2015 BUICK LACROSSE engine

Black plate (23,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
In Brief 1-23
E85 or FlexFuel
Vehicles with a yellow fuel cap can
use either unleaded gasoline or
ethanol fuel containing up to 85%
ethanol (E85). SeeE85 or FlexFuel
on page 9-60. For all other vehicles,
use only the unleaded gasoline
described under Fuel on page 9-58.
Driving for Better Fuel
Economy
Driving habits can affect fuel
mileage. Here are some driving tips
to get the best fuel economy
possible.
.Avoid fast starts and accelerate
smoothly.
.Brake gradually and avoid
abrupt stops.
.Avoid idling the engine for long
periods of time.
.When road and weather
conditions are appropriate, use
cruise control.
.Always follow posted speed
limits or drive more slowly when
conditions require.
.Keep vehicle tires properly
inflated.
.Combine several trips into a
single trip.
.Replace the vehicle's tires with
the same TPC Spec number
molded into the tire's sidewall
near the size.
.Follow recommended scheduled
maintenance.
Roadside Assistance
Program
U.S.: 1-800-252-1112
TTY Users (U.S. Only):
1-888-889-2438
Canada: 1-800-268-6800
New Buick owners are automatically
enrolled in the Roadside Assistance
Program. See
Roadside Assistance Program
on page 13-5.
OnStar®
This vehicle may be equipped with a
comprehensive, in-vehicle system
that can connect to a live OnStar
Advisor for Emergency, Security,
Navigation, Connection, and
Diagnostic Services. OnStar
services may require a paid
subscription. See OnStar Overview
on page 14-1.

Black plate (3,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
Keys, Doors, and Windows 2-3
Remote Keyless Entry
(RKE) System Operation
The Keyless Access system allows
for vehicle entry when the
transmitter is within range. See
“Keyless Access Operation”later in
this section.
The transmitter functions may work
up to 60 m (197 ft) away from the
vehicle.
Other conditions can impact the
performance of the transmitter.
Q(Lock): Press to lock all doors.
The turn signal indicators may flash
and/or the horn may sound on the
second press to indicate locking.
See “Remote Lock Feedback” under
Vehicle Personalization on
page 5-45.
If the driver door is open when
Qis
pressed, all doors lock except the
driver door, if enabled through the
vehicle personalization.
If the passenger door is open when
Qis pressed, all doors lock.
Pressing
Qmay also arm the
theft-deterrent system. See Vehicle
Alarm System on page 2-15.
K(Unlock): Press to unlock the
driver door or all doors. See “Door
Unlock Options” underVehicle
Personalization on page 5-45.
The turn signal indicators may flash
to indicate unlocking. See “Remote
Unlock Light Feedback” under
Vehicle Personalization on
page 5-45. Pressing
Kwill disarm the
theft-deterrent system. See Vehicle
Alarm System on page 2-15.
Memory seat positions may be
recalled when unlocking the vehicle.
See Memory Seats on page 3-7 and
“Auto Memory Recall” underVehicle
Personalization on page 5-45.
Y(Remote Trunk Release):
Press and hold to release the trunk.
7(Vehicle Locator/Panic
Alarm): Press and release to
initiate vehicle locator. The exterior
lamps flash and the horn chirps
three times.
Press and hold
7for at least
three seconds to sound the panic
alarm. The horn sounds and the
turn signals flash until
7is pressed
again or the vehicle is started.
/(Remote Vehicle Start):
If equipped, press
Qand release
and then immediately press and
hold
/for at least four seconds to
start the engine from outside the

