ignition GMC SAVANA 2021 Workshop Manual

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Vehicle Care 177
Vehicle Care
General Information
General Information . . . . . . . . . . . . . . . . . . . 178
California Proposition 65 Warning . . . . . 178
California Perchlorate MaterialsRequirements . . . . . . . . . . . . . . . . . . . . . . . . 178
Accessories and Modifications . . . . . . . . . 178
Vehicle Checks
Doing Your Own Service Work . . . . . . . . . 179
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Engine Compartment Overview . . . . . . . . 180
Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Engine Oil Life System . . . . . . . . . . . . . . . . 186
Automatic Transmission Fluid (6-Speed Transmission) . . . . . . . . . . . . . . . . . . . . . . . . 186
Automatic Transmission Fluid (8-Speed Transmission) . . . . . . . . . . . . . . . . . . . . . . . . 189
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . 189
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . 191
Engine Overheating . . . . . . . . . . . . . . . . . . . 194
Engine Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Power Steering Fluid . . . . . . . . . . . . . . . . . . 196
Washer Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Brake Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Battery - North America . . . . . . . . . . . . . . . 198
Rear Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Noise Control System . . . . . . . . . . . . . . . . . 199 Starter Switch Check . . . . . . . . . . . . . . . . . . 200
Automatic Transmission Shift Lock
Control Function Check . . . . . . . . . . . . . . 201
Ignition Transmission Lock Check . . . . . . 201
Park Brake and P (Park) Mechanism Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Wiper Blade Replacement . . . . . . . . . . . . . 201
Windshield Replacement . . . . . . . . . . . . . . 202
Headlamp Aiming
Front Headlamp Aiming . . . . . . . . . . . . . . . 202
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . 202
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . 202
Front Turn Signal, Sidemarker, and Parking Lamps . . . . . . . . . . . . . . . . . . . . . . . 202
Taillamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Center High-Mounted Stoplamp (CHMSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
License Plate Lamp . . . . . . . . . . . . . . . . . . . . 204
Electrical System
Electrical System Overload . . . . . . . . . . . . 205
Fuses and Circuit Breakers . . . . . . . . . . . . . 205
Engine Compartment Fuse Block . . . . . . 206
Floor Console Fuse Block . . . . . . . . . . . . . . 209
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
All-Season Tires . . . . . . . . . . . . . . . . . . . . . . . . 211
Winter Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . 212 Tire Sidewall Labeling . . . . . . . . . . . . . . . . . . 212
Tire Designations . . . . . . . . . . . . . . . . . . . . . . 213
Tire Terminology and Definitions . . . . . . 214
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Tire Pressure Monitor System . . . . . . . . . . 217
Tire Pressure Monitor Operation . . . . . . . 217
Tire Inspection . . . . . . . . . . . . . . . . . . . . . . . . 220
Tire Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . 220
When It Is Time for New Tires . . . . . . . . 222
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . 222
Different Size Tires and Wheels . . . . . . . 224
Uniform Tire Quality Grading . . . . . . . . . 224
Wheel Alignment and Tire Balance . . . . 225
Wheel Replacement . . . . . . . . . . . . . . . . . . . 225
Tire Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
If a Tire Goes Flat . . . . . . . . . . . . . . . . . . . . . 226
Tire Changing . . . . . . . . . . . . . . . . . . . . . . . . . 228
Full-Size Spare Tire . . . . . . . . . . . . . . . . . . . . 235
Jump Starting
Jump Starting - North America . . . . . . . . 236
Towing the Vehicle
Towing the Vehicle . . . . . . . . . . . . . . . . . . . . 239
Recreational Vehicle Towing . . . . . . . . . . . 239
Appearance Care
Exterior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Interior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Vehicle Care 201
Automatic Transmission Shift Lock
Control Function Check
{Warning
When you are doing this inspection, the
vehicle could move suddenly. If the
vehicle moves, you or others could be
injured.
1. Before starting this check, be sure there is enough room around the vehicle.
It should be parked on a level surface.
2. Apply the parking brake. Be ready to apply the regular brake immediately if
the vehicle begins to move.
3. With the engine off, turn the ignition on, but do not start the engine. Without
applying the regular brake, try to move
the shift lever out of P (Park) with
normal effort. If the shift lever moves
out of P (Park), contact your dealer for
service.
Ignition Transmission Lock Check
While parked, and with the parking brake
set, try to turn the ignition off in each shift
lever position.
.The ignition should turn to off only when
the shift lever is in P (Park).
.The ignition key should come out only
when the ignition is off.
Contact your dealer if service is required.
Park Brake and P (Park)
Mechanism Check
{Warning
When you are doing this check, the
vehicle could begin to move. You or
others could be injured and property
could be damaged. Make sure there is
room in front of the vehicle in case it
begins to roll. Be ready to apply the
regular brake at once should the vehicle
begin to move.
Park on a fairly steep hill, with the vehicle
facing downhill. Keeping your foot on the
regular brake, set the parking brake.
.To check the parking brake's holding
ability: With the engine running and the
transmission in N (Neutral), slowly remove
foot pressure from the regular brake
pedal. Do this until the vehicle is held by
the parking brake only.
.To check the P (Park) mechanism's holding
ability: With the engine running, shift to
P (Park). Then release the parking brake
followed by the regular brake.
Contact your dealer if service is required.
Wiper Blade Replacement
Windshield wiper blades should be inspected
for wear and cracking. See Maintenance
Schedule 0249.
Replacement blades come in different types
and are removed in different ways. For
proper type and length, see Maintenance
Replacement Parts 0256.
Caution
Allowing the wiper arm to touch the
windshield when no wiper blade is
installed could damage the windshield.
Any damage that occurs would not be
covered by the vehicle warranty. Do not
allow the wiper arm to touch the
windshield.
1. Lift the wiper arm away from the windshield.

