2006 GMC SIERRA adding oil

CHANGE ENGINE OIL
This message is displayed when the engine oil needs to
be changed.
When you change the engine oil, be sure to reset the
CHANGE ENGINE OIL message. SeeEngine Oil Life
System (Gasoline Engine) on page 5-23,Engine Oil
(Gasoline Engine) on page 5-20, andScheduled
Maintenance (Gasoline Engine) on page 6-4for more
information.
CHARGING SYSTEM FAILURE
On some vehicles, if there is a problem with the generator
and battery charging system, this message will appear on
the DIC, a chime will sound, and the battery warning light
on the instrument panel cluster will come on. Driving
with this problem could drain your battery. Turn off all
unnecessary accessories. Stop and turn off the vehicle
as soon as it is safe to do so. Have the electrical system
checked by your GM dealer immediately. SeeBattery
Warning Light on page 3-40andVoltmeter Gage on
page 3-40for more information.
CHECK OIL LEVEL
If your vehicle has an oil level sensor, and the oil level in
the vehicle is low, this message will appear on the DIC.
Check the oil level and correct it as necessary. You may
need to let the vehicle cool or warm up and cycle the
ignition to be sure this message will clear. Once the
problem is corrected, pressing any of the four DIC
buttons will acknowledge the message and clear it from
the DIC display. If your vehicle does not have the four
DIC buttons, pressing the trip odometer reset stem will
acknowledge the message and clear it from the DIC
display. SeeEngine Oil (Gasoline Engine) on page 5-20
for additional information.
CHECK WASHER FLUID
If the washer uid level is low, this message will appear
on the DIC. SeeWindshield Washer Fluid on page 5-46.
Adding washer uid to the windshield washer reservoir
will clear the message. Pressing any of the four DIC
buttons will acknowledge the message and clear it from
the DIC display. If your vehicle does not have the four
DIC buttons, pressing the trip odometer reset stem will
acknowledge the message and clear it from the DIC
display.
3-57

KEYFOB X BATTERY LOW
If a remote keyless entry transmitter battery is low, this
message will appear on the DIC. The battery needs to be
replaced in the transmitter. See “Battery Replacement”
underRemote Keyless Entry System Operation on
page 2-5. Pressing any of the four DIC buttons will
acknowledge the message and clear it from the DIC
display. If your vehicle does not have the four DIC
buttons, pressing the trip odometer reset stem will
acknowledge the message and clear it from the
DIC display.
LEFT REAR DOOR AJAR (Crew Cab)
If the driver’s side rear door is not fully closed, this
message will appear on the display and you will hear a
chime. Stop and turn off the vehicle, check the door for
obstacles and close the door again. Check to see if the
message still appears on the DIC. Pressing any of the
four DIC buttons will acknowledge the message and clear
it from the DIC display. If your vehicle does not have the
four DIC buttons, pressing the trip odometer reset stem
will acknowledge the message and clear it from the
DIC display.
LOW COOLANT LEVEL
Notice:Engine damage from running your engine
without coolant is not covered by your warranty. See
“Overheated Engine Protection Operating Mode”
in the Index for information on driving to a safe
place in an emergency.
If your vehicle has a low coolant level sensor, this
message will appear on the DIC if the engine coolant
level is low. Adding coolant to the coolant recovery
tank will clear the message. SeeCooling System on
page 5-40. Pressing any of the four DIC buttons will
acknowledge the message and clear it from the DIC
display. If your vehicle does not have the four DIC
buttons, pressing the trip odometer reset stem will
acknowledge the message and clear it from the
DIC display.
OIL LIFE RESET
This message will appear on the display for about
10 seconds after resetting the change engine oil
message. See “Engine Oil Life System” underDIC
Operation and Displays on page 3-53andEngine Oil
(Gasoline Engine) on page 5-20for more information.
3-59

