CHEVROLET IMPALA 2016 10.G Bifuel Manual

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Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
ContentsIntroduction . . . . . . . . . . . . . . . . . . . . . . 2
Instruments and Controls . . . . . . . . 3
Driving and Operating . . . . . . . . . . . 7
Vehicle Care . . . . . . . . . . . . . . . . . . . . 16
Service and Maintenance . . . . . . . 21
Technical Data . . . . . . . . . . . . . . . . . 25
Index . . . . . . . . . . . . . . . . . . . . . 27

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
2 Introduction
Introduction
The names, logos, emblems,
slogans, vehicle model names, and
vehicle body designs appearing in
this manual including, but not limited
to, GM, the GM logo, CHEVROLET,
the CHEVROLET Emblem, IMPALA,
and the IMPALA Emblem are
trademarks and/or service marks of
General Motors LLC, its
subsidiaries, affiliates, or licensors.
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/applicationsthat 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).
Keep this manual in the vehicle for
quick reference.
Canadian Vehicle Owners
Propriétaires Canadiens
A French language manual can be
obtained from your dealer, at
www.helminc.com, or from:
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
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.
Litho in U.S.A.
Part No. 23343095 A First Printing©2015 General Motors LLC. All Rights Reserved.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Instruments and Controls 3
Instruments and
Controls
Warning Lights, Gauges, and
Indicators
Fuel Gauge . . . . . . . . . . . . . . . . . . . . . 3
Malfunction Indicator Lamp(Check Engine Light) . . . . . . . . . . 4
Low Fuel Warning Light . . . . . . . . . 5
Information Displays
Driver Information
Center (DIC) . . . . . . . . . . . . . . . . . . . 5
Vehicle Messages
Fuel System Messages . . . . . . . . . 6
Warning Lights,
Gauges, and
Indicators
Fuel Gauge
The vehicle has a fuel gauge that
displays either gasoline or CNG fuel
level.
Metric
English
With the ignition on, the gasoline/
CNG fuel gauge indicates remaining
fuel in the tank for the fuel that is
being used. See “Fuel Selector
Switch” underFuel08.
To check the level of the fuel not
being used, see Driver Information
Center (DIC) 05.
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 Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
4 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 (Check Engine
Light)
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.
This light comes on during a
malfunction in one of two ways:
Light Flashing
A misfire condition has been
detected. A misfire increases
vehicle emissions and could damage the emission control
system on the vehicle. Diagnosis
and service might be required.
To prevent more serious damage to
the vehicle:
.
Reduce vehicle speed.
. Avoid hard accelerations.
. Avoid steep uphill grades.
If the light continues to flash, find a
safe place to stop and park the
vehicle. Turn the vehicle off, wait at
least 10 seconds, and restart the
engine. If the light is still flashing,
follow the previous steps and see
your dealer for service as soon as
possible.
Light On Steady
An emission control system
malfunction has been detected on
the vehicle. Diagnosis and service
might be required.
See the owner manual for more
information.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Instruments and Controls 5
Low Fuel Warning Light
This light is near the fuel gauge and
comes on briefly when the ignition is
turned on as a check to show it is
working.
It also comes on when the fuel tank
is low on the fuel that is in operation
(gasoline or CNG).
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 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.
Fuel Range : Displays the
approximate distances the vehicle
can be driven with gasoline and
CNG without refueling. A total
distance with both gasoline and CNG distances combined is also
displayed. LOW will be displayed
when the vehicle is low on fuel. The
fuel range estimate is based on an
average of the vehicle’s current fuel
economy.
Average Fuel Economy (AFE) :
Located in the Trip A page of the
DIC, the AFE is shown for the fuel
that is in operation. The value
shown is the average for the fuel
used since the last Trip A reset
while running on that fuel. If no reset
occurs, the AFE value for each fuel
will continually recalculate the
average from the last reset.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
6 Instruments and Controls
Vehicle Messages
Fuel System Messages
FUEL MODE UNAVAILABLE
This message displays when the
current fuel mode selected is empty
or unavailable. See“Fuel Selector
Switch” underFuel08. The vehicle
will switch fuel modes automatically.
This is usually due to a low fuel
condition of the fuel type selected or
the engine is not warm enough after
an initial engine start up.
This message will also appear if the
vehicle has initiated a gasoline
system maintenance routine.
A switch to CNG will not be
available until this routine is
complete.
This message can also appear if a
transition to CNG is attempted in
cold start conditions. See “Cold
Weather Starting” underStarting the
Engine 07. This message may also appear if
the CNG tank valve is unable to
open fully during some vehicle
operating conditions.
SERVICE FUEL SYSTEM PARK
IN OPEN AREA
This vehicle is equipped with a CNG
fuel system diagnostic to ensure
proper function. This message
displays when the CNG fuel system
requires service.
Park the vehicle in an outdoor open
area, do not start the engine, refuel,
or drive the vehicle. Have the
vehicle towed to an authorized GM
dealer for service.
See
Fuel System Leak 014.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Driving and Operating 7
Driving and
Operating
Driving Information
Vehicle Load Limits . . . . . . . . . . . . . 7
Starting and Operating
Starting the Engine . . . . . . . . . . . . . . 7
Ride Control Systems
Traction Control/ElectronicStability Control . . . . . . . . . . . . . . . . 8
Fuel
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Filling the Tank (CNG) . . . . . . . . . . 9
Fuel System Leak . . . . . . . . . . . . . 14
Trailer Towing
Trailer Towing . . . . . . . . . . . . . . . . . . 15
Driving Information
Vehicle Load Limits
Caution
Loose items stored in the cargo
area may damage the CNG fuel
tank and fuel system
components. Secure all items in
the cargo area to avoid shifting
and any damage to the CNG fuel
tank and CNG fuel tank
components.
Starting and
Operating
Starting the Engine
Starting the engine in a CNG
vehicle is similar to starting a
gasoline engine. See “Starting the
Engine” in the owner manual.
Fuel Selection
A switch allows the selection of fuel.
See Fuel 08. The vehicle typically
defaults to the fuel used on the last
key cycle.
If a tank refill has occurred after an
automatic low fuel level transition
from one fuel to another, CNG to
gasoline for example, the vehicle
recognizes the refill and if conditions
are met, will start on the fuel last
selected on the switch.
To protect engine and gasoline fuel
system components, an automatic
switch to gasoline may occur at any
time. The vehicle will transition back
to CNG automatically once the
gasoline system has run for a pre–
set time.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
8 Driving and Operating
Cold Weather Starting
If the outside temperature is below
2 °C (35 °F), the engine may start on
gasoline when CNG is selected.
After starting on gasoline, the
vehicle will automatically transition
to CNG operation after a set amount
of warm-up time.
Using the engine heater,
if equipped, may make it easier to
start. See“Engine Heater” in the
owner manual.
. Turn off all electrical
accessories.
. Do not hold the ignition switch in
START for more than
15 seconds.
Caution
If you add electrical parts or
accessories, you could change
the way the engine operates. Any
resulting damage would not be
covered by the vehicle warranty.
See “Add-On Electrical
Equipment” in the owner manual.
Ride Control Systems
Traction Control/
Electronic Stability
Control
This vehicle has Traction Control
System (TCS) and StabiliTrak®
electronic stability control systems.
These systems are enabled
automatically and StabiliTrak cannot
be turned off. To turn off TCS, see
“Traction Control/Electronic Stability
Control”in the owner manual.
Fuel
If a fuel leak is suspected, see Fuel
System Leak 014.
. If the vehicle runs out of CNG or
gasoline, it will automatically
switch to the other fuel system,
if there is fuel.
. If it takes unusually long to fill
the CNG cylinder, the fuel fill
receptacle may be clogged.
Contact your dealer for
inspection and/or replacement.
See “Fuel Filling Problems” in
Filling the Tank (CNG) 09.
This vehicle is designed to operate
on gasoline or CNG and has a
gasoline tank and a CNG fuel
storage system. See “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 CNG fuel quality

