2021 HYUNDAI NEXO battery

H36
CategoryQuestionsAnswers
Cluster/
Warning Lamp
(9 items)
23. What shall I do if the hydrogen gas leak
warning light turns on on the cluster?
(Red)If the hydrogen gas leak warning light turns on during "READY" sta-
tus or in driving mode, this indicates a hydrogen gas leak inside the
vehicle. DO NOT lose your composure. Park your vehicle and turn
OFF the vehicle. Then, we recommend that you contact an author-
ized HYUNDAI dealer for service.
24. Can I keep driving the vehicle even if
the hydrogen gas leak warning light
turns on on the cluster?
(Red)The fuel cell stops working if hydrogen is no longer available. However,
the FCEV can run for an additional distance (About 2 miles (3 km)) in
EV mode where the vehicle runs only on battery power. Mileage in EV
mode can vary depending on the "state of charge" (SOC) of the high
voltage battery, so move your vehicle to the nearest shoulder on the
road. Then, we recommend that you contact an authorized HYUNDAI
dealer for service.
25. While driving to a service center after
the hydrogen gas leak warning light
turns on on the cluster, is it possible
that the vehicle catch fire if there is
something nearby to ignite the leaking
gas (cigarette butt, etc.)?
(Red)
As soon as the hydrogen gas leak warning light appears, the fuel
cell operation is disabled immediately to cut the supply of hydrogen.
This prevents the possibility of a fire occurring.
26. What should I do if a power down warn-
ing light turns on?If the power down warning light turns on during "READY" status or
in driving mode, power supply to the fuel cell system is cut off. If the
warning light turns on repeatedly when restarting the vehicle after
parking your car on the safe place, we recommend that you contact
an authorized HYUNDAI dealer for service.
C CU
US
ST
TO
OM
ME
ER
R
Q
Q&
&A
A
G
GU
UI
ID
DE
E
(
(C
CO
ON
NT
T.
.)
)

H38
CategoryQuestionsAnswers
Hydrogen
System
(7 items)
32. What happens if hydrogen in the hydro-
gen tank is completely consumed?
The fuel cell stops working if hydrogen is no longer available.
However, the FCEV can run for an additional distance (About 2
miles (3 km)) in EV mode where the vehicle runs only on battery
power. Mileage in EV mode can vary depending on the "status of
charge" (SOC) of the high voltage battery, so move your vehicle to
the nearest shoulder on the road. Then, we recommend that you
contact an authorized HYUNDAI dealer for service.
33. If the hydrogen gas tank is fully refu-
eled, how much farther can the FCEV
run?It can travel as far as 300~370 miles (500~600 km) at a constant
vehicle speed of 50 mph(80 kph). Realistically though, this travel
distance is shorter due to normal acceleration and deceleration
when driving.
34. Which mechanism allows for the hydro-
gen gas tank to be refueled, and is it
possible to refuel the tank as much as
you need? Is it possible that the tank
may not be fully refueled?
The tank is refueled by utilizing the difference in hydrogen pressure
between the refueling station and the vehicle. When refueling, the
hydrogen gas pressure of the refueling station is higher than that of
the vehicle. The act of refueling can be stopped as desired.
Normally, the gas tank is not fully refueled with hydrogen if the sta-
tion's hydrogen pressure is not sufficiently high, or if the station sys-
tem cannot communicate with the vehicle.
❈System and the vehicle communicates the temperature and pres-
sure of hydrogen gas via wireless network.
C CU
US
ST
TO
OM
ME
ER
R
Q
Q&
&A
A
G
GU
UI
ID
DE
E
(
(C
CO
ON
NT
T.
.)
)

H42
CategoryQuestionsAnswers
Fuel Cell
Stack/High
Voltage
Battery
(4 items)
39. What happens if hydrogen gas leaks
from the fuel cell stack?
(Red)If hydrogen gas leaks beyond what's tolerable from the fuel cell stack,
a hydrogen sensor installed in the system detects the leak and in
response, turns ON the hydrogen gas leak warning light in the cluster.
40. Can the fuel cell stack explode or burn
out due to overheating?The fuel cell stack passed a high temperature test and is deemed
safe, so it is unlikely to explode.
41. Which symptoms occur if the fuel cell
system malfunctions?
If the fuel cell system malfunctions, warning lights specific to the
actual problem appear on the LCD display. When this happens, the
vehicle speed may be limited, or the fuel cell system may shut
down. DO NOT lose your composure if this happens. Park your vehi-
cle and turn OFF the vehicle. Then, we recommend that you contact
an authorized HYUNDAI dealer for service.
42. Is the recharge performance of the high
voltage battery reduced depending on
its length of use? Like any vehicle component, the high voltage battery will decrease
in performance as it ages over time. However, the high voltage bat-
tery of the FCEV is durable enough to work at peak performance
beyond the warranty period.
C CU
US
ST
TO
OM
ME
ER
R
Q
Q&
&A
A
G
GU
UI
ID
DE
E
(
(C
CO
ON
NT
T.
.)
)

