ATTENTION:
GENERAL MANAGER

q

PARTS MANAGER

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CLAIMS PERSONNEL

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IMPORTANT - All
Service Personnel
Should Read and
Initial in the boxes
provided, right.

SERVICE MANAGER

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© 2025 Subaru of America, Inc. All rights reserved.

PRODUCT
CAMPAIGN
BULLETIN
SERVICE
BULLETIN
APPLICABILITY:

2023-2025 MY Solterra

NUMBER:

WRD-25R

DATE:
SUBJECT:

Safety Recall and Stop Sale: Solterra HVAC
ECU Reprogramming

09/12/25

REVISED:
NHTSA ID:

02/06/26
25V577

Subaru of America, Inc. (Subaru) has initiated a safety recall for certain 2023-2025 model year
Solterra Vehicles to update the HVAC control ECU software.
DESCRIPTION OF THE DEFECT AND SAFETY RISK
The subject vehicles are equipped with Heating, Ventilation, and Air Conditioning (HVAC) systems
that, among other things, control the windshield defroster function. Due to the programming of the
HVAC control ECU software, under certain conditions, such as a specific failure mode of the electric
compressor, the HVAC system will enter a failsafe mode that suspends the heater operation of the
system and affects defroster function.
In some cases, when the vehicle is operated in certain low temperatures, the defrosting performance
reduces and may not remove frost, ice and/or fog from the windshield glass. This can reduce driver
visibility and increase the risk of a crash in certain driving conditions.
REMEDY
Subaru retailers will update the HVAC control ECU software at no cost to the customer. For customer
satisfaction, dealers will inspect and, if necessary, replace the electrical compressor free of charge.
Due to current part inventory, stop sale vehicles requiring electrical compressor replacement will be
withheld from completion until part supply becomes sufficient and the service procedure provided in
this bulletin is revised.
AFFECTED VEHICLES
A total of 32,320 U.S. vehicles will be included in this safety recall as listed below. Not all vehicles
in the production range listed are affected by this recall. Coverage must be confirmed by using the
Vehicle Coverage Inquiry function on subarunet.com prior to repair.
Model Year

Carline

Production Date Range

2023-2025

Solterra

March 29, 2022 – June 3, 2025

CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD
RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS.
Subaru Service Bulletins are intended for use by professional technicians ONLY. They
are written to inform those technicians of conditions that may occur in some vehicles,
or to provide information that could assist in the proper servicing of the vehicle. Properly
trained technicians have the equipment, tools, safety instructions, and know-how to
do the job correctly and safely. If a condition is described, DO NOT assume that this
Service Bulletin applies to your vehicle, or that your vehicle will have that condition.

Subaru of America, Inc. is
ISO 14001 Compliant
ISO 14001 is the international standard for
excellence in Environmental Management
Systems. Please recycle or dispose of
automotive products in a manner that is friendly
to our environment and in accordance with all
local, state and federal laws and regulations.

Continued...
Bulletin Number: WRD-25R; Revised: 10/17/25

Page 1 of 41

RETAILER RESPONSIBILITY
Please be advised that it is a violation of Federal law for a dealer to deliver a new motor vehicle
covered by a recall under a sale or lease until the defect is remedied. Therefore, any Authorized
Subaru Retailer failing to perform the applicable service procedures to correct all affected vehicles
in their inventory prior to the vehicle being placed in service may be subject to civil penalties of up
to $27,874 per violation (i.e., for each vehicle), as provided in 49 CFR §578.6 and will also be in
breach of the Subaru Dealer Agreement.
Any vehicles listed in any recall/campaign that are in retailer stock must be:
•

Immediately identified

•

Tagged or otherwise marked to prevent their delivery or use prior to repair

•

Repaired in accordance with the repair procedures outlined in the Product Campaign Bulletin

Retailers are to promptly perform the applicable service procedures, to correct all affected vehicles in
their inventory (used, demo & SSLP). Whenever a vehicle subject to this recall is taken into retailer
inventory necessary steps should be taken to ensure the recall correction has been made before selling
or releasing the vehicle.
OWNER NOTIFICATION
Subaru will notify affected vehicle owners by first class mail within 60 days. Retailers will be advised
when owner notification is scheduled.
PART INFORMATION:
A part kit for vehicles requiring electrical compressor replacement is currently in development.
Information regarding order placement will be provided once made available.
Note: If a compressor kit is needed, follow the parts release process outlined below the service
procedure.
Part Description

Part Number

Qty

WRD-25 COMPRESSOR KIT

0400530242

1

Image

COMPRESSOR ASSY, W/M

1

RECEIVER ASSY

1

O-RING

2

O-RING Dimensions
ID : 13.4mm / OD : 18.2mm

O-RING

2

O-RING Dimensions
ID : 17.2mm / OD : 22.0mm

O-RING

3

O-RING Dimensions
ID : 10.8mm / OD : 15.6mm

O-RING

2

O-RING Dimensions
ID : 6.7mm / OD : 10.3mm

Continued...
Bulletin Number: WRD-25R; Revised: 10/17/25

Page 2 of 41

.CUW FILE INFORMATION:
The following files can be located in the ECU Data folder within the TechStream files located on the
Subaru Desktop.

