continued)
Warning (Continued)
enclosed in a confined
space. Make sure there is
adequate ventilation and
use extreme caution if a
leak is suspected.
{Warning
If you smell a persistent natural
gas odor or hear a continual
hissing sound, there could be a
natural gas leak. If the natural gas
is ignited, you or others could be
injured. Do not start the engine or
drive the vehicle. Have the
vehicle towed to an authorized
GM dealer for service.
A slight natural gas odor may be
detected for a few moments after
refueling. This is normal. You should
not be able to smell natural gas at
any other time. If you do, or if you
hear a hissing sound, the fuel
system may have a leak.
If natural gas is smelled or a hissing
sound is heard:
1. Park the vehicle in a
well-ventilated area and apply
the parking brake. Keep heat,
sparks, and flame away. Open
all the vehicle doors for
ventilation.
2. Turn the ignition to LOCK/OFF.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Driving and Operating 17
3. The manual shutoff is near the
fuel fill valve on the driver side
of the tank shield in the
pickup bed.
A label is on the outside of the
vehicle near the manual shutoff
valve. Do not remove this label.
Turn the lever one-quarter turn
clockwise to turn off.
Do not drive the vehicle. The vehicle
should be towed to an authorized
GM dealer.
Do not add anything to the vehicle
that will cover the CNG fuel storage
system or restrict access to the
manual shutoff valve. See
Accessories and Modifications 022.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
18 Driving and Operating
Towing
Trailer Towing
For more information, see “Trailer
Towing”in the owner manual.
Weight of the Trailer
How heavy can a trailer safely be?
It depends on how the rig is used.
For example, speed, altitude, road
grades, outside temperature, and
how much the vehicle is used to pull
a trailer are all important. It can
depend on any special equipment
on the vehicle, and the amount of
tongue weight the vehicle can carry.
Maximum trailer weight is calculated
assuming only the driver is in the
tow vehicle and it has all the
required trailering equipment. The
weight of additional optional
equipment, passengers, and cargo
in the tow vehicle must be
subtracted from the maximum trailer
weight.

Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Driving and Operating 19
Use the following charts to determine how much the vehicle can weigh, based upon the vehicle model and options.
Vehicle Axle Ratio Maximum Trailer Weight GCWR*
2500 Series 2WD Regular Cab
Long Box 3.73 4 400 kg (9,700 lb) 7 530 kg (16,600 lb)
Long Box with UB7 3.73 4 400 kg (9,700 lb) 7 530 kg (16,600 lb)
Long Box 4.10 6 441 kg (14,200 lb) 9 571 kg (21,100 lb)
2500 Series 2WD Double Cab
Standard Box 3.73 4 264 kg (9,400 lb) 7 530 kg (16,600 lb)
Standard Box 4.10 5 897 kg (13,000 lb) 9 571 kg (21,100 lb)
Long Box 3.73 4 264 kg (9,400 lb) 7 530 kg (16,600 lb)
Long Box 4.10 6 305 kg (13,900 lb) 9 571 kg (21,100 lb)
2500 Series 2WD Crew Cab
Standard Box 3.73 4 173 kg (9,200 lb) 7 530 kg (16,600 lb)
Standard Box 4.10 5 897 kg (13,000 lb) 9 571 kg (21,100 lb)
Long Box 3.73 4 128 kg (9,100 lb) 7 530 kg (16,600 lb)
Long Box 4.10 6 169 kg (13,600 lb) 9 571 kg (21,100 lb)
2500 Series 4WD Regular Cab
Long Box 3.73 4 264 kg (9,400 lb) 7 530 kg (16,600 lb)
Long Box 4.10 6 305 kg (13,900 lb) 9 571 kg (21,100 lb)