H43
CategoryQuestionsAnswers
Vehicle
Accidents/
Towing
(5 items)
43. Is there a risk of electric shock from the
high-voltage parts in the event of a colli-
sion or accident?
The FCEV is designed to detect impact events during a collision or
accident so that the hydrogen gas supply is immediately cutoff. Also,
the high-voltage relay is activated to cutoff the supply of electric power
to the fuel cell stack and high-voltage battery. Moreover, the FCEV
satisfies international electrical safety standards for collisions and
accidents.
44. Should I take any special safety precau-
tions in the event of a collision or acci-
dent?
Despite the uniqueness of the hydrogen FCEV, you do not have to
take any special safety precautions in the event of a minor collision or
accident. In the event of a minor accident, turn off the vehicle to cutoff
the supply of electric power and hydrogen gas. Also, the FCEV is
equipped with collision sensors at the front and rear of the vehicle so
those sensors are activated during an actual collision to automatically
cutoff the supply of power and hydrogen to ensure driver and passen-
ger safety. For other situations, follow the same procedures as you
would with a standard vehicle. Depending on the severity of the colli-
sion or accident, take appropriate measures.
45. Is a high-voltage battery designed to
ensure occupant safety? Can it explode
from a collision?Our battery packs are designed to prevent any explosion due to
physical impact or damage, and they fully satisfy international safety
standards.

I-2
12V battery......................................................................7-27
Battery recharging ......................................................7-28
Reset Features ............................................................7-28
AC Inverter ...................................................................3-167
Accessing Your Vehicle ....................................................3-3
Smart Key.....................................................................3-3
Immobilizer System .....................................................3-9
Active Hood Lift System ................................................2-70
System activation .......................................................2-70
System limitation........................................................2-71
System malfunction ....................................................2-72
Air Bag - Advanced Supplemental Restraint System.....2-47
Where Are the Air Bags? ...........................................2-49
How Does the Air Bag System Operate? ...................2-52
What to Expect After an Air Bag Inflates ..................2-57
Occupant Classification System (OCS) .....................2-58
Why Didn't My Air Bag Go Off in a Collision?........2-60
SRS Care ....................................................................2-60
Additional Safety Precautions ....................................2-60
Air Bag Warning Labels.............................................2-60
Why Didn't My Air Bag Go Off in a Collision?........2-63
SRS Care ....................................................................2-68
Additional Safety Precautions ....................................2-69
Air Bag Warning Labels.............................................2-69Air Bag Warning Labels .................................................2-69
Air cleaner.......................................................................7-20
Filter Replacement .....................................................7-20
Air Conditioning System ..................................................8-5
Anti-lock Brake System (ABS) ......................................5-29
Appearance care..............................................................7-62
Exterior Care ..............................................................7-62
Interior Care ...............................................................7-67
Auto Hold .......................................................................5-25
Automatic Climate Control System..............................3-147
Automatic Temperature Control Mode ....................3-148
Manual Temperature Control Mode .........................3-148
System Operation .....................................................3-155
System Maintenance ................................................3-156
Before Driving ..................................................................5-4
Before Entering the Vehicle .........................................5-4
Before Starting .............................................................5-4
Blind-Spot Collision Warning/
Blind-Spot Collision-avoidance Assist ........................5-53
System Description ....................................................5-53
System Setting and Activation ...................................5-54
Warning and System Control .....................................5-57
Detecting Sensor (Front View Camera and
Rear Corner Radar) .................................................5-59
Limitations of the System ..........................................5-62
Index
A
B

I-4
Driver Assist System.....................................................3-105
Parking Distance Warning (Reverse/Forward)
System ...................................................................3-105
Rear View Monitor ...................................................3-109
Surround View Monitoring ......................................3-110
Driver Attention Warning (DAW) System......................5-94
System Setting and Activation ...................................5-94
Resetting the System ..................................................5-95
System Standby ..........................................................5-96
System Malfunction ...................................................5-96
Electric Power Steering (EPS) ........................................3-20
Electronic Parking Brake (EPB) .....................................5-19
Electronic Stability Control (ESC) .................................5-31
Emergency Fuel Filler Door Release..............................3-57
Explanation of scheduled maintenance items.................7-12
Exterior Care ...................................................................7-62
Exterior Features .............................................................3-42
Hood ...........................................................................3-42
Non-Powered Liftgate ................................................3-43
Power Liftgate ............................................................3-45
Smart Liftgate.............................................................3-51
Fuel Filler Door ..........................................................3-55
Emergency Fuel Filler Door Release .........................3-57Exterior Features ...........................................................3-176
Roof Side Rails ........................................................3-176
Exterior Lights ................................................................3-89
Exterior Overview.............................................................1-2
Features of FCEV............................................................H10
How to Start the Vehicle .............................................H10
How to Stop the Vehicle .............................................H11
Virtual Engine Sound System .....................................H11
Fuel filler door ............................................................H12
Warning and indicator lights.......................................H15
LCD Display Messages ..............................................H16
FCEV mode ................................................................H21
When the high voltage battery is weak ......................H25
If the 12 volt battery is discharged .............................H25
Emergency while driving............................................H26
Floor Mat Anchor(s) .....................................................3-172
Forward Collision-avoidance Assist (FCA) System.......5-39
System Setting and Activation ...................................5-39
FCA Warning Message and System Control..............5-41
FCA Sensor (Front Radar/Front View Camera).........5-44
System Malfunction ...................................................5-46
Limitations of the System ..........................................5-47
Index
E
F