MY

File Description

Target CID

New CID

23

NA(23MY)_8865F4216000.cuw

8865F4213100

8865F4216000

24-25

NA(24-25MY)_8865F4228100.cuw

8865F42220A0
or
8865F4228000

8865F4228100

REQUIRED TOOLS FOR REPROGRAMMING:
Tool Description

Applications

Image

Laptop
DST-i or DST-010
For DTC inspection
and
Reprogramming
GTS+

< MIDTRONICS >
DCA-8000

Required to maintain battery
voltage during the reprogramming procedure

Continued...
Bulletin Number: WRD-25R; Revised: 10/17/25

Page 3 of 41

REQUIRED TOOLS FOR A/C COMPRESSOR REPLACEMENT (IF REQUIRED):
Tool Description

Applications

Refrigerant Recovery and Filling Device
(compatible with 1234yf)

For air conditioner gas recovery
and refilling

Air conditioner gas leak tester

Inspect for refrigerant leak

Insulated Tool Set
and
Insulated Gloves

For working with high-voltage components

Circuit Tester

For checking voltage

Insulating tape

For connector protection

Protective Tape

For protecting parts

Torque Socket Wrench E8

For removing / installing compressor

Cable Tie

Image

For holding parts
(20-30cm)

Cloths

For cleaning

Protective Equipment

For protecting hands and eyes

General Tools

For work purposes

Torque Wrench

Check tightening torque

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Bulletin Number: WRD-25R; Revised: 10/17/25

Page 4 of 41

SERVICE PROCEDURE FLOW CHART:

NOTE: PRIOR to attempting any reprogramming, complete all required inspection and where
necessary related repairs outlined in the above flow chart. 2023MY vehicles MUST require the
software outlined in EEA-23 to be installed prior to reprogramming. ALWAYS confirm the target
CID prior to reprogramming.

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Bulletin Number: WRD-25R; Revised: 10/17/25

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COMPONENT LOCATION:

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Bulletin Number: WRD-25R; Revised: 10/17/25

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SERVICE PROCEDURE:
STEP 1: Has the vehicle been produced on or prior to January 14, 2025? This can be confirmed by
the vehicle inquiry.
YES: Proceed to Step 2.
NO: Proceed to Reprogramming File Procedure.
STEP 2: Is the AC compressor making abnormal noise.
YES: Refer to the service procedure in the APPENDIX A section.
NO: Proceed to Step 3.
STEP 3: Perform a Health Check using GTS+. Check for any faults detected by the Air Conditioner
system. Refer to the table below to confirm the next course of action.

JUDGMENT CRITERIA
Are any or both of the following DTCs current or stored?
DTC : B14721C ( A/C Inverter High Voltage Output Circuit Voltage Out of Range)
DTC : B14744B ( A/C Inverter Cooling/Heating Over Temperature)

NO
NO
YES

Inspection Result
No DTC detected

Next Step
Proceed to the next step.

Correct the fault using the procedure supplied in the
applicable SM and then proceed to the Reprograming
DTCs other than B14721C &
File Procedure. IMPORTANT: If the diag procedures
B14744B
lead to compressor replacement, refer to the procedure in the APPENDIX A section.
Order parts according to the parts ordering process,
B14721C and/or B14744B
and perform both the Compressor Motor and Redetected
ceiver Tank Replacement Procedure and the Reprogramming File Procedure.

STEP 4: Re-check for any other A/C compressor-related DTCs and inspect the A/C compressor for
abnormal noises. If any further assistance is require, please prepair the following information and
contact Techline.
• Record a video of the noise
•

Save a complete GTS+ Health Check

•

Save the Trouble Tree results for the related DTCs

Continued...
Bulletin Number: WRD-25R; Revised: 10/17/25

Page 10 of 41

STEP 5: Confirm the ignition switch is
“READY ON”. Check the status of the ambient temperature displayed on the instrument cluster. This
temperature will confirm the A/C settings for the required inspection mode performed in the next
step.

IMPORTANT: Inspection cannot be performed on vehicles stored in an outside temperature of
14°F (-10°C). The inspection mode of the compressor is strongly impacted by temperature. For cases
when the vehicle was stored below 14°F (-10°C), the vehicle MUST be warmed using the following
procedures:
1. Move the vehicle to a location with an ambient temperature higher than 14°F (-10°C).
2. Turn the ignition OFF and wait at least 3 minutes.
3. Disconnect the negative battery terminal.
4. Wait at least 2 minutes.
5. Reconnect the negative battery terminal.
6. Confirm the displayed ambient temperature on the instrument cluster reads above 14°F
(-10°C). Repeat this process until the desired temperature is reached prior to proceeding.

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STEP 6: Using the result from the previous step, confirm and apply the A/C settings required for the
inspection mode.

