GROUP

NUMBER

CAMPAIGN

Technical Service Bulletin
SUBJECT:

DATE

21-01-048H

MODEL

June, 2021

ELANTRA (CN7)

WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR
(SERVICE CAMPAIGN T6Q)

*** Dealer Stock and Retail Vehicles ***
Dealers must perform this Service Campaign on all affected vehicles prior to customer retail delivery
and whenever an affected vehicle is in the shop for any maintenance or repair.
When a vehicle arrives at the Service Department, access Hyundai Motor America's "Warranty
Vehicle Information" screen via WEBDCS to identify open Campaigns.

Description: On certain 2021-2022 Elantra vehicles, a coolant leak at the Water Temperature
Sensor (WTS) may be observed due to machining burrs at the mounting port of the cylinder head,
resulting in improper coolant sealing.
Follow the inspection procedure outlined in this bulletin to check the cylinder head for signs of
coolant leaks. If coolant leak is found, perform the service procedure to repair the burr at the
mounting port and to replace the WTS to complete the repair.
APPLICABLE VEHICLES: Certain 2021-2022 Elantra (CN7) vehicles with 2.0L Nu engines
Parts Information:
PART NAME

PART NUMBER

400 Grit
Sand Paper

(Commercially
Available)

FIGURE

NOTE

(ONLY FOR LEAK REPAIR)

Water
Temperature
Sensor (WTS)

Cut the sand paper sheet into
4” x 4” pieces for each use.

(ONLY FOR LEAK REPAIR)
39220-2J100

IMPORTANT: Do not replace
the WTS if no leaks are found.

NOTE: Do not order the WTS without confirming that a coolant leak is found during inspection.
Circulate To: Service Manager, Warranty Manager, Service Advisors, Technicians, Fleet Repair

SUBJECT:

WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

Warranty Information:
MODEL

Elantra
(CN7)

OP CODE

OPERATION

OP
TIME

10D056R0

WTS COOLANT LEAKAGE
INSPECTION ONLY

0.2

10D056R1

WTS MOUNTING HOLE
MACHINING AND WTS
REPLACEMENT

CAUSAL P/N

5M515-2JU00

NATURE CAUSE
CODE
CODE

E81

ZZ7

0.8

NOTE 1: Submit claim on Campaign Claim Entry Screen
NOTE 2: If a part is found in need of replacement while performing the repair for this TSB, and the
affected part is still under warranty, please submit a separate claim using the same Repair Order. If
the affected part is out of warranty, submit a prior approval request for goodwill consideration prior to
performing the work.
NOTE 3: Use of sandpaper and coolant in the amount of $5.00 will be reimbursed as sublet under
Labor Operation 10D056R1.
Inspection Procedure:
1.

Turn the engine off and open the hood to
prepare for coolant leakage inspection with a
flashlight.

!

CAUTION

Be sure to turn the engine off and
confirm that the cooling fan is off prior
to performing the leak inspection.



The area to be inspected for coolant leak is
the cylinder head and surrounding portions
near the mid-point between the intake
manifold and intake hose.

Inspection Area

TSB #: 21-01-048H

Page 2 of 11

SUBJECT: WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

(FOR VISUALIZATION PURPOSES ONLY)
Do not remove the intake manifold for inspection.

As shown above at areas surrounding sensor
#2, visually check for signs of coolant leak.
2.
B

A



NOTICE

Inspect for coolant leak residue near the
cylinder head gasket (A), and areas near
the lower end of the intake hose and the
intake manifold (B).

 If no signs of coolant leaks are found, then the inspection procedure is complete.
 If coolant leaks are found, then perform the service procedure in the following pages.

TSB #: 21-01-048H

Page 3 of 11

SUBJECT:

WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

Service Procedure:
1.

Cover the front of the vehicle (A) to protect it
from any scratches.

2.

Turn off the ignition switch and disconnect the
battery (-) terminal (B).
NOTE: Be sure to record the radio presents
prior to battery disconnection.
Tightening torque:
8.8 Nm (78 lb-in)

3.

Loosen and remove the two bolts (C) attaching
the wiring holder/protector.

TSB #: 21-01-048H

Page 4 of 11

SUBJECT: WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

4.

Remove the engine under cover (E) after lifting
the vehicle.