I-5
Front Seats ........................................................................2-6
Front Windshield Washers ............................................3-102
Front Windshield Wipers ..............................................3-101
Fuel Cell Power Module Compartment ............................1-6
Fuel cell power module compartment ..............................7-3
Fuel Filler Door ..............................................................3-55
Fuel cell stack....................................................................H4
Fuses ...............................................................................7-45
Instrument Panel Fuse Replacement ..........................7-46
Fuel cell power module compartment
Panel Fuse Replacement .........................................7-47
Fuse/Relay Panel Description ....................................7-49
Glove Box .....................................................................3-163
Good Braking Practices ..................................................5-36
Hazard Warning Flasher ...................................................6-2
Head Restraints ...............................................................2-13
Heated Steering Wheel ...................................................3-22
High pressure hydrogen storage tanks ..............................H5
Hill-Start Assist Control (HAC) .....................................5-36
Hood................................................................................3-42
Horn ................................................................................3-21If the 12 Volt Battery is Discharged .................................6-5
Before Jump Starting....................................................6-5
Jump Starting................................................................6-6
If the Vehicle Overheats....................................................6-9
If the Vehicle Will Not Start .............................................6-4
If You Have a Flat Tire (With Tire Mobility Kit)...........6-17
Immobilizer System ..........................................................3-9
Important Safety Precautions............................................2-2
Always Wear Your Seat Belt ........................................2-2
Restrain All Children....................................................2-2
Air Bag Hazards ...........................................................2-2
Driver Distraction.........................................................2-2
Control Your Speed ......................................................2-3
Keep Your Vehicle in Safe Condition ..........................2-3
In Case of an Emergency While Driving .........................6-2
If an accident occurs.....................................................6-2
If a fire occurs ..............................................................6-3
Emergency venting of hydrogen gas ............................6-3
If a submersion in water occurs ...................................6-3
If the vehicle stalls at a crossroad or crossing .............6-3
If you have a flat tire while driving .............................6-4
If the vehicle stalls while driving .................................6-4
Inside Rearview Mirror...................................................3-23
I
Index
G
H
I

I-9
Smart Cruise Control Vehicle-to-Vehicle Distance ..5-105
Sensor to Detect Distance to the Vehicle Ahead ......5-108
Limitations of the System ........................................5-110
Smart Key .........................................................................3-3
Smart Liftgate .................................................................3-51
Snow Tires ......................................................................7-42
Special Driving Conditions ...........................................5-118
Hazardous Driving Conditions .................................5-118
Rocking the Vehicle..................................................5-118
Smooth Cornering ....................................................5-119
Driving at Night........................................................5-119
Driving in the Rain ...................................................5-119
Driving in Flooded Areas .........................................5-120
Highway Driving ......................................................5-120
Reducing the Risk of a Rollover ..............................5-121
Stack cooling coolant ......................................................7-16
Checking the Coolant Level .......................................7-16
Changing Coolant.......................................................7-18
Steering Wheel ................................................................3-20
Electric Power Steering (EPS) ...................................3-20
Tilt Steering/Telescope Steering.................................3-21
Horn ............................................................................3-22
Heated Steering Wheel ...............................................3-22
Storage Compartment ...................................................3-163
Center Console Storage ............................................3-163
Glove Box ................................................................3-163Sunroof............................................................................3-37
Sunroof Opening and Closing ....................................3-38
Sliding the Sunroof ....................................................3-38
Tilting the Sunroof .....................................................3-39
Sunshade.....................................................................3-39
Resetting the Sunroof .................................................3-40
Sunroof Open Warning...............................................3-41
Sunvisor ........................................................................3-164
Surround View Monitoring ...........................................3-110
The components of FCEV.................................................H3
FCEV system module ...................................................H4
High pressure hydrogen storage tanks..........................H5
Battery system ..............................................................H5
Theft-Alarm System .......................................................3-19
Tilt Steering/Telescope Steering .....................................3-21
Tire Pressure Monitoring System (TPMS) .....................6-11
Check Tire Pressure ....................................................6-11
Tire Pressure Monitoring System...............................6-12
Low Tire Pressure Telltale..........................................6-13
Low Tire Pressure LCD Display with Position
Indicator ..................................................................6-13
TPMS Malfunction Indicator .....................................6-14
Changing a Tire with TPMS ......................................6-15
Tire Specification and Pressure Label ..............................8-8
I
Index
T