2019 Hyundai Nexo Owner's Manual

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CategoryQuestionsAnswers
Vehicle
Management (12 items)
11. Can I wash my FCEV with pressurized water? What if water flows into the fuel
cell power module compartment?
Every component housed in the fuel cell power module compart-
ment is designed to be waterproof like those found in standard vehi-
cles. Therefore, a short circuit of the FCEV cannot happen while
washing the car. However, your FCEV works by utilizing high-voltage
electric power, so it is recommended that you avoid high-pressure car
washes. If the insulation resistance of the FCEV deteriorates due to
car wash, a High voltage warning light may turn on the cluster.

12. When washing the fuel cell power mod-ule compartment, is there any potential
risk of electric shock resulting from a
high-voltage short circuit?The FCEV is designed to be a waterproof structure, but please
avoid washing the inside of the compartment if possible. Because
there are many high voltage parts in the power module compart-
ment.
13. Can I wash the bottom of the vehicle? Ifyes, what should I be aware of?The FCEV is designed to be a waterproof structure, but please
avoid washing the botttom of the vehicle if possible. Because there
are high voltage cables in the under cover.
14. Can driving with a tire chain affect thedrive motor?Driving with a tire chain causes no direct damage to the drive motor.
15. How should I jump start the vehicle?
Try charging it by pressing the "12V BATT RESET" button first.
Refer to the "If the 12 volt battery is discharged" in this guide book.
It it doesn't work, refer to the "Jump starting" in the Owner's manual
chapter 6.

H34
CategoryQuestionsAnswers
Vehicle
Management (12 items)
16. Does the FCEV use a different coolant type from that of standard vehicles?
(Difference between Stack cooling
coolant and Device cooling coolant.)
Stack cooling coolant is an exclusive coolant for the fuel cell, which
is characterized by its use of a non-ionic anti-corrosion agent (an
additive) and very low electric conductivity. In comparison, the
device cooling coolant is a coolant similar to that used in standard
vehicles and has a very high electric conductivity.
If the stack cooling coolant is used with the electrical cooling sys-
tem, it will corrode the electrical system parts. If the device cooling
coolant is used with the fuel cell cooling system, it will damage the
system insulation resistor due to high electric conductivity. This car-
ries the additional risk of shocking the driver (electric shock).
17. What should I be aware of when park-ing the vehicle? Can I park the FCEV in
an enclosed underground parking lot?
(Risk of hydrogen gas leak.)
Hydrogen gas supply is cutoff after Power-OFF to prevent the hydro-
gen gas from leaking.
18. If the FCEV will be parked for a longperiod, what should I do?
For long-term parking situations, a high-voltage battery will gradually
lose its charge [low SOC(State Of Charge)], potentially causing igni-
tion failure.
1. In order to minimize the discharge of the high-voltage battery, turnoff the power using the POWER button and disconnect the (-) ter-
minal of the auxiliary battery (12 V) from the vehicle.
2. To recharge the high-voltage battery, it is recommended that you drive your FCEV two or three times a month, for no less than 10
minutes or 2 miles (3 km) during each session.
3. If the vehicle does not startup, press the "12V BATT RESET" but- ton or jump start the vehicle. Otherwise contact an authorized
HYUNDAI dealer.
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CategoryQuestionsAnswers
Vehicle
Management (12 items)
19. What are the do-it-yourself (DIY) main- tenance items for the FCEV?
DIY Check: Device cooling coolant, Stack cooling coolant, Brake
Fluid, Tire and Wheels
DIY Maintenance: Washer fluid, Air cleaner, Climate control air filter,
Wiper blades, Fuse, Light bulb
20. What should I be aware of when doingDIY maintenance work?Be careful not to touch the high-voltage cable (orange color),
coolant, and ion filter.
21. Tell me what the potential effects are ofparking long-term in a cold area (-4 °F
(-20 °C)) for the FCEV, and whether or
not the vehicle can startup under such
conditions.In most instances, the vehicle can get startup in cold weather with-
out any problems. However, the vehicle may not start if it is parked
with the power off for over a week in cold temperatures. In this case,
If you will not be turning on the vehicle for more than a week in cold
weather, it is recommended that you park the vehicle inside a build-
ing, if possible.
22. What parts must I not touch withhands? For example, high-voltage
cable, ion filter, etc.?
High-voltage cable (orange color), ion filter, parts with a high voltage
warning sticker.
Also, never touch the hydrogen storage system under the liftgate,
the hydrogen supply pipe under the vehicle and the hydrogen supply
system components on the right side (based on the driver’s position)
of the hood.