Black plate (7,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
Keys, Doors, and Windows 2-7
4. Press the ENGINE START/STOP button. When the
transmitter is learned, the DIC
will show that it is ready to
program the next transmitter.
5. Remove the transmitter from the transmitter pocket and press
K.
To program additional
transmitters, repeat Steps 3–5.
When all additional transmitters
are programmed, press and hold
the ignition for 12 seconds to
exit programming mode.
Programming without a
Recognized Transmitter (Keyless
Access Vehicles Only)
If there are no currently recognized
transmitters available, follow this
procedure to program up to eight
transmitters. This feature is not
available in Canada. This procedure
will take approximately 30 minutes to complete. The vehicle must be off
and all of the transmitters you wish
to program must be with you.
1. Insert the vehicle key of the
transmitter into the key lock
cylinder on the outside of the
driver door and turn the key to
the unlock position five times
within 10 seconds.
The Driver Information Center
(DIC) displays REMOTE LEARN
PENDING, PLEASE WAIT.
2. Wait for 10 minutes until the DIC displays PRESS ENGINE
START BUTTON TO LEARN
and then press the ignition.
The DIC displays will again
show REMOTE LEARN
PENDING, PLEASE WAIT. 3. Repeat Step 2 two additional
times. After the third time, all
previously known transmitters
will no longer work with the
vehicle. Remaining transmitters
can be relearned during the next
steps.
The DIC display should now
show READY FOR
REMOTE #1.
4. Place the new transmitter intothe transmitter pocket inside the
armrest storage area.

Black plate (8,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
2-8 Keys, Doors, and Windows
5. Press the ENGINE START/STOP button. When the
transmitter is learned the DIC
will show that it is ready to
program the next transmitter.
6. Remove the transmitter from the transmitter pocket and press
K.
To program additional
transmitters, repeat Steps 4–6.
When all additional transmitters
are programmed, press and hold
the ignition for 12 seconds to
exit programming mode.
Starting the Vehicle with a Low
Transmitter Battery
When starting the vehicle, if the
transmitter battery is weak or there
is interference with the signal, the
DIC may display NO REMOTE
DETECTED or NO REMOTE KEY
WAS DETECTED, PLACE KEY IN
TRANSMITTER POCKET, THEN
START YOUR VEHICLE. The
REPLACE BATTERY IN REMOTE
KEY message may also be
displayed at this time.
To start the vehicle:
1. Place the transmitter in the transmitter pocket inside the
armrest storage area.
2. With the vehicle in P (Park) or N (Neutral), press the brake
pedal and the ENGINE START/
STOP button. See Starting the
Engine on page 9-18 for
additional information about the
vehicle's keyless ignition with
pushbutton start.
Replace the transmitter battery
as soon as possible.
Battery Replacement
Replace the battery if the REPLACE
BATTERY IN REMOTE KEY
message displays in the DIC. See
Key and Lock Messages on
page 5-39.
{Caution
When replacing the battery, do
not touch any of the circuitry on
the transmitter. Static from your
body could damage the
transmitter.
The battery is not rechargeable. To
replace the battery:
1. Push the button on the transmitter to extend the key.
2. Remove the battery cover by prying it with a finger.
3. Remove the battery by pushing on the battery and sliding it
toward the key blade.

Black plate (9,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
Keys, Doors, and Windows 2-9
4. Insert the new battery, positiveside facing up. Push the battery
down until it is held in place.
Replace with a CR2032 or
equivalent battery.
5. Snap the battery cover back on to the transmitter.
Remote Vehicle Start
If available, this feature allows the
engine to be started from outside
the vehicle.
The
/button will be on the RKE
transmitter if the vehicle has remote
start.
Laws in some local communities
may restrict the use of remote
starters. For example, some laws
may require a person using remote
start to have the vehicle in view.
Check local regulations for any
requirements. Starting the Engine Using Remote
Start
To start the engine using the remote
start feature:
1. Aim the RKE transmitter at the
vehicle.
2. Press and release
Q.
3. Immediately after completing Step 2, press and hold
/for at
least four seconds or until the
turn signal lamps flash. The turn
signal lamps flashing confirms
the request to remote start the
vehicle has been received.
When the engine starts, the
parking lamps will turn on and
remain on as long as the engine
is running. The doors will be
locked and the climate control
system may come on.
Turn the ignition to ON/RUN (Key
Access), or select the ON/RUN/
START ignition position (Keyless
Access), to drive the vehicle. The engine will shut off after
10 minutes unless a time extension
is done or the ignition is put in ON/
RUN (Key Access) or ON/RUN/
START (Keyless Access).
The climate control system will use
the previous setting during a remote
start. The rear defog may come on
during remote start based on cold
ambient conditions. The rear defog
indicator light does not come on
during remote start. See
“Remote
Start Climate Control Operation” in
Dual Automatic Climate Control
System on page 8-1. Vehicles with
heated or heated and ventilated
front seats can have this feature
turn on automatically during a
remote start. See “Remote Start
Auto Heat Seats” and“Remote Start
Auto Cool Seats” underVehicle
Personalization on page 5-45.