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Vehicle Care 207
FusesUsage
1 ABS motor
2 ABS module
3 Right trailer stoplamp/ Turn signal lamp
4 –
5 –
6 Fuel system control module/Ignition
7 Body control module 5
8 Body control module 7
9 Body control module 4
10 Instrument cluster 11 Trailer wiring
12 –
13 Interior rear vision camera module
14 Windshield washer
16 Horn 17 Transmission
18 A/C Fuses
Usage
19 Engine control module battery
20 Left stop/turn cutaway lamp
21 Left stop/turn trailer lamp
22 Right stop/turn cutaway lamp
23 NOX Sensor (Diesel only)
24 Fuel pump 25 Auxiliary power outlet
26 Body control module 3 27 Special equipment option
28 Airbag
29 Steering wheel sensor
30 Engine control module ignition
31 Transmission control module Ignition
32 Transmission control module 1 battery Fuses
Usage
33 Rear parking aid module
34 NOX Sensor (Diesel only)
35 Fuel heater control module (Diesel only)
36 Fuel system control module battery
41 Transmission control module 2, battery
signal
42 Trailer wiring
43 Electro viscous fan clutch (Diesel only)
44 Starter solenoid 45 Engine control module, powertrain signal 2
46 DC-AC inverter 47 –
51 Left high-beam headlamp
52 Right high-beam headlamp

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
208 Vehicle Care
FusesUsage
53 Left low-beam headlamp
54 Right low-beam headlamp
55 Wipers
56 Canister vent solenoid
58 Body control module 2
59 Body control module 1 61 Engine oil solenoid/ Crankcase vent heater
(Diesel only)
62 O2 sensor 2
63 –
64 Mass airflow/ Canister vent
65 Ignition coils/injectors - odd
66 Daytime running lamps 2
67 Daytime running lamps 1
68 Auxiliary stoplamps Fuses
Usage
69 External power for trailer
70 Upfitter stoplamps 71 Fuel heater/FlexFuel sensor
72 Body control module 6
73 Lighter/Data link connector
74 Front blower 75 Engine control module
76 Soot sensors (Diesel only)
77 O2 sensor 1
78 Engine control module/ Powertrain signal 1
79 Ignition coils/injectors - even
Relays Usage
15 Run/Crank
37 NOX Sensor (Diesel only) Relays
Usage
38 Fuel pump
39 Crank
40 A/C compressor 48 Electro viscous fan clutch (Diesel only)
49 Powertrain 50 –
57 –
60 –
Auxiliary Fuse Block

