GROUP

NUMBER

AUTOMATIC
TRANSMISSION
DATE

Technical Service Bulletin

17-HC-003-1
MODEL

OCTOBER, 2017

SONATA HYBRID
(YF HEV/LF HEV)

AUTOMATIC TRANSAXLE INHIBITOR SWITCH

SUBJECT:

This TSB supersedes TSB 17-HC-003 to add hybrid cautionary steps.
Description: If you are servicing a Sonata Hybrid with any of the warning messages or comments
listed below, follow the Service Procedure to diagnose the condition.
 Hybrid Warning Message was illuminated
 Dash displayed a message: “Check Hybrid System, Turn off engine”
 Diagnostic Trouble Code P0705 – Transmission range sensor circuit
Applicable Vehicles:
2011~15
2016~

Sonata Hybrid (YF HEV)
Sonata Hybrid (LF HEV)

PARTS INFORMATION:
MODEL

PART NAME

PNC CODE

PART NUMBER

Inhibitor switch

42700E

42700-3B***

2011~15 Sonata HEV (YF HEV)
2016~ Sonata Hybrid (LF HEV)
WARRANTY INFORMATION:
MODEL
2011~15 Sonata
Hybrid (YF HEV)

OP CODE

OPERATION

OP TIME

CAUSAL
PART

NATURE
CODE

CAUSE
CODE

42700R00

Replace
inhibitor switch

Refer to
WEBLTS for
current LTS
time

See Parts
Catalog

I3A

ZZ3

2016~ Sonata
Hybrid (LF HEV)
All

42700RQ0

GDS

SERVICE PROCEDURE:

1.

Turn the ignition key to the ON position or push the Start/Stop Button two times without
depressing the brake pedal.

2.

Attach a GDS and check for DTC in the “Automatic Transaxle” menu. Record the DTC and
description. Delete the DTC.

Circulate To: Service Manager, Warranty Manager, Service Advisors, Technicians, Fleet Repair

SUBJECT:

AUTOMATIC TRANSAXLE INHIBITOR SWITCH

3.

Move the shift lever through all gears (P, R, N and D) and monitor the Shift Lever Switch.
 Data Analysis, A/T menu and Shift Lever Switch.

4.

If the Shift Lever Switch shows:
 The correct shift lever position, the wiring currently has no open/short circuits. Go to
Step 6.
 Does not show the correct shift lever position, go to Step 5.

5.

Visually check the wiring harness between the PCM and inhibitor switch for a damaged wire or
open circuit/short circuit to ground. Check for a damaged pin or pin not fully inserted into the
connector.
 If damage is found, repair or replace the control wiring and drive the vehicle to confirm the
repair.
 If no damage or open/short circuit is found, go to Step 6.

6.

Turn the ignition switch to the ON position and
place the shift lever in P and N. Confirm the
indicator lights in the dash cluster show the
correct gear in P and N.
 If P and N are displayed, go to Step 7.
 If P or N are not displayed, go to Step 20
and check the alignment of the inhibitor
switch. If P and N are not displayed after
adjustment, go to Step 7.

.

TSB #: 17-HC-003-1

Page 2 of 9

SUBJECT:

7.

AUTOMATIC TRANSAXLE INHIBITOR SWITCH DTC

Check the TCU and TCU2 fuse in the junction
box in the engine compartment:
 Check the fuse for an open circuit.
 Check the fuse for correct capacity.
 Check the fuse holder for a tight fit.
 Check for loose or damaged wires.
If damage or intermittent open circuit is found,
repair or replace the junction box and front
harness.
If no damage or intermittent open circuit is
found, go to Step 8.

8.

Proper Gap Between
Fuse Terminals

Loose Fit Between
Fuse terminals

Check the rear combination lamp ground for
tightness.
Turn the ignition and headlights on. Use a
DVOM to check the voltage drop between the
combination lamp wiring terminal and ground.
Specification: Less than 0.2 V.
If more than 0.2V, clean the terminal and bolt
threads and tighten the bolt.
If less than 0.2V, go to Step 9.
Torque: 7~9 lb-ft (1.0~1.2kgf.m)

9.

Apply the parking brake. Move the shift lever to
the “N” position.
Turn the ignition switch to the OFF position.

TSB #: 17-HC-003-1

Page 3 of 9

SUBJECT:

AUTOMATIC TRANSAXLE INHIBITOR SWITCH

10. Remove the plastic tabs and remove the air
duct.

11. Put on insulation gloves.
Open the trunk. Remove the carpet and access the safety plug.
YF HEV: Open the access cover. Pull the latch
outward and remove the safety plug.

TSB #: 17-HC-003-1

LF HEV: Remove the access cover. Pull the
green tab outward and pull out the safety
plug.