Black plate (10,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
2-10 Keys, Doors, and Windows
Extending Engine Run Time
The engine run time can also be
extended by another 10 minutes,
if during the first 10 minutes
Steps 1–3 are repeated while the
engine is still running. An extension
can be requested, 30 seconds after
starting. This provides a total of
20 minutes.
The remote start can only be
extended once.
When the remote start is extended,
the second 10-minute period is
added on to the first 10 minutes for
a total of 20 minutes.
A maximum of two remote starts,
or a remote start with an extension,
are allowed between ignition cycles.
The vehicle's ignition must be
changed to ON/RUN/START and
then back to OFF before the remote
start procedure can be used again.Canceling a Remote Start
To cancel a remote start, do any of
the following:
.Aim the RKE transmitter at the
vehicle and press and hold
/
until the parking lamps turn off.
.Turn on the hazard warning
flashers.
.Turn the vehicle on and then off.
Conditions in Which Remote Start
Will Not Work
The remote start will not operate if:
.The key is in the ignition (Key
Access) or the ignition is in any
position other than OFF (Keyless
Access).
.The transmitter is in the vehicle
(Keyless Access).
.The hood is not closed.
.The hazard warning flashers
are on.
.There is an emission control
system malfunction.
.The engine coolant temperature
is too high.
.The oil pressure is low.
.Two remote vehicle starts have
already been used.
.The vehicle is not in P (Park).

Black plate (13,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
Keys, Doors, and Windows 2-13
Manual Safety Locks
If equipped, the safety lock is
located on the inside edge of the
rear doors. To use the safety lock:
1. Insert the key into the safety lockslot and turn it so the slot is in
the horizontal position.
2. Close the door.
3. Do the same for the other rear door. To open a rear door when the safety
lock is on:
1. Unlock the door by activating the
inside handle, by using the
power door lock switch, or by
using the Remote Keyless
Entry (RKE) transmitter.
2. Open the door from the outside.
To cancel the safety lock:
1. Unlock the door and open it from the outside.
2. Insert the key into the safety lock slot and turn it so the slot is in
the vertical position. Do the
same for the other door.
Doors
Trunk
{Warning
Exhaust gases can enter the
vehicle if it is driven with the
liftgate, trunk/hatch open, or with
any objects that pass through the
seal between the body and the
trunk/hatch or liftgate. Engine
exhaust contains carbon
monoxide (CO) which cannot be
seen or smelled. It can cause
unconsciousness and even death.
If the vehicle must be driven with
the liftgate, or trunk/hatch open:
.Close all of the windows.
.Fully open the air outlets on
or under the instrument
panel.
(Continued)

Black plate (14,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
2-14 Keys, Doors, and Windows
Warning (Continued)
.Adjust the climate control
system to a setting that
brings in only outside air and
set the fan speed to the
highest setting. See“Climate
Control Systems” in the
Index.
.If the vehicle has a power
liftgate, disable the power
liftgate function.
For more information about
carbon monoxide, see Engine
Exhaust on page 9-26.
Remote Trunk Release
To open the trunk, pressVon the
driver door when the vehicle is off or
in P (Park).
To open the trunk from outside the
vehicle, press and hold
Yon the
Remote Keyless Entry (RKE)
transmitter to unlock all doors, then
use the touch pad above the license
plate. If equipped with Keyless
Access, the trunk can be opened
using the touch pad when the RKE
transmitter is within 1 m (3 ft) of the
rear of the vehicle.
Emergency Trunk Release
Handle
{Caution
Do not use the emergency trunk
release handle as a tie-down or
anchor point when securing items
in the trunk as it could damage
the handle.