ITB12-072G

Classification:
Reference:
Date:
RA12-003G
ITB12-072G
March 15, 2022
INFINITI AWD MODELS; ABNORMAL NOISE, VIBRATION
AND/OR JUDDER FROM REAR DIFFERENTIAL
This bulletin has been amended. See AMENDMENT HISTORY on the last page.
Please discard previous versions of this bulletin.
APPLIED VEHICLES: 2013 JX35 (L50)
2014-2020 QX60 (L50)
2014-2019 QX60 Hybrid (L50H)
2022 QX60 (L51)
2019-2022 QX50 (J55)
2022 QX55 (FJ55)
AWD only
IF YOU CONFIRM
There is an abnormal noise, vibration and/or judder from the rear differential area of the vehicle.
ACTION
Follow the Flow Chart on page 2 to assist in diagnosis.
IMPORTANT: Tire size, brand or tread pattern mismatches can cause similar symptoms. To avoid tire related
mismatch vibration, it is recommended that when tires need to be replaced, all tires are replaced at the same
time with tires of the proper size, same brand and pattern.
IMPORTANT: The purpose of ACTION (above) is to give you a quick idea of the work you will be performing.
You MUST closely follow the ESM as it contains information that is essential to successfully completing this
repair.
Infiniti Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained
individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe
that a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Infiniti retailer to determine if this
applies to your vehicle.
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Flow Chart
YES
Is there an abnormal noise, vibration and/or judder
from the rear Final Drive Assembly?
Disconnect the Electric Controlled Coupling and retest. Is
the noise, vibration and/or judder still present?
This bulletin
does not
apply.
NO
YES
Is the vehicle a 2022
QX60?
Use a stethoscope and test for
noise at the Electric Controlled
Coupling, and at the center
rear of the Final Drive
Assembly. Is the noise louder
at the Coupler Clutch area or
at the center rear of the Final
Drive Assembly?
Final Drive
Assembly
The 2022 QX60 have a new AWD
coupler system with hydraulic
clutch pressure and oil pump. It is
normal operation to hear the pump
prime when ignition is turned on.
Was the abnormal noise
only heard at startup with
the vehicle not moving?
Is the noise
louder than a
KGV only at
the Electric
Controlled
Coupling?
NO
NO
YES
Run the priming
operation on the
Coupler Actuator.
Is noise louder
than a KGV?
NO
YES
NO
YES
Electric Controlled
Coupling
Is the noise louder
than a KGV only at
the center rear of
the Final Drive
Assembly?
NO
NO
YES
Was the
abnormal noise
heard while
driving?
YES
YES
NO
This bulletin
does not apply
Replace the Final
Drive Assembly
Replace the Electric
Controlled Coupling
Replace the Electric
Controlled Coupling
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ITB12-072G
ELECTRIC CONTROLLED COUPLING REPLACEMENT
If diagnosis leads to replacement of the Electric Controlled Coupling for the rear final drive:

DO NOT replace the entire Rear Final Drive Assembly.

DO NOT remove the Rear Final Drive Assembly for this procedure. The Electric Controlled Coupling
can be replaced with the Rear Final Drive Assembly in the vehicle.

Refer to the Electronic Service Manual (ESM) for removal and installation information.
o For 2019-2022 QX50 and 2022 QX55: TRANSMISSION & DRIVELINE > DRIVELINE > REAR
FINAL DRIVE: R145 > REMOVAL AND INSTALLATION > ELECTRIC CONTROLLED
COUPLING
o For 2022 QX60: TRANSMISSION & DRIVELINE > DRIVELINE > REAR FINAL DRIVE: R145 >
REMOVAL AND INSTALLATION > ELECTRO-HYDRAULIC COUPLING
o
For 2013 JX, and 2014-2020 QX60 and QX60 Hybrid: TRANSMISSION & DRIVELINE >
DRIVELINE > REAR FINAL DRIVE: R145K1 > REMOVAL AND INSTALLATION > ELECTRIC
CONTROLLED COUPLING
REAR FINAL DRIVE ASSEMBLY REPLACEMENT
If diagnosis leads to replacement of the Rear Final Drive Assembly:

Refer to the Electronic Service Manual (ESM) for removal and installation information.
o For 2022 QX60, 2019-2022 QX50, and 2022 QX55: TRANSMISSION & DRIVELINE > DRIVELINE
> REAR FINAL DRIVE: R145 > UNIT REMOVAL AND INSTALLATION > REAR FINAL DRIVE
ASSEMBLY
o
For 2013 JX, and 2014-2020 QX60 and QX60 Hybrid: TRANSMISSION & DRIVELINE >
DRIVELINE > REAR FINAL DRIVE: R145K1 > UNIT REMOVAL AND INSTALLATION > REAR
FINAL DRIVE ASSEMBLY
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ITB12-072G
UNIT CHARACTERISTICS WRITING
Performing “Unit Characteristics Writing” of the electric controlled coupling with CONSULT-III plus is required
on some models when replacing the Electric Controlled Coupling or the Final Drive Assembly.

