2021 CHEVROLET COLORADO light

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Vehicle Care 67
FusesUsage
F46 Cooling fan clutch F47 Heater crankcase ventilation
F48 Fog lamps
F49 Selective catalytic reduction power module wake up
F50 Trailer parking lamps F51 Horn
F52 –
F53 –
F54 –
F55 –
F56 Washer pump F57 –
F58 –
F59 –
F60 Mirror defogger F61 –
F62 Selective catalytic reduction power module
F63 – Fuses
Usage
F64 Trailer reverse lamps F65 Left trailer stoplamp/ Turnlamp
F66 Right trailer stoplamp/ Turnlamp
F67 Electric power steering
F68 –
F69 Battery regulated voltage control
F70 –
F71 –
F72 –
F73 –
F74 Generator F75 –
Relays Usage
K1 Air conditioning clutch
K2 Starter
K3 Powertrain sensor
K4 Wiper speed Relays
Usage
K5 Wiper control
K6 Cargo lamp/Bed lighting K7 Powertrain
K8 Fuel pump
K9 Front differential lock actuators
K10 Rear differential lock actuators
K11 Center high-mounted stoplamp
K12 Fuel heater
K13 Selective catalytic reduction power
module heater control/
Diesel exhaust fluid
control
K14 Trailer parking lamps K15 Run/Crank
K16 Cooling fan clutch K17 Rear window defogger/ Mirror defogger

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
70 Vehicle Care
FusesUsage
52 Right high-beam headlamp
53 Left low-beam headamp
54 Right low-beam headlamp
55 Wipers
56 Canister vent solenoid
58 Body control module 2
59 Body control module 1 61 Crankcase vent heater
62 O2 sensor 2/EV fan
63 –
64 Mass airflow sensor/ Canister vent/Humidity
sensor
65 Ignition coils/injectors - odd
66 Daytime running lamps 2
67 Daytime running lamps 1–uplevel
68 Auxiliary stoplamps Fuses
Usage
69 Trailer power extension 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, powertrain signal 3
76 Soot sensor 77 O2 sensor 1/ECM powertrain signal 2
78 Engine control module/ Powertrain
79 Ignition coils/injectors - even
Relays Usage
15 Run/Crank
37 NOx sensors
38 Fuel pump Relays
Usage
39 Crank
40 Air conditioning 48 EV fan clutch
49 Powertrain 50 –
57 Cooling fan –low
60 Cooling fan control
Auxiliary Fuse Block
The vehicle may not be equipped with all of
the fuses, relays, and features shown.

