GROUP

NUMBER

Body
DATE

Technical Service Bulletin
SUBJECT:

May, 2020

20-BD-015H
MODEL(S)
Sonata (LFa)

TRUNK LID TORSION BAR SERVICE GUIDE
AND WARRANTY EXTENSION (TXXF)

This TSB supersedes 19-BD-009H-1 by updating the service procedure and parts information.
Description: On certain Sonata (LF) vehicles equipped with smart trunk, the trunk lid may not open to
the desired height when using the smart trunk feature. Follow the procedure in the bulletin to inspect
the trunk lid opening height, and replace the torsion bars if required.
The warranty coverage for the trunk lid torsion bars has been extended to 78 months or 78,000 miles
from the date of original retail delivery or date of first use, whichever occurs first, and is valid for original
and subsequent owners.

Applicable Vehicles: 2015 ~ 2017 model year Sonata (LFa) equipped with Smart Trunk Feature
Parts Information:
PART NAME

PART NUMBER COLOR LABEL

BAR-TRUNK LID HINGE
TORSION LH (Non-LED)

79273-C1010

White

BAR-TRUNK LID HINGE
TORSION RH (Non-LED)

79283-C1010

Yellow

BAR-TRUNK LID HINGE
TORSION LH (LED)

79273-C2000

Green

BAR-TRUNK LID HINGE
TORSION RH (LED)

79283-C2000

Pink

Lithium or silicone grease

N/A

N/A

COMMENT

IMAGE

For vehicles with
non-LED tail
lamps

For vehicles with
LED tail lamps
General multipurpose grease

NOTE: Lithium/silicone grease can be purchased from local parts suppliers.
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair

SUBJECT:

TORSION BAR SERVICE GUIDE AND WARRANTY EXTENSION (TXXF)

Warranty Information:
MODEL OP CODE
Sonata
(LFa)

79273R00

OPERATION
BAR-TRUNK LID
HINGE TORSION

OP TIME

0.3 M/H

CAUSAL PART
79273-C1010
79283-C1010
79273-C2000
79283-C2000

NATURE
CODE

CAUSE
CODE

I14

ZZ3

Inspection Procedure:
1. Using the key fob, perform an open and close
cycle of the trunk lid ten times.

2. Open the trunk lid, and measure the trunk
opening height using a ruler or measuring tape.
The measurement should be taken from the
center of the bumper to the bottom of the trunk
lid.

NOTICE
To assist in taking an accurate measurement,
place a thin piece of cardboard on the bumper
to accurately measure the opening height,
vertically along the trunk lid opening axis.

3. If the trunk lid opens more than 7.5 inches
(190.5 mm), no further action is required. The
trunk is functioning properly and the inspection
procedure is complete. Submit a warranty claim
for applicable labor.
If the trunk lid does not open more than 7.5
inches (190.5 mm), proceed to step 4 to replace
the torsion bars.

TSB #: 20-BD-015H

Page 2 of 6
SUBJECT:

SUBJECT:

TORSION BAR SERVICE GUIDE AND WARRANTY EXTENSION (TXXF)

4. Before removing the torsion bars from the
vehicle, inspect the labels on the replacement
torsion bars to verify their production date.
Verify that the replacement torsion bars were
produced after February 2019.
Do not use replacement torsion bars produced
before February 2019.
1.
2.
3.
4.

Production year
Production month
Production sequence
Left / right side

!

WARNING

While holding the vice grips, there will be an increase in tension after
disconnecting the hinge from the torsion bar. Use caution to prevent injury.

5. After opening the trunk, use a vice grip to push
down on the outer side of the torsion bar away
from the hinge (A).
Ensure the vice grip holds on to the outer edge
of the torsion bar, outer side of the hinge (B).

TSB #: 20-BD-015H

A
B

Page 3 of 6
SUBJECT:

SUBJECT:

TORSION BAR SERVICE GUIDE AND WARRANTY EXTENSION (TXXF)

6. Pull the vice grips downward to release the
hinge (A) from the torsion bar, and push the
hinge toward the outside of the trunk.

A

7. After releasing the hinge (A) from the torsion
bar, slowly lift the torsion bar held by the vice
grip and release the vice grip.

8. Disconnect the released torsion bar from the
center clip (C).

TSB #: 20-BD-015H

A

C

Page 4 of 6
SUBJECT:

SUBJECT:

TORSION BAR SERVICE GUIDE AND WARRANTY EXTENSION (TXXF)

9. Remove the loose torsion bar from the mounting
point on the opposite side, and then remove
from the vehicle.

!

WARNING

After removing the first torsion bar, place a
prop rod that is approximately 5 feet long to
hold the trunk lid open while performing the
procedure.

10. Perform the same removal process to the other
torsion bar.
11. Apply grease to the indicated locations on the
replacement torsion bars before installing them
into the vehicle.

LH Side

RH Side

TSB #: 20-BD-015H

Page 5 of 6
SUBJECT:

SUBJECT:

TORSION BAR SERVICE GUIDE AND WARRANTY EXTENSION (TXXF)

12. Install the new torsion bars in reverse order of
the removal.
Vehicles with LED tail lamps

Vehicles with non-LED tail lamps

Green labeled torsion bar on top
(P/N: 79273-C2000)
Pink labeled torsion bar on bottom
(P/N: 79283-C2000)

White labeled torsion bar on top
(P/N: 79273-C1010)
Yellow labeled torsion bar on bottom
(P/N: 79283-C1010)

13. Check for proper operation of the trunk by
performing an open and close cycle five times
using the key fob. Perform the same
measurements in step 2 and 3 to confirm that
the proper specification is met.
14. The service procedure is now complete.

TSB #: 20-BD-015H

Page 6 of 6
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