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
210 Vehicle Care
Mini-FusesUsage
F1 –
F2 Steering wheel sensor
F3 Auxiliary parking lamps
F4 Front parking lamps F5 Trailer parking lamps
F6 Upfitter/Parking lamps F7 Right rear parking lamp
F8 Left rear parking lamp
F9 Exterior rear mirror switch/ Door
lock-unlock control
upfitter/Front camera
module
F10 Airbag/Automatic occupant sensing
F11 –/OnStar
F12 –
F13 HVAC 2
F14 HVAC 1 F15 Reflected LED display
F16 Upfitter aux 1/Gas ambulance Mini-Fuses
Usage
F17 Heated outside mirrors
F18 Rear window defogger
F19 Compass
F20 Radio/Chime/SiriusXM satellite radio
F21 Remote function actuator/Tire pressure
monitor
F22 Ignition switch/Discrete logic ignition sensor
F23 Instrument cluster
F24 –
F25 HVAC control
F26 Auxiliary/Trailer reverse lamps
F27 Reverse tail lamps
F28 Upfitter 2/Reading lamps/Ambulance
F29 Rear blower
F30 Upfitter/Courtesy lamps F31 Front door lock
F32 Rear door lock Mini-Fuses
Usage
F33 Cargo door unlock
F34 Front passenger door unlock
F35 Rear passenger door unlock
F36 Driver door unlock F37 –
F38 –
Relays Usage
K1 Run
K2 –
K3 Parking lamps
K4 Upfitter 2 K5 Rear window defogger
K6 Retained accessory power
Circuit Breakers Usage CB1 Power seats
CB2 Power windows

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
218 Vehicle Care
the air pressure in the tires and transmit the
tire pressure readings to a receiver located
in the vehicle.
When a low tire pressure condition is
detected, the TPMS illuminates the low tire
pressure warning light located on the
instrument cluster. If the warning light
comes on, stop as soon as possible and
inflate the tires to the recommended
pressure shown on the Tire and Loading
Information label. SeeVehicle Load Limits
0 131.
A message to check the pressure in a
specific tire displays in the Driver
Information Center (DIC). The low tire
pressure warning light and the DIC warning
message come on at each ignition cycle
until the tires are inflated to the correct
inflation pressure. If the vehicle has DIC
buttons, tire pressure levels can be viewed.
For additional information and details about
the DIC operation and displays, see Driver
Information Center (DIC) 081. The low tire pressure warning light may
come on in cool weather when the vehicle is
first started, and then turn off as the vehicle
is driven. This could be an early indicator
that the air pressure is getting low and
needs to be inflated to the proper pressure.
A Tire and Loading Information label shows
the size of the original equipment tires and
the correct inflation pressure for the tires
when they are cold. See
Vehicle Load Limits
0 131, for an example of the Tire and
Loading Information label and its location.
Also see Tire Pressure 0216.
The TPMS can warn about a low tire
pressure condition but it does not replace
normal tire maintenance. See Tire Inspection
0 220, Tire Rotation 0220 and
Tires 0211.
Caution
Tire sealant materials are not all the
same. A non-approved tire sealant could
damage the TPMS sensors. TPMS sensor
damage caused by using an incorrect tire
sealant is not covered by the vehicle
warranty. Always use only the GM
approved tire sealant available through
your dealer or included in the vehicle.
TPMS Malfunction Light and Message
The TPMS will not function properly if one
or more of the TPMS sensors are missing or
inoperable. When the system detects a
malfunction, the low tire pressure warning
light flashes for about one minute and then
stays on for the remainder of the ignition
cycle. A DIC warning message also displays.
The malfunction light and DIC warning
message come on at each ignition cycle
until the problem is corrected. Some of the
conditions that can cause these to come
on are:
.One of the road tires has been replaced
with the spare tire. The spare tire does
not have a TPMS sensor. The malfunction
light and the DIC message should go off
after the road tire is replaced and the
sensor matching process is performed
successfully. See "TPMS Sensor Matching
Process" later in this section.
.The TPMS sensor matching process was
not done or not completed successfully
after rotating the tires. The malfunction
light and the DIC message should go off
after successfully completing the sensor
matching process. See "TPMS Sensor
Matching Process" later in this section.