Page 4 of 9

AUTOMATIC TRANSAXLE INHIBITOR SWITCH DTC

SUBJECT:

12.

!

CAUTION

Without depressing the brake pedal, push the Start-Stop button 2 times to power the
cluster.
Attach a GDS and select Data Analysis, BMS menu and Inverter Capacitor Voltage.
Confirm the Inverter Capacitor Voltage is less than 30V.
 If less than 30V, the system voltage is safe for the technician. Go to Step 13.
 If more than 30V, wait until the voltage is below 30V. Go to Step 13.

13. Record the preset radio stations and reset after
repairs are completed.
Open the trunk and disconnect the negative
battery cable.
Torque: 7~9 lb-ft (1.0~1

TSB #: 17-HC-003-1

Page 5 of 9

SUBJECT:

AUTOMATIC TRANSAXLE INHIBITOR SWITCH

14. Disconnect the breather hose and the air duct.
Disconnect the intake air temperature sensor.
Loosen the clamp on the air duct.
Disconnect two bolts that secure the air cleaner
and remove the air cleaner.
Torque: 7~9 lb-ft (1.0~1.2kgf.m, 10~12 N.m)

15. Loosen the cap on the reservoir.
Raise the vehicle on a hoist.
Remove the plastic undercover below the
engine and transmission.
Locate the hose under the Hybrid radiator on the
driver’s side of the vehicle.
Remove the clamp and pull the hose off to drain
the coolant from the reservoir.
NOTE: Save the coolant in a clean container.
Reinstall the hose and clamp.
Reinstall the undercover.
16. Remove two bolts to the HPCU protector and
remove the cover.
Remove the clamps to the coolant hoses and
remove the hoses.
Remove the ground cable.
Remove 2 bolts and 1 nut that secure the
reservoir and remove the reservoir.

TSB #: 17-HC-003-1

Page 6 of 9

SUBJECT:

AUTOMATIC TRANSAXLE INHIBITOR SWITCH DTC

17. Remove the power cables:
 Yellow arrow: Pull out yellow tab, press tab
 Red arrow: Press black tab on latch
 White arrow: Press black tab
Remove 3 bolts and remove the HPCU.
(If necessary, refer to Sonata Hybrid Shop
Manual, Hybrid Control System, Hybrid Control
System, HPCU, Repair procedure).

18. Disconnect the inhibitor switch connector (A)
Remove the shift cable mounting nut (B).
Remove the nut (C) and washer and remove the
manual control lever (D).

19. Remove 2 mounting bolts (E) and remove the
inhibitor switch assembly.
Install the new inhibitor switch assembly to the
transaxle and tighten the mounting bolts.
Torque: 7~9 lb-ft (1.0~1.2 kgf.m, 10~12 N.m)

TSB #: 17-HC-003-1

Page 7 of 9

SUBJECT:

AUTOMATIC TRANSAXLE INHIBITOR SWITCH

20. Install the manual control lever, washer and nut
to the new inhibitor switch and tighten the nut.
Torque: 13~18 lb-ft (1.8~2.5 kgf.m/18~24 N.m)
Insert the 09480-A3800 guide pin or 5mm bolt
in the alignment hole before tightening the nut.
SST 09480-A3800, Inhibitor Switch Guide Pin.

21. Confirm the shift lever is in the N position.
Install the shift cable nut and tighten the nut (B)
to specification.
Torque: 6~9 lb-ft (0.8 ~ 1.2 kgf.m, 8~12 N.m)

B

Remove the SST or 5mm bolt from the
alignment hole.

22. Install 3 bolts that secure the HPCU.
Torque: 14~22 lb-ft (2~3 kgf.m, 20~29 N.m)
Reconnect the power cables and ground wire.

TSB #: 17-HC-003-1

Page 8 of 9

SUBJECT:

AUTOMATIC TRANSAXLE INHIBITOR SWITCH DTC

23. Install 2 bolts and 1 nut that secure the coolant
reservoir.
Torque: 3~4 lb-ft (0.4~0.6 kgf.m, 4~6 N.m)
Reinstall the coolant reservoir and hoses.
Refill the coolant and perform air bleeding using
GDS. Select S/W Management, HEV Motor
Control System and Electric Water Pump
Control.

24. Reinstall all the removed parts in reverse order of removal.
Reset the preset radio stations.
Clear any DTC in all modules.
Clear any DTC in the BlueLink system per instructions of TSB 12-BE-005-2.
25. Move the shift lever through P, R, N and D and confirm the indicator lights on the shift lever and
cluster illuminate.
Drive the vehicle to confirm the hybrid system performs correctly.

TSB #: 17-HC-003-1

Page 9 of 9