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Index 85
IndexA
Accessories and Modifications . . . . . . . . . . . . .52
Air Cleaner/Filter, Engine . . . . . . . . . . . . . . . . . 58
Appearance CareExterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . . . . . 58
B
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
BrakeExhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
C
Canadian Vehicle Owners . . . . . . . . . . . . . . . . . . . 1
Capacities and Specifications . . . . . . . . . . . . . . 82
CheckEngine Light (Malfunction Indicator) . . . . . 9
Cleaning Exterior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Cluster, Instrument . . . . . . . . . . . . . . . . . . . . . . . . 4
Cold Weather Operation . . . . . . . . . . . . . . . . . . .27
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Covers Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
D
DieselStarting Your Engine . . . . . . . . . . . . . . . . . . . . . 13
Diesel Exhaust Fluid . . . . . . . . . . . . . . . . . . . . . . .22
Diesel Exhaust Fluid (DEF) Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Diesel Particulate Filter . . . . . . . . . . . . . . . . . . . .19
Drive Belt Routing, Engine . . . . . . . . . . . . . . . . 84
Driver Information Center (DIC) . . . . . . . . . . . 10
E
Electrical System Engine Compartment Fuse Block . . . . . . . . 64
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . . . . . . . 58
Check Light (Malfunction Indicator) . . . . . . 9
Compartment Overview . . . . . . . . . . . . . . . . . 53
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . 60
Drive Belt Routing . . . . . . . . . . . . . . . . . . . . . . 84
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . . 58
Oil Pressure Gauge . . . . . . . . . . . . . . . . . . . . . . 8
Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Starting Your Diesel . . . . . . . . . . . . . . . . . . . . . 13
Engines Diesel Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Exhaust Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
86 Index
Exhaust FluidDiesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
F
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Replacement (Fuel) . . . . . . . . . . . . . . . . . . . . . 30
Filter,
Engine Air Cleaner . . . . . . . . . . . . . . . . . . . . . . 58
Fluid Automatic Transmission . . . . . . . . . . . . . . . . 58
Fuel Additives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Cold Weather Operation . . . . . . . . . . . . . . . . 27
Diesel Engines . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Filling a Portable Fuel Container . . . . . . . . 34
Filling the Tank . . . . . . . . . . . . . . . . . . . . . . . . . 32
Filter Replacement . . . . . . . . . . . . . . . . . . . . . . 30
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operated Heater (FOH) . . . . . . . . . . . . . . . . . 19
Running out of Fuel . . . . . . . . . . . . . . . . . . . . 30
Top Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Water in Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Fuel for Diesel Engines . . . . . . . . . . . . . . . . . . . . .25
Fuses Engine Compartment Fuse Block . . . . . . . . 64
G
Gauges
Engine Oil Pressure . . . . . . . . . . . . . . . . . . . . . . 8
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Information
Service and Maintenance . . . . . . . . . . . . . . . 72
H
HeaterEngine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Fuel Operated . . . . . . . . . . . . . . . . . . . . . . . . . . 19
I
Instrument Cluster . . . . . . . . . . . . . . . . . . . . . . . . . 4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
L
LampsMalfunction Indicator (Check Engine) . . . . 9
Lights Check Engine (Malfunction Indicator) . . . . 9
Diesel Exhaust Fluid (DEF) . . . . . . . . . . . . . . 10
Power Take-off . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Wait to Start . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
M
Maintenance
Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Maintenance Schedule . . . . . . . . . . . . . . . . . 73, 77 Maintenance Schedule (cont'd)
Recommended Fluids and Lubricants . . . . 78
Malfunction Indicator Lamp . . . . . . . . . . . . . . . . 9
O
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Engine Oil Life System . . . . . . . . . . . . . . . . . . 58
Engine Oil Pressure Gauge . . . . . . . . . . . . . . . 8
Overheating, Engine . . . . . . . . . . . . . . . . . . . . . . 62
P
Parking Over Things That Burn . . . . . . . . . . . . . . . . . . 19
Personalization Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Take-Off (PTO) . . . . . . . . . . . . . . . . . . . . . .37
Power Take-Off Light . . . . . . . . . . . . . . . . . . . . . 10
R
Recommended Fluids and Lubricants . . . . . . 78
Records Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Replacement Parts Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Routing, Engine Drive Belt . . . . . . . . . . . . . . . . 84
Running out of Fuel . . . . . . . . . . . . . . . . . . . . . . 30

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Index 87
S
ServiceAccessories and Modifications . . . . . . . . . . 52
Maintenance Records . . . . . . . . . . . . . . . . . . . 80
Maintenance, General Information . . . . . . 72
Specifications and Capacities . . . . . . . . . . . . . . 82
Starting the Diesel Engine . . . . . . . . . . . . . . . . . 13
Supplement Using . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
T
Top Tier Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
TowingTrailer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Trailer
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Transmission Fluid, Automatic . . . . . . . . . . . . . . . . . . . . . . . . 58
U
Using This Supplement . . . . . . . . . . . . . . . . . . . . .2
V
VehicleCanadian Owners . . . . . . . . . . . . . . . . . . . . . . . . . 1
Personalization . . . . . . . . . . . . . . . . . . . . . . . . . . 11
W
Wait to Start Light . . . . . . . . . . . . . . . . . . . . . . . 10
Water in Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Winter Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16