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Vehicle Care 219
.One or more TPMS sensors are missing or
damaged. The malfunction light and the
DIC message should go off when the
TPMS sensors are installed and the sensor
matching process is performed
successfully. See your dealer for service.
.Replacement tires or wheels do not match
the original equipment tires or wheels.
Tires and wheels other than those
recommended could prevent the TPMS
from functioning properly. SeeBuying
New Tires 0222.
.Operating electronic devices or being near
facilities using radio wave frequencies
similar to the TPMS could cause the TPMS
sensors to malfunction.
If the TPMS is not functioning properly, it
cannot detect or signal a low tire pressure
condition. See your dealer for service if the
TPMS malfunction light and DIC message
come on and stay on.
TPMS Sensor Matching Process
Each TPMS sensor has a unique
identification code. The identification code
needs to be matched to a new tire/wheel
position after rotating the vehicle’s tires or
replacing one or more of the TPMS sensors.
Also, the TPMS sensor matching process should be performed after replacing a spare
tire with a road tire containing the TPMS
sensor. The malfunction light and the DIC
message should go off at the next ignition
cycle. The sensors are matched to the tire/
wheel positions, using a TPMS relearn tool,
in the following order: driver side front tire,
passenger side front tire, passenger side rear
tire, and driver side rear. See your dealer for
service or to purchase a relearn tool.
A TPMS relearn tool can also be purchased.
See Tire Pressure Monitor Sensor Activation
Tool at www.gmtoolsandequipment.com or
call 1-800-GM TOOLS (1-800-468-6657).
There are two minutes to match the first
tire/wheel position, and five minutes overall
to match all four tire/wheel positions. If it
takes longer, the matching process stops
and must be restarted.
The TPMS sensor matching process is:
1. Set the parking brake.
2. Turn the ignition on without starting the vehicle. See Ignition Positions 0135.
3. Press the Remote Keyless Entry (RKE) transmitter's
QandKbuttons at the
same time for approximately
five seconds. The horn sounds twice to signal the receiver is in relearn mode
and TIRE LEARNING ACTIVE message
displays on the DIC screen.
If the vehicle does not have RKE, press
the Driver Information Center (DIC)
vehicle information button until the
PRESS
VTO RELEARN TIRE POSITIONS
message displays. The horn sounds twice
to signal the receiver is in relearn mode
and TIRE LEARNING ACTIVE message
displays on the DIC screen.
4. Start with the driver side front tire.
5. Place the relearn tool against the tire sidewall, near the valve stem. Then press
the button to activate the TPMS sensor.
A horn chirp confirms that the sensor
identification code has been matched to
this tire and wheel position.
6. Proceed to the passenger side front tire, and repeat the procedure in Step 5.
7. Proceed to the passenger side rear tire, and repeat the procedure in Step 5.
8. Proceed to the driver side rear tire, and repeat the procedure in Step 5. The horn
sounds two times to indicate the sensor
identification code has been matched to
the driver side rear tire, and the TPMS
sensor matching process is no longer

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Vehicle Care 237
To avoid the possibility of the vehicles
rolling, set the parking brake firmly on
both vehicles involved in the jump start
procedure. Put an automatic transmission
in P (Park) or a manual transmission in
Neutral before setting the parking brake.
Caution
If any accessories are left on or plugged
in during the jump starting procedure,
they could be damaged. The repairs
would not be covered by the vehicle
warranty. Whenever possible, turn off or
unplug all accessories on either vehicle
when jump starting.
3. Turn the ignition off on both vehicles. Unplug unnecessary accessories plugged
into the cigarette lighter or the accessory
power outlet. Turn off the radio and all
lamps that are not needed. This will
avoid sparks and help save both
batteries. And it could save the radio!
4. Open the hoods and locate the positive (+) and negative (−) terminal
locations of the other vehicle.
On your van, use the unpainted radio
antenna bracket as a remote negative (−)
terminal.
{Warning
Using a match near a battery can cause
battery gas to explode. People have been
hurt doing this, and some have been
blinded. Use a flashlight if you need
more light.
Battery fluid contains acid that can burn
you. Do not get it on you. If you
accidentally get it in your eyes or on
your skin, flush the place with water and
get medical help immediately.
{Warning
Fans or other moving engine parts can
injure you badly. Keep your hands away
from moving parts once the engine is
running.
5. Check that the jumper cables do not have loose or missing insulation. If they
do, you could get a shock. The vehicles
could be damaged too.
Before you connect the cables, here are
some basic things you should know.
Positive (+) will go to positive (+) or to a
remote positive (+) terminal if the vehicle has one. Negative (−) will go to an
unpainted metal part or to a remote
negative (−) terminal if the vehicle has
one. On your van, use the unpainted
radio antenna bracket as a remote
negative (−) terminal.
Do not connect positive (+) to
negative (−) or you will get a short that
would damage the battery and maybe
other parts too. And do not connect the
negative (−) cable to the negative (−)
terminal on the dead battery because
this can cause sparks.
6. Connect the red positive (+) cable to the
positive (+) terminal of the dead battery.
Use a remote positive (+) terminal if the
vehicle has one. Do not let the other end