NOTE: If you change the Airflow mode control to FOOT after operating the AUTO switch, the
AUTO switch operation indicator light will turn off, but you will need to operate the AUTO switch to
operate the Fan Speed with automatic setting.
CAUTION:
•

Confirm the correct A/C settings are applied to confirm an accurate inspection.

•

Even if the A/C indicator is off, the A/C may still be operating. If you need to turn it off, first
turn the A/C on and then turn it off.

•

Even if the displayed temperature is below 77℉ (25℃), if the vehicle protection control
indicates a situation where the actual rotation remains at 0 rpm and below 1000 rpm for 30
seconds after the active test shows 5200 rpm, perform the A/C under conditions of 77℉
(25℃) or higher.

•

DO NOT perform any reprogramming prior to performing the inspection mode. The new
software will cause inaccurate results.
Continued...

Bulletin Number: WRD-25R; Revised: 10/17/25

Page 12 of 41

STEP 7: Using the GTS+, click on “Air Conditioner”
located in the “System Select” column.

STEP 8: Click on “Active Test” and “Compressor Target
Speed”. Click the “Next” button to continue.

STEP 9: Using the adjustment buttons, set the
compressor target speed to 5200.

STEP 10: Select the item from “Diagnosis” to “All Data”.

STEP 11: Select “Refrigerant Outlet Temperature Sensor” & “Compressor Actual Speed” then click
the “Graph” button to continue.

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STEP 12: Click the “Snapshot” button then click the “Snapshot Configuration” button. Set the
duration to ten minutes. Click the “OK” button to continue.

1.
2.
3.
4.

Snapshot Button
Snapshot Configuration Button
Duration Adjustment
OK Button

STEP 13: Click the “Record” button. Allow
the ten minute recording to begin. Allow the ten
minute time period for recording.
CAUTION: If the outside temperature displayed on
the meter is below 77°F (25°C) and the inspection
mode is set to “Air Conditioner OFF,” check the
“Actual Electric Compressor RPM” again before
recording. If it is still within the 0-1000 rpm range
after 30 seconds, switch the
inspection mode to “Air Conditioner ON,” just as if
the temperature were 77°F (25°C).
NOTE: If the graph does not appear, click the graph setting icon and change the Y-axis to “AUTO”.

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Bulletin Number: WRD-25R; Revised: 10/17/25

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STEP 14: After the ten minute recording has been completed, a pop-up will display asking if the
data is to be saved. Click “Yes”, select a destination for the data, and click “OK”. Once saving is
completed, click “OK” to continue.

STEP 15: Select “Exit to Home” located in the top left corner of the GTS+ application. The home
screen will then be displayed. Select the “Open Scan Data File” icon.

Select the saved file and click “OK” to continue.
NOTE: The file size, date, and time can help
ensure the correct file is selected.

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Bulletin Number: WRD-25R; Revised: 10/17/25

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STEP 16: Click the file icon located in the upper left corner. Open “Air Conditioner” and then
“Active Test”. Click the saved data.

STEP 17: Select “Refrigerant Outlet Temperature Sensor” and then click the “Graph” button. This
will allow the ten minute recording to be viewed.

NOTE: If the outside temperature is
under 77°F (25°C) and the inspection
mode is A/C OFF, click “ Change graph”
and change the display format to “Meter”
to make it easier to determine the
maximum temperature.

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STEP 18: Check the refrigerant outlet temperature and determine if the compressor requires
replacement. Refer to the tables below.
CAUTION: The method for checking data differs depending on the inspection mode with the A/C on
or off. This selection is based on the ambient air temperature confirmed in step 3.

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COMPRESSOR MOTOR AND RECEIVER TANK REPLACEMENT PROCEDURE
STEP 1: RECOVERY OF REFRIGERANT
(1)Turn READY ON and operate the compressor under the conditions shown below.
NOTE: This will collect most of the compressor oil from the various components of the air
conditioning system into the compressor, but, if the compressor is faulty, skip this step and go to
the next step.

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Bulletin Number: WRD-25R; Revised: 10/17/25

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(2) Turn the ignition switch off.
(3) Recover the refrigerant from the A/C system using a refrigerant recovery unit.

Caution: Do not release the refrigerant into the atmosphere when discharging it. Please ensure that it
is collected so that it can be reused when refilling.
Note: Use the refrigerant recovery device in accordance with the manufacturer’s instruction manual.

STEP 2: DISCONNECT NEGATIVE TERMINAL FROM AUXILIARY BATTERY
(1) Loosen the nut and disconnect the cable from the negative terminal of the auxiliary battery.

STEP 3: REMOVE CONSOLE REAR END PANEL SUB-ASSEMBLY
(1) Apply protective tape around the upper part of
console rear end panel sub-assembly as shown in the
illustration.
(2) Disengage the claws and clips to remove the
console rear end panel sub-assembly.

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Bulletin Number: WRD-25R; Revised: 10/17/25

Page 19 of 41

STEP 4: REMOVE SERVICE PLUG
Caution:

•
•
•