Service............................................................5-4
Accessories and Modications..........................5-4
California Proposition 65 Warning.....................5-4
Doing Your Own Service Work.........................5-5
Adding Equipment to the Outside of
Your Vehicle..............................................5-5
Fuel................................................................5-5
Gasoline Octane............................................5-6
Gasoline Specications....................................5-6
California Fuel...............................................5-7
Additives.......................................................5-7
Fuel E85 (85% Ethanol)..................................5-8
Fuels in Foreign Countries...............................5-9
Filling the Tank............................................5-10
Filling a Portable Fuel Container.....................5-11
Checking Things Under the Hood....................5-12
Hood Release..............................................5-13
Engine Compartment Overview.......................5-14
Engine Oil (Gasoline Engine)..........................5-20
Engine Oil Life System (Gasoline Engine)........5-23
Engine Air Cleaner/Filter (Gasoline Engines).......5-25
Automatic Transmission Fluid
(Except Allison Transmission
®) ....................5-28Automatic Transmission Fluid
(Allison Transmission
®) ...............................5-30
Manual Transmission Fluid.............................5-33
Hydraulic Clutch...........................................5-34
Engine Coolant.............................................5-35
Coolant Surge Tank Pressure Cap..................5-37
Engine Overheating.......................................5-37
Overheated Engine Protection Operating Mode
(V8 Engines Only)......................................5-39
Cooling System............................................5-40
Engine Fan Noise.........................................5-45
Power Steering Fluid.....................................5-45
Windshield Washer Fluid................................5-46
Brakes........................................................5-47
Battery........................................................5-51
Jump Starting...............................................5-52
Rear Axle.......................................................5-58
Four-Wheel Drive............................................5-59
Front Axle......................................................5-60
Noise Control System.....................................5-62
Tampering with Noise Control System
Prohibited.................................................5-62
Section 5 Service and Appearance Care
5-1

To ensure quick starts in the wintertime, the E85 fuel
must be formulated properly for your climate according to
ASTM specication D 5798. If you have trouble starting
on E85, it may be because your E85 fuel is not properly
formulated for your climate. If this happens, switching to
gasoline or adding gasoline to your fuel tank may improve
starting. Your vehicle is designed to accommodate a
mixture of gasoline and E85 fuel. For good starting and
heater efficiency below 32°F (0°C), the fuel mix in the fuel
tank should contain no more than 70% ethanol.
E85 has less energy per gallon than gasoline, so you will
need to rell your fuel tank more often when using E85
than when you are using gasoline. Regular unleaded
gasoline is recommended when pulling a trailer. For
payload capacity with ethanol fuel, seeLoading Your
Vehicle on page 4-48.
Notice:Some additives are not compatible with E85
fuel and may harm your fuel system. Damage caused
by additives would not be covered by your new
vehicle warranty. Do not use additives with E85 fuel.Notice:Your vehicle was not designed for fuel
that contains methanol. Do not use fuel containing
methanol. It can corrode metal parts in your fuel
system and also damage the plastic and rubber
parts. That damage would not be covered under
your warranty.
Fuels in Foreign Countries
If you plan on driving in another country outside the
United States or Canada, the proper fuel may be hard
to nd. Never use leaded gasoline or any other fuel
not recommended in the previous text on fuel. Costly
repairs caused by use of improper fuel would not
be covered by your warranty.
To check the fuel availability, ask an auto club, or
contact a major oil company that does business in
the country where you will be driving.
5-9

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter (Gasoline Engines) on page 5-25.
B. Coolant Surge Tank and Pressure Cap. SeeEngine
Coolant on page 5-35andCoolant Surge Tank
Pressure Cap on page 5-37.
C. Air Filter Restriction Indicator (If Equipped).
SeeEngine Air Cleaner/Filter (Gasoline Engines) on
page 5-25.
D. Engine Oil Dipstick. See “Checking Engine Oil”
underEngine Oil (Gasoline Engine) on page 5-20.
E. Automatic Transmission Fluid Dipstick (If Equipped).
See “Checking the Fluid Level” underAutomatic
Transmission Fluid (Except Allison Transmission
®)
on page 5-28orAutomatic Transmission Fluid
(Allison Transmission
®) on page 5-30.
F. Engine Cooling Fan. SeeCooling System on
page 5-40.
G. Engine Oil Fill Cap. See “When to Add Engine Oil”
underEngine Oil (Gasoline Engine) on page 5-20.H. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-45.
I. Remote Negative (−) Terminal (GND). SeeJump
Starting on page 5-52.
J. Remote Positive (+) Terminal. SeeJump Starting on
page 5-52.
K. Brake Fluid Reservoir. See “Brake Fluid” under
Brakes on page 5-47.
L. Clutch Fluid Reservoir (If Equipped). SeeHydraulic
Clutch on page 5-34.
M. Underhood Fuse Block. SeeUnderhood Fuse Block
on page 5-127.
N. Battery. SeeBattery on page 5-51.
O. Windshield Washer Fluid Reservoir. See “Adding
Washer Fluid” underWindshield Washer Fluid
on page 5-46.
5-15

