NHTSA ID Number: 11022300
Manufacturer Communication Number: 09-131-25R
TSB/Document Date: 2025-09-02
Summary
This bulletin announces the diagnostic procedures and availability of reprograming files to rectify the following Diagnostic Trouble Codes (DTCs). • P2404: EVAP System Leak Detection Pump Sense Circuit Range/Performance. • P0420: Catalyst System Efficiency Below Threshold Bank 1. (not applicable for 15-18 models)
ATTENTION:
GENERAL MANAGER
q
PARTS MANAGER
q
CLAIMS PERSONNEL
q
IMPORTANT - All
Service Personnel
Should Read and
Initial in the boxes
provided, right.
SERVICE MANAGER
q
© 2025 Subaru
of America, Inc. All rights reserved.
SERVICE BULLETIN
APPLICABILITY:
SUBJECT:
2015-21MY WRX/STI 2.5L Turbo MT
NUMBER: 09-131-25
Diagnosis Procedures for DTCs P2404 & P0420
DATE:
03/04/25
REVISED: 08/11/25
INTRODUCTION:
This bulletin announces the diagnostic procedures and availability of reprograming files to rectify the
following Diagnostic Trouble Codes (DTCs).
•
P2404: EVAP System Leak Detection Pump Sense Circuit Range/Performance.
•
P0420: Catalyst System Efficiency Below Threshold Bank 1. (not applicable for 15-18
models)
The ELCM may accumulate condensation causing the inaccurate detection of P2404. P0420 may
become falsely detected due to unstable combustion caused by a downshift. The new reprogramming
files contains enhanced software allowing for condensation conditions and downshift rotational
speeds be more accurately detected by the Engine Control Module (ECM). If P2404 and/or P0420 are
found to be detected by the ECM, perform the service procedures outlined in this bulletin.
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: 09-131-25R; Revised: 08/11/25
Page 1 of 4
PAK FILE APPLICABILITY:
MY
File Description
Old Part #
Decryption Keyword
New CID
15MY
22765AF583.pak
22765AF580
22765AF581
22765AF582
BB629AC2
AE5R300V
22765AH604.pak
22765AH600
22765AH601
22765AH602
22765AH603
84BC55EE
AE5T400V
17MY
22765AK174.pak
22765AK170
22765AK171
22765AK172
22765AK173
8C286F89
AE5W300V
18MY
22765AK923.pak
22765AK920
22765AK921
22765AK922
611EAA24
AE5Z130V
18MY
Type RA
22765AM272.pak
22765AM270
22765AM271
95573C7D
AE5Z130W
19MY
22765AM462.pak
22765AM460
22765AM461
315FDC7F
AE5Z340V
20MY
22765AN542.pak
22765AN540
22765AN541
EB31D0C7
AE5Z520V00G
21MY
22765AR201.pak
22765AR200
48D3781B
AE5Z900A00G
16MY
Continued...
Bulletin Number: 09-131-25R; Revised: 08/11/25
Page 2 of 4
SERVICE PROCEDURE / INFORMATION:
Procedure when DTC P0420 is present:
If DTC P0420 is detected, reprogram the ECM using the standard FlashWrite procedure. Then,
follow the diagnostic steps outlined in bulletin 09-110-23R.
Procedure when DTC P2404 is present:
If DTC P2404 is detected, follow the troubleshooting tree in the applicable Service Manual. After
completing the diagnostics, reprogram the ECM perform the standard FlashWrite procedure.
WARRANTY / CLAIM INFORMATION:
For vehicles within the Basic New Car Limited, an applicable Emission Warranty period or covered
by an active Subaru Added Security Classic or Gold plan, this repair may be submitted using the
following claim information:
Labor Description
Labor Operation #
Labor Time
Fail Code
MFI OBDII REPROGRAMMING, ENGINE CONTROL
MODULE
B455288
.4h
UPG-48
IMPORTANT: Always note the original Calibration Identification number (CID) the vehicle came in
with on the repair order before reprogramming and, make sure to list the NEW CID for any newlyinstalled programming (as confirmed from the actual control module AFTER installation). The
NEW CID MUST also be noted on the repair order as this information is required for entry in the
Miscellaneous Detail field during claim submission.