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
250 Service and Maintenance
help the longevity and efficient operation of
the air conditioning system. This service can
be complex. See your dealer.
Tire Rotation and Required Services
Every 12 000 km (7,500 mi)
Rotate the tires, if recommended for the
vehicle, and perform the following services.
SeeTire Rotation 0220.
.Check engine oil level and oil
life percentage. If needed, change engine
oil and filter, and reset oil life system.
See Engine Oil 0184 and
Engine Oil Life System 0186.
.Check engine coolant level. See Cooling
System 0191.
.Check windshield washer fluid level. See
Washer Fluid 0196.
.Check tire inflation pressures, including
the spare. See Tire Pressure0216.
.Inspect tire wear. See Tire Inspection
0 220.
.Visually check for fluid leaks.
.Inspect engine air cleaner filter. See
Engine Air Cleaner/Filter 0189.
.Inspect brake system. See Exterior Care
0 241.
.Visually inspect steering, suspension, and
chassis components for damage, including
cracks or tears in the rubber boots, loose
or missing parts, or signs of wear at least
once a year. See Exterior Care0241.
.Inspect power steering for proper
attachment, connections, binding, leaks,
cracks, chafing, etc.
.Visually inspect halfshafts and drive
shafts for excessive wear, lubricant leaks,
and/or damage including: tube dents or
cracks, constant velocity joint or universal
joint looseness, cracked or missing boots,
loose or missing boot clamps, center
bearing excessive looseness, loose or
missing fasteners, and axle seal leaks.
.Check restraint system components. See
Safety System Check 035.
.Visually inspect fuel system for damage
or leaks.
.Visually inspect exhaust system and
nearby heat shields for loose or damaged
parts.
.Lubricate body components. See Exterior
Care 0241.
.Check starter switch. See Starter Switch
Check 0200.
.Check automatic transmission shift lock
control function. See Automatic
Transmission Shift Lock Control Function
Check 0201.
.Check ignition transmission lock. See
Ignition Transmission Lock Check 0201.
.Check parking brake and automatic
transmission park mechanism. See Park
Brake and P (Park) Mechanism Check
0 201.
.Check accelerator pedal for damage, high
effort, or binding. Replace if needed.
.Lubricate the steering linkage (greasable
joints). See Normal and Severe
Maintenance Schedules. For severe
commercial use vehicles, see Special
Application Services 0253.
.Visually inspect the spare tire to ensure
that it is tightly stowed under the vehicle.
Push, pull, and try to turn the tire. If the
spare tire moves, tighten as necessary.
See Tire Changing 0228.

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
274 OnStar
.Receive a Diagnostic check of the vehicle's
key operating systems.
.Receive Roadside Assistance.
.Manage Wi-Fi Settings, if equipped.
Press
>to get a priority connection to an
OnStar Advisor available 24/7 to:
.Get help for an emergency.
.Be a Good Samaritan or respond to an
AMBER Alert.
.Get assistance in severe weather or other
crisis situations and find evacuation
routes.
OnStar Services
Emergency
Emergency Services require an active safety
and security plan. With Automatic Crash
Response, built-in sensors can automatically
alert a specially trained OnStar Advisor who
is immediately connected in to the vehicle
to help.
Press
>for a priority connection to an
OnStar Advisor who can contact emergency
service providers, direct them to your exact
location, and relay important information. With OnStar Crisis Assist, specially trained
Advisors are available 24 hours a day, 7 days
a week, to provide a central point of
contact, assistance, and information during a
crisis.
With Roadside Assistance, Advisors can
locate a nearby service provider to help with
a flat tire, a battery jump, or an empty
gas tank.
Security
If equipped, OnStar provides these services:
.With Stolen Vehicle Assistance, OnStar
Advisors can use GPS to pinpoint the
vehicle and help authorities quickly
recover it.
.With Remote Ignition Block, if equipped,
OnStar can block the engine from being
restarted.
.With Stolen Vehicle Slowdown,
if equipped, OnStar can work with law
enforcement to gradually slow the
vehicle down.
Theft Alarm Notification
If equipped, if the doors are locked and the
vehicle alarm sounds, a notification by text,
e-mail, or phone call will be sent. If the
vehicle is stolen, an OnStar Advisor can work
with authorities to recover the vehicle.
OnStar Additional
Information
In-Vehicle Audio Messages
Audio messages may play important
information at the following times:
.Prior to vehicle purchase. PressQto set
up an account.
.After change in ownership and at
90 days.
Transferring Service
PressQto request account transfer
eligibility information. The Advisor can
cancel or change account information.
Selling/Transferring the Vehicle
Call 1-888-4ONSTAR (1-888-466-7827)
immediately to terminate your OnStar or
connected services if the vehicle is disposed
of, sold, transferred, or if the lease ends.