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter (Gasoline Engines) on page 5-25.
B. Coolant Surge Tank and Pressure Cap. SeeEngine
Coolant on page 5-35andCoolant Surge Tank
Pressure Cap on page 5-37.
C. Air Filter Restriction Indicator (If Equipped).
SeeEngine Air Cleaner/Filter (Gasoline Engines)
on page 5-25.
D. Engine Oil Dipstick. See “Checking Engine Oil”
underEngine Oil (Gasoline Engine) on page 5-20.
E. Automatic Transmission Fluid Dipstick (If Equipped).
See “Checking the Fluid Level” underAutomatic
Transmission Fluid (Except Allison Transmission
®)
on page 5-28orAutomatic Transmission Fluid
(Allison Transmission
®) on page 5-30.
F. Engine Oil Fill Cap. See “When to Add Engine Oil”
underEngine Oil (Gasoline Engine) on page 5-20.
G. Engine Cooling Fan. SeeCooling System on
page 5-40.H. Remote Negative (−) Terminal (GND). SeeJump
Starting on page 5-52.
I. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-45.
J. Remote Positive (+) Terminal. SeeJump Starting on
page 5-52.
K. Brake Fluid Reservoir. See “Brake Fluid” under
Brakes on page 5-47.
L. Clutch Fluid Reservoir (If Equipped). SeeHydraulic
Clutch on page 5-34.
M. Underhood Fuse Block. SeeUnderhood Fuse Block
on page 5-127.
N. Battery. SeeBattery on page 5-51.
O. Windshield Washer Fluid Reservoir. See “Adding
Washer Fluid” underWindshield Washer Fluid
on page 5-46.
5-17

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter (Gasoline Engines) on page 5-25.
B. Coolant Surge Tank and Pressure Cap. SeeEngine
Coolant on page 5-35andCoolant Surge Tank
Pressure Cap on page 5-37.
C. Air Filter Restriction Indicator (If Equipped).
SeeEngine Air Cleaner/Filter (Gasoline Engines)
on page 5-25.
D. Engine Oil Dipstick. See “Checking Engine Oil”
underEngine Oil (Gasoline Engine) on page 5-20.
E. Automatic Transmission Fluid Dipstick (If Equipped).
See “Checking the Fluid Level” underAutomatic
Transmission Fluid (Except Allison Transmission
®)
on page 5-28orAutomatic Transmission Fluid
(Allison Transmission
®) on page 5-30.
F. Engine Oil Fill Cap. See “When to Add Engine Oil”
underEngine Oil (Gasoline Engine) on page 5-20.
G. Engine Cooling Fan. SeeCooling System on
page 5-40.H. Remote Negative (−) Terminal (GND). SeeJump
Starting on page 5-52.
I. Remote Positive (+) Terminal. SeeJump Starting on
page 5-52.
J. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-45.
K. Brake Fluid Reservoir. See “Brake Fluid” under
Brakes on page 5-47.
L. Clutch Fluid Reservoir (If Equipped). SeeHydraulic
Clutch on page 5-34.
M. Underhood Fuse Block. SeeUnderhood Fuse Block
on page 5-127.
N. Battery. SeeBattery on page 5-51.
O. Windshield Washer Fluid Reservoir. See “Adding
Washer Fluid” underWindshield Washer Fluid
on page 5-46.
5-19

Automatic Transmission Fluid
(Except Allison Transmission
®)
When to Check and Change Automatic
Transmission Fluid
A good time to check your automatic transmission uid
level is when the engine oil is changed.
Change the uid and lter at the intervals listed in
Additional Required Services (Gasoline Engine) on
page 6-7, and be sure to use the transmission uid
listed inRecommended Fluids and Lubricants
(Gasoline Engine) on page 6-14.
How to Check Automatic
Transmission Fluid
Because this operation can be a little difficult, you may
choose to have this done at the dealership service
department.
If you do it yourself, be sure to follow all the instructions
here, or you could get a false reading on the dipstick.
Notice:Too much or too little uid can damage
your transmission. Too much can mean that some
of the uid could come out and fall on hot engine
part or exhaust system parts, starting a re.Too little uid could cause the transmission to
overheat. Be sure to get an accurate reading if you
check your transmission uid.
Wait at least 30 minutes before checking the
transmission uid level if you have been driving:
When outside temperatures are above 90°F (32°C).
At high speed for quite a while.
In heavy traffic — especially in hot weather.
While pulling a trailer.
To get the right reading, the uid should be
at normal operating temperature, which is
180°F to 200°F (82°C to 93°C).
Get the vehicle warmed up by driving about 15 miles
(24 km) when outside temperatures are above
50°F (10°C). If it is colder than 50°F (10°C), drive the
vehicle in THIRD (3) until the engine temperature
gage moves and then remains steady for 10 minutes.
A cold uid check can be made after the vehicle
has been sitting for eight hours or more with the engine
off, but this is used only as a reference. Let the
engine run at idle for ve minutes if outside
temperatures are 50°F (10°C) or more. If it is colder
than 50°F (10°C), you may have to idle the engine
longer. Should the uid level be low during this cold
check, you must check the uid hot before adding uid.
Checking the uid hot will give you a more accurate
reading of the uid level.
5-28