NOTE: The PAK file listings provided in this bulletin are the latest available at the time of
publishing. Updates are often released thereafter without revision to the original bulletin. For this
reason, it is critical to always have the latest version of Select Monitor software installed on your
system. You can confirm if a later version is available by entering the CID listed in this bulletin into
FlashWrite. If a newer CID is shown as available in FlashWrite, reprogram using that file.
IMPORTANT REMINDERS:
•
SOA strongly discourages the printing and/or local storage of service information as
previously released information and electronic publications may be updated at any time.
•
Always check for any open recalls or campaigns anytime a vehicle is in for servicing.
•
Always refer to STIS for the latest service information before performing any repairs.
Continued...
Bulletin Number: 09-131-25R; Revised: 08/11/25
Page 3 of 4
APPENDIX A
BATTERY CHARING INFORMATION
Subaru of America, Inc. (SOA) highly recommends utilizing either the Subaru Midtronics DCA8000 Dynamic Diagnostic Charging System or the Subaru Midtronics GR8-1100 Diagnostic Battery
Charger to the vehicle in the Power Supply Mode feature anytime a vehicle control module is
being reprogrammed. Once the Midtronics charger is connected to the vehicle, if the battery is fully
charged, it will take less than three (3) minutes to boot-up the charger, select the Power Supply Mode,
and have the battery voltage stabilized and ready for reprogramming.
NOTES:
•
For instructions on using the Power Supply Mode, reference the applicable User Manual for the
Midtronics DCA-8000 Dynamic Diagnostic Charging System and the Midtronics GR8-1100
Diagnostic Battery Charger on STIS.
•
Confirm all electrical loads such as lights, audio, HVAC, seat heaters, and rear defroster are all
switched OFF before setting up the charger for Power Supply Mode.
•
Select the correct battery type (Enhanced Flooded, Flooded, Gel, AGM or AGM Spiral).
•
Input the CCA which matches the vehicle’s battery. NOTE: OE and replacement batteries have
different CCA ratings. Always confirm the battery’s CCA rating before proceeding.
•
If using a DCA-8000 Dynamic Diagnostic Charging System, set the power supply voltage to 13.5
Volts.
•
DO NOT connect the DST-i or DST-010 until the Power Supply mode function has completed its
battery test mode and the Charging Voltage has dropped to and shows a steady 13.5 Volts on the
display.
•
Once Power Supply Mode reaches a steady 13.5 Volts, connect the DST-i or DST-010 to the OBD
connector and proceed with initiating the normal FlashWrite reprogramming process.
•
Amperage will fluctuate based upon the vehicle’s demand for power. NOTE: If the voltage rises
beyond 14 Volts while programming is in process, the procedure will abort. This can indicate a
need to test or charge the vehicle battery before any further attempt at programming is made.
•
ALWAYS set the power supply voltage to 13.5 Volts when using Power Supply Mode. NEVER
turn the ignition switch on when charging at voltages 15 Volts or higher.
REMINDER: If the DCA-8000 or GR8-1100 indicates the vehicle’s battery must be charged, charge
the battery fully before proceeding to reprogram the vehicle while using the Power Supply Mode.
NOTE: Control module failures resulting from battery discharge during reprogramming are not a
matter for warranty. Should any DTCs reset after the reprogramming update is performed, diagnose
per the procedure outlined in the applicable Service Manual.
VERY IMPORTANT:
This information is applicable to the Subaru Midtronics DCA-8000 Dynamic Diagnostic Charging
System and the Subaru Midtronics GR8-1100 Diagnostic Battery Charger ONLY. It does not apply to
any other brand / type of “generic” battery charger whatsoever. ONLY the DCA-8000 and the GR81100 and their Power Supply Mode feature have been tested and approved by SOA.
Bulletin Number: 09-131-25R; Revised: 08/11/25
Page 4 of 4
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TSB/Document ID: 09-131-25R
Replacement Service Bulletin Number:
MFR Communication Date: 2025-08-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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