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Driving and Operating 9
standards for general marketplace
vehicle usage; however, CNG is
available at both private and public
filling stations. We recommend use
of CNG that meets or exceeds SAE
J1616 specifications for fuel
composition and cleanliness. See
Filling the Tank (CNG)09.
Caution
Using below standard CNG fuel
quality may cause damage to the
CNG fuel system. Use only CNG
fuel meeting recommended CNG
fuel standards.
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 800kPa at 21 °C/
3,600 psig at 70 °F). Gas should
never be smelled unless it occurs
briefly during refueling. If gas is
smelled or a hissing sound is heard
at any other time, park in a well ventilated outdoor open area, 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. If you suspect a
fuel leak, follow the instructions
under
Fuel System Leak 014.
Fuel Selector Switch
The fuel selector switch is on the
instrument panel left of the steering
wheel. When the ignition is in ON/
RUN, press
0to select between
gasoline and CNG. The indicator
light in the fuel selector switch
comes on when the vehicle is
running on CNG.
Certain conditions must be met in
order to switch between gasoline
and CNG. The vehicle will start up
on the last fuel that was selected.
When the fuel selector switch is
pressed, the indicator light will flash
during a fuel transition. If the fuel
transition is unsuccessful, the DIC
will display FUEL MODE
UNAVAILABLE. See Fuel System
Messages 06.
Filling the Tank (CNG)
{Warning
CNG is flammable and highly
explosive. You could be killed or
seriously injured if leaking natural
(Continued)