Engine
Under Cover

Tightening torque:
9.8 Nm (87 lb-in)

5.

Loosen the upper mounting bolt (F) of the
intake manifold bracket.
Tightening torque:
21 Nm (15.5 lb-ft)


6.

Only loosen the upper mounting bolt (F).
Do not remove the intake manifold bracket.

After lowering the vehicle to the floor,
disconnect the intake hose AFS with the fixing
wiring clip (G).

TSB #: 21-01-048H

Page 5 of 11

SUBJECT:

7.

WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

Loosen the intake hose fixing clamp (H) and
remove the hose.
Tightening torque:
3.9 Nm (34.5 lb-in)

8.

Loosen the intake manifold vacuum hose
clamp (I) and disconnect the PCSV hose quick
connector (J).

9.

Disconnect the injector connectors (K).

TSB #: 21-01-048H

Page 6 of 11

SUBJECT: WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

10.

Disconnect the engine wiring connector and
the harness clamp to allow separating the
wiring harness from the intake manifold.

11.

Loosen the intake manifold fixing nuts & bolts
and remove the intake manifold.

NOTICE
During the reinstallation steps,
temporarily fasten the intake manifold
in the order shown in the figure below
and then fully fasten them to the
specified torque.
Tightening torque:
21 Nm (15.5 lb-ft)

TSB #: 21-01-048H

Page 7 of 11

SUBJECT:

12.

WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

Place a clean drain pan underneath the
vehicle.

NOTICE
Additional coolant may be drained
when the WTS is removed.

13.

After removing the WTS connector, loosen the
mounting bolt (L), and remove the WTS from
the mounting hole.

NOTICE
Use shop air to remove any excess
coolant from previous leaks in addition
to the coolant that may have drained
after the WTS was removed. Use a
shop towel if necessary to wipe dry the
WTS mounting hole for the next steps.

TSB #: 21-01-048H

Page 8 of 11

SUBJECT: WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

14.

Position the prepared 4”X4” sized sandpaper
and wrap it tightly around a Philips screwdriver
tip as shown (M).

15.

Remove the burr while rotating in the circular
direction as shown by the arrow for about 8 ~ 9
times while maintaining a perpendicular angle
to the WTS mounting hole.

WTS O-ring sealing surface to be sanded

NOTICE
After the burr of the WTS O-ring sealing surface has been sanded away, use shop air to
blow away the removed burr chips and sanding debris from the WTS mounting hole and its
surrounding areas.
Use a lint free shop towel to wipe clean the WTS mounting hole and any remaining coolant
residue from the cylinder head and the cylinder block.

TSB #: 21-01-048H

Page 9 of 11

SUBJECT:

16.

WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

First, apply some coolant to wet the O-ring of
the new WTS and also to the newly reworked
mounting hole. (This is important to
lubricate and prevent any pinching damage
to the WTS O-ring seal during installation.)
Then, install the new WTS (N) while slightly
rotating it as the O-ring of the WTS is carefully
pushed into the mounting hole.

17.

To complete the WTS installation, check that
the O-ring is fully seated into the mounting
hole and then fasten the mounting bolt while
initially holding the WTS flat against the
cylinder head.
Tightening torque:
10.8 Nm (95.5 lb-in)

NOTICE
Be sure to connect the WTS to the
engine wiring harness during the
reassembly.

TSB #: 21-01-048H

Page 10 of 11

SUBJECT: WATER TEMPERATURE SENSOR LEAK INSPECTION AND REPAIR (SERVICE CAMPAIGN T6Q)

18.

Reinstall the remaining parts and engine wiring
harness connections in the reverse order of
removal/disconnection.
NOTE: Reprogram the radio presets recorded
from Service Procedure Step 2.

19.

Refill and air bleed the cooling system
according to the Shop Manual.

NOTICE

Refer to 2021 Shop Manual section: Engine
Mechanical System > Cooling System >
Coolant > Repair procedures > Refilling And
Bleeding

Low coolant level and/or improper air
bleeding of the cooling system may
results in poor engine cooling,
improper HVAC system performance,
and abnormal noise from the cooling
system.
20.

Verify final repair by checking for any coolant
leaks near the WTS. Wipe off any spilled
coolant from the vehicle that may have
occurred during the repair process.

TSB #: 21-01-048H

Page 11 of 11