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, contact an authorized HYUNDAI dealer for
service.
24. Can I keep driving the vehicle even ifthe 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, contact an authorized HYUNDAI dealer for service.
25. While driving to a service center afterthe 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, please contact an authorized
HYUNDAI dealer for service.
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CategoryQuestionsAnswers
Cluster/
Warning Lamp (9 items)
27. What should I do if the service warning light turns on?If the service warning light turns on during "READY" status or in driv-
ing mode, it may indicate a malfunction in operation with any fuel cell
system. Please contact an authorized HYUNDAI dealer for service.
28. What should I do if the master warninglight turns on?If the service warning light turns on when there is a malfuction in
operation in any of the vehicle systems. Please look at the LCD dis-
play for details and contact an authorized HYUNDAI dealer for service
if needed.
29. How much farther (roughly) can I drivemy FCEV when the fuel warning light
turns on? (Remaining mileage)You can continue driving for an additional 40~55 miles (70~90 km).
It may depend on driving mode.
30. When restarting the vehicle, the " "indicator turns on on the cluster. What
does this mean?It means that the fuel cell system is working in good order and your
car is ready to drive.
31. Why does the vehicle’s hydrogen tankhave a life expectancy?
The hydrogen tank is frequently refueled with the high pressure
hydrogen gas and the number of times refueling the vehicle is limit-
ed to 5,000 times (or 15 years). The hydrogen storage system
counts the number of times the vehicle is refueled and turns on the
warning light when the vehicle is refueled for over 4,995 times.
Every time the vehicle is turned on the warning message "Replace
hydrogen tank. Maximum number of refill cycles exceeded" is dis-
played on the cluster. The vehicle can be driven about 1-3 million
kilometers until the vehicle is refueled 5,000 times, meaning that the
hydrogen tank is used semi-permanently under common driving
condition.

H38
CategoryQuestionsAnswers
HydrogenSystem
(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, 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.
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H39
CategoryQuestionsAnswers
HydrogenSystem
(7 items)
35. In the beginning, when driving the new vehicle, I hear hissing sounds regularly
from the hood while the vehicle is
stopped. Is this noise cause for con-
cern?
In the beginning, the purity of hydrogen in the hydrogen tank of the
new vehicle may be somewhat low. It is a normal noise which
occurs when the system discharges the hydrogen more frequently
compensating the low hydrogen purity. The fuel efficiency of the new
vehicle may be low in the beginning due to the frequent hydrogen
discharge. However, this is a normal condition. In general, the hydro-
gen purity returns to normal range after refueling 3-4 times.

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CategoryQuestionsAnswers
Hydrogen
System
(7 items)36. How should I refuel the tank with hydro- gen gas? And what should I take care
of?
* Close the fuel cap and fuel filler door firmly.
* The gas tank may not be fully filled depending on the conditions ofthe hydrogen station.
* Carefully read any precautions about refueling at hydrogen gas stations.
* Be careful not to cause static electricity when touching the fuel filler with your hand. (To avoid static electricity, be sure to touch
your bare hand on something metallic as far from the fuel filler as
possible.)
* DO NOT get out of, or go into, your car while the gas tank is being refueled.
* DO NOT use any mobile device. Fire may occur due to electric current / radio wave from the mobile device.
* Make sure that the fuel cell system stops working before refueling the gas tank.
* DO NOT smoke a cigarette or strike a lighter while refueling the gas tank.
* If you need assistance with refueling the gas tank after completely consuming all the available fuel in the vehicle, please contact an
authorized HYUNDAI dealer.