T-SB-0016-19

January 25, 2019

CVT Hiss Noise Valve Body Replacement
Service
Category

Drivetrain

Section

CVT

Market USA

Applicability
YEAR(S)

MODEL(S)

ADDITIONAL INFORMATION

2014 - 2018

Corolla

Transmission(s): CVT

2017 - 2018

iM

Introduction

Some 2014 – 2018 model year Corolla and 2017 – 2018 model year iM vehicles equipped with
the K313 Continuously Variable Transaxle (CVT) may exhibit a high-pitched hiss or whine noise
after the vehicle has reached normal operating temperature. This condition may be caused by the
valve body plate inside the CVT assembly. Follow the Repair Procedure in this bulletin to address
this condition.
Production Change Information
NOTE
 Reference the CVT serial number information below to identify if the CVT was produced BEFORE
the implemented production change.
 Reference the vehicle VIN information included below to identify if the vehicle was produced
BEFORE the implemented production change.

1. Locate the CVT serial number.
The CVT serial number is stamped on the
case as shown.

Figure 1. K313 CVT Serial Number Location

1
c

1

© 2019 Toyota Motor Sales, USA

CVT Serial Location

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CVT Hiss Noise Valve Body Replacement
Production Change Information (continued)

2. Reference the serial decoder below for the CVT.
Figure 2. TMH Produced K313 Serial Decoder

Figure 3. Aisin AW Produced K313 Serial Decoder

5-digit Serial Number

5-digit Serial Number

Line Code

Transmission Model (BQ-K313)

Month of Manufacture
Month of Manufacture
A: Jan, B: Feb, C: Mar, D: Apr, E: May, F: Jun,

Year of Manufacture

G: Jul, H: Aug, J: Sep, K: Oct
Transmission Model Code

Year of Manufacture

This bulletin applies to vehicles produced BEFORE the Production Change Effective Serial
Numbers shown below.
CVT MANUFACTURER

PRODUCTION
LINE

PRODUCTION CHANGE EFFECTIVE SERIAL NUMBER

Aisin AW

–

18GBQ4906

1

2B18G108808

2

2B18G206410

3

2B18G307308

Toyota Motor Hokkaido (TMH)

NOTE
As an additional supplementary reference, the vehicle VIN information is included below.

This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs
shown below.
MODEL

PLANT

DRIVETRAIN

TMMBC
Corolla

PRODUCTION CHANGE EFFECTIVE VIN

2T1BPRHE#KC167424
K313

TMMMS

5YFBURHE#KP891129

NOTE
ALL iM model vehicles were produced before the applicable countermeasure was implemented.

© 2019 Toyota Motor Sales, USA

T-SB-0016-19

January 25, 2019

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CVT Hiss Noise Valve Body Replacement
Warranty Information
OP CODE

DESCRIPTION

TIME

OFP

T1

T2

TC1804

R & R CVT Valve Body Assembly

3.1

35410-12871

91

99

APPLICABLE WARRANTY
 This repair is covered under the Toyota Powertrain Warranty. This warranty is in effect for
60 months or 60,000 miles, whichever occurs first, from the vehicle’s in-service date.
 Warranty application is limited to occurrence of the specified condition described in
this bulletin.

Parts Information
PART NUMBER

PART NAME

QTY

35410-12871

Body Assy, Transmission Valve

1

35168-12091

Gasket, Transaxle Oil Pan

1

35145-07010

Gasket, Transaxle Case

1

90301-22019

1
Ring, O

90301-06004

1

08886-02505

ATF CVT FE (4-Liter Can)

2*

*This Repair Procedure requires approximately 6 L of CVT fluid.

Repair Procedure
Diagnosis

1. Turn the vehicle ON.
2. In Park or Neutral with the engine running, allow the vehicle to sit for 15 – 20 minutes to
reach normal operating temperature.
A. Lower the driver’s side window.
B. Test-drive the vehicle.
C. Listen for a hissing noise. Refer to the video link below for an example of this condition.
Example of Hissing Noise
Is a hissing noise similar to the example present?
 YES — Continue to the Repair Procedure to replace the CVT valve body assembly.


NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.

© 2019 Toyota Motor Sales, USA

T-SB-0016-19

January 25, 2019

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CVT Hiss Noise Valve Body Replacement
Repair Procedure (continued)
Valve Body Removal
Figure 4. Valve Body Location

NOTICE
 TO PREVENT CONTAMINATION, DO NOT CLEAN THE CVT CASE.
 Perform work when it can be done without interruption to prevent foreign materials or dust
from entering the transmission.
 Prepare a clean work environment BEFORE initiating work.
 Do NOT contaminate the CVT with debris and dust.
 Do NOT use a shop cloth, a paper shop cloth, or cotton gloves.
 Do NOT perform work in close proximity to others using compressed air guns.

NOTE
Do NOT open the package of the NEW transmission valve body assembly until
IMMEDIATELY BEFORE replacement.

© 2019 Toyota Motor Sales, USA

T-SB-0016-19

January 25, 2019

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CVT Hiss Noise Valve Body Replacement
Repair Procedure (continued)
Valve Body Removal (continued)

1. Remove the CVT fluid.
Refer to the TIS, applicable model and model year Repair Manual:


2014 / 2015 / 2016 / 2017 / 2018 Corolla:
Drivetrain – CVT – “K313 CVT: Continuously Variable Transaxle Fluid: Replacement”



2017 / 2018 iM:
Drivetrain – CVT – “K313 CVT: Continuously Variable Transaxle Fluid: Replacement”

2. Remove the drain plug and gasket from the CVT oil pan sub-assembly.

3. Remove ALL 16 bolts, the CVT oil pan
sub-assembly, and the CVT oil pan gasket
from the CVT assembly.

Figure 5. CVT Oil Pan Bolts

NOTE
Remove the CVT oil pan sub-assembly with
care as some fluid will remain in the CVT oil
pan sub-assembly.

© 2019 Toyota Motor Sales, USA

T-SB-0016-19

January 25, 2019

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CVT Hiss Noise Valve Body Replacement
Repair Procedure (continued)
Valve Body Removal (continued)

4. Remove the CVT oil pan gasket from the CVT oil pan sub-assembly.
Wash away ANY metal contaminants and sludge deposited inside the CVT oil pan
sub-assembly by using NEW CVT fluid.
NOTICE
 Lightly clean as needed to prevent contamination.
 Do NOT use brake cleaner.
 It is NOT required to remove the metal contaminants attached to the magnet.

5. Unscrew the three bolts and remove the
oil strainer from the transmission valve
body assembly.

Figure 6. Oil Strainer

1

Bolt A Length: 16 mm (2)
Bolt B Length: 25 mm (1)
NOTE

B

Additional CVT fluid will flow out during oil
strainer removal.

A

A
A

2

1

Front of Vehicle

2

16 m m Bolt

3

25 m m Bolt

© 2019 Toyota Motor Sales, USA

B

3

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CVT Hiss Noise Valve Body Replacement
Repair Procedure (continued)
Valve Body Removal (continued)

6. Remove the O-ring from the oil strainer.

Figure 7. Oil Strainer O-ring Removal

NOTE
Make sure there is no contamination on the
oil strainer.

7. Remove the transmission harness.
A. Disconnect the five valve body
connectors of the transmission
harness from the transmission
valve body assembly.

Figure 8. Valve Body Connectors

1

NOTE
Do NOT remove the respective solenoid
valves from the transmission valve body.

1

© 2019 Toyota Motor Sales, USA

Front of Vehicle

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CVT Hiss Noise Valve Body Replacement
Repair Procedure (continued)
Valve Body Removal (continued)

(1) Apply the needle-nose plier end to
the male connector tab.
(2) Gently hold the needle-nose plier
and push the male connector
tab out.

Figure 9. Valve Body Connectors
1

3
5