Refer to the Electronic Service Manual (ESM) for Unit Characteristics Writing.
o For 2013 JX and 2014-2020 QX60 and QX60 Hybrid: TRANSMISSION & DRIVELINE >
DRIVELINE > TRANSFER: TY21C > BASIC INSPECTION > UNIT CHARACTERISTICS
WRITING
o For 2022 QX60: TRANSMISSION & DRIVELINE > DRIVELINE > TRANSFER: TY92B > BASIC
INSPECTION > ADDITIONAL SERVICE WHEN REPLACING AWD CONTROL UNIT (IN
ELECTRIC-CONTROLLED COUPLING)
o For 2019-2022 QX50 and 2022 QX55: TRANSMISSION & DRIVELINE > DRIVELINE >
TRANSFER: TY21D > BASIC INSPECTION > UNIT CHARACTERISTICS WRITING
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ITB12-072G
PARTS INFORMATION
For Models:
2013 JX35 (L50)
2014-2020 QX60 (L50)
2014-2019 QX60 Hybrid (L50H)
2019-2022 QX50 (J55)
2022 QX55 (FJ55)
DESCRIPTION
PART NUMBER
BOLT (PROPELLER SHAFT)
37120-(*****) (1)
BREATHER
38322-(*****) (1)
CONNECTOR, BREATHER
17235-(*****) (1)
CPLG ASSY-ELEC
(Electric Controlled Coupling)
38761-(*****) (1)
FINAL DRIVE ASSEMBLY
38300-(*****) (1)
NUT PROPELLER SHAFT
37171-(*****) (1)
NUT (TORSIONAL DAMPER)
37171-(*****) (1)
3 BOND GSKT MKR-RTV (2) (3)
999MP-1217FPP
QUANTITY
4
As Needed
1
As Needed
1
As Needed
1
As Needed
1
As Needed
4
As Needed
4
As Needed
As Needed
(1) Use the VIN and the Electronic Parts Catalog to look up the part number for the vehicle you are working on.
(2) This product is considered a shop supply; do not include it on your warranty claim.
(3) Order this item through the Infiniti Maintenance Advantage program: Phone 877-INF-IMA1 (877-463-4621).
Website order via link on the dealer portal: www.NNAnet.com and click on the “Maintenance AdvantageTire/Battery/Chemical” link.
PARTS INFORMATION continued on next page
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ITB12-072G
For Models:
2022 QX60 (L51)
DESCRIPTION
PART NUMBER
BOLT (PROPELLER SHAFT)
37120-(*****) (1)
CPLG ASSY-ELEC
(Electric Controlled Coupling)
38760-(*****) (1)
FINAL DRIVE ASSEMBLY
38300-(*****) (1)
3 BOND GSKT MKR-RTV (2) (3)
999MP-1217FPP
QUANTITY
4
As Needed
1
As Needed
1
As Needed
As Needed
(1) Use the VIN and the Electronic Parts Catalog to look up the part number for the vehicle you are working on.
(2) This product is considered a shop supply; do not include it on your warranty claim.
(3) Order this item through the Infiniti Maintenance Advantage program: Phone 877-INF-IMA1 (877-463-4621).
Website order via link on the dealer portal: www.NNAnet.com and click on the “Maintenance AdvantageTire/Battery/Chemical” link.
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ITB12-072G
CLAIMS INFORMATION
Submit a Primary Part (PP) type line claim using the following claims coding:
DESCRIPTION
PFP
OP CODE
SYM
Rpl Electronic Controlled Coupling
(1)
LB65AA
DIA
FRT
21
(2)
ZL
(1) Reference the Electronic Parts Catalog and use the Electronic Coupler (38761-*****) as the Primary Failed
Part (PFP).
(2) Reference the current Infiniti Warranty Flat Rate Manual and use the indicated Flat Rate Time (FRT).
OR
Submit a Primary Part (PP) type line claim using the following claims coding:
DESCRIPTION
PFP
OP CODE
SYM
R & I Final Drive Assembly
DIA
FRT
21
(2)
LB01AA
ZL
(1)
Replace Final Drive
LB021A
(1) Reference the Electronic Parts Catalog and use the Electronic Coupler (38761-*****) as the Primary Failed
Part (PFP).
(2) Reference the current Infiniti Warranty Flat Rate Manual and use the indicated Flat Rate Time (FRT).
AMENDMENT HISTORY
PUBLISHED DATE
REFERENCE
DESCRIPTION
October 29, 2012
ITB12-072
Original bulletin published.
November 1, 2012
ITB12-072a
PARTS INFORMATION section revised.
December 3, 2012
ITB12-072b
CLAIMS INFORMATION section revised.
September 24, 2015
ITB12-072c
APPLIED VEHICLES section revised, and SERVICE
PROCEDURE section removed.
September 28, 2018
ITB12-072d
APPLIED VEHICLES section revised.
November 12, 2018
ITB12-072e
PARTS INFORMATION section revised.
September 23, 2020
ITB12-072f
Title, APPLIED VEHICLES and PARTS INFORMATION
sections revised.
March 15, 2022
ITB12-072G
Changes throughout.
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ITB12-072G