Reprogramming File Availability for DTC P0841 – 2018 Subaru

NHTSA ID Number: 10155222

Manufacturer Communication Number: 16-111-18R

Summary

This bulletin announces reprogramming file availability to optimize the Transmission Control Module (TCM) used with the TR580 CVT. Contamination in a fluid pressure solenoid valve can cause a DTC P0841. The new logic will allow the solenoid to operate in a manner enabling it to discharge the contamination.

 

5 Affected Products

Vehicles

SUBARU	CROSSTREK	2018
SUBARU	FORESTER	2018
SUBARU	IMPREZA	2018
SUBARU	LEGACY	2018
SUBARU	OUTBACK	2018

 

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INTRODUCTION:

This bulletin announces reprogramming file availability to optimize the Transmission Control Module (TCM) used with the TR580 CVT.  Contamination in a fluid pressure solenoid valve can cause a DTC P0841.  The new logic will allow the solenoid to operate in a manner enabling it to discharge the contamination.

 

PRODUCTION CHANGE INFORMATION:

The new logic has been incorporated into production starting with the VINs listed in the table below:

Vehicle / Model	Starting VIN
2018MY Legacy	J*018847
2018MY Outback	J*249489
2018MY Forester w/o Paddle Shift	J*493398
2018MY Forester w/ Paddle Shift	J*501580
2018MY Impreza 4-Door	J*608695
2018MY Impreza 5-Door	J*720367
2018MY Crosstrek	J*261233

 

PACK FILE APPLICABILITY:

NOTE:  These new reprogramming files are being supplied in the January 2018 SSM update.

Model / Applicability	PAK File Name	New TCM Part Number	Old TCM Part Numbers	Decryption Keyword	New CID  Number
2018MY LEGACY	30919AF65B.pak	30919AF65B	30919AF65A	FCE94C46	BCF2008000
2018MY OUTBACK	30919AF66B.pak	30919AF66B	30919AF66A	277CA38F	BCF2408000
2018MY FORESTER W/O PADDLE SHIFT	30919AF831.pak	30919AF831	30919AF830	196A8490	DCF2608000
2018MY FORESTER W/ PADDLE SHIFT	30919AF841.pak	30919AF841	30919AF840	8DF797E9	DCF2408000
2018MY IMPREZA W/O PADDLE SHIFT	30919AG31C.pak	30919AG31C	30919AG31A, B	n/a	Q4F52700
2018MY IMPREZA W/ PADDLE SHIFT	30919AG32C.pak	30919AG32C	30919AG32A, B	n/a	Q4F50700
2018MY CROSSTREK W/O PADDLE SHIFT	30919AF212.pak	30919AF212	30919AF210, 11	n/a	R3F56700
2018MY CROSSTREK W/ PADDLE SHIFT	30919AF132.pak	30919AF132	30919AF130, 31	n/a	R3F54700

 

SERVICE PROCEDURE / INFORMATION:

Step 1:  Reprogram the TCM using the SSM4 following the normal FlashWrite procedure.

NOTES:

SOA now highly recommends connecting the Midtronics GR8 Diagnostic Battery Charger to the vehicle and utilizing the Power Supply Mode feature anytime a vehicle control module is being reprogrammed.  Once the GR8 is connected to the vehicle and as long as the battery is fully charged, it takes less than 3 minutes to boot-up the charger, select the Power Supply Mode, and have the battery voltage stabilized and ready for reprogramming.

VERY IMPORTANT: This information is applicable to the Midtronics GR8 Diagnostic Battery Charger ONLY. It does not apply to any other brand / type of “generic” battery charger

Last update on 2026-06-13 / Affiliate links / Images from Amazon Product Advertising API

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whatsoever.  ONLY the GR8 and its Power Supply Mode feature has been tested and approved by Subaru of America, Inc. (SOA).

• If the GR8 indicates the vehicle’s battery must be charged, charge the battery using the GR8 before proceeding to reprogram the vehicle while using the Power Supply Mode.
• Control module failures as a result of 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.

 

Step 2:  Using the SSM4, clear the AT Learning Data using the following procedure:

• Start > Diagnosis > Vehicle Selection > Each System > Transmission > Work Support > Clear AT Learning Data.
• Click “YES” and when “Execute Clear AT Learning” is displayed, click “YES” again.
• Turn the ignition OFF, wait at LEAST 30 seconds then turn the ignition back ON. At this point, the AT Temp light will start blinking; 4 times in 2 seconds to signify the Clear AT Learning procedure has completed successfully. If the AT Temp light does not flash as described, repeat Step 2 again from the beginning.

 

Step 3:  Using the SSM4, perform the AT Learning Control following the procedure outlined Service Manual excerpt supplied below:

1. PREPARATION FOR LEARNING:
   1. Warm up or cool down until the ATF temperature displayed on the Subaru Select Monitor is 40-65°C (104-149°F).
   2. After stopping the vehicle, shift the select lever to “P” range.
   3. Fully apply the parking brake.
   4. Raise the vehicle.

CAUTION:

While working, be sure to keep the lower edge of the tires 30 cm or more above the ground as vehicle will vibrate.

5. Connect the Subaru Select Monitor to data link connector.
6. Turn the ignition switch to ON.
7. Turn off all switches causing an electrical load, e.g. headlights, A/C, seat heater and rear defogger, etc.
8. SIMPLE LEARNING:

NOTE:  Simple learning is performed with the vehicle lifted, without actually running the vehicle.

CAUTION:  Do not turn the power of the Subaru Select Monitor OFF during work, and do not disconnect the data link connector.

1. Select {Work Support} in the «Transmission Diagnosis» display screen of the Subaru Select Monitor.
2. Select {Compulsory learning mode} in the «Work Support» display screen of the Subaru Select Monitor.
3. Follow the messages displayed on the Subaru Select Monitor screen when working.

NOTE: During AT learning in progress, AT OIL TEMP light in the combination meter starts flashing at 2 Hz and the learning operation starts. The following message is displayed on the screen when the AT OIL TEMP light which was flashing at 2 Hz turns off.

4. When «AT learning normally ended.» is displayed, simple AT learning is completed.

NOTES:

• If a communication error occurs during learning, retry the “AT learning mode” from the beginning.
• If the message «Execute AT learning again after fixing troubles of the vehicle» appears during learning, select [OK] and display the DTC list. After repairing the locations indicated by the DTC, start the “AT learning mode” over from the beginning.
• When a communication error occurs during learning, select lever does not shift occasionally. If select lever does not shift, turn the ignition switch to OFF before operating the select lever.
• If the message «AT learning ended abnormally.» is displayed, start the “AT learning mode” over from the be List of Main Causes for Abnormal Termination:
  • Fault is detected during AT learning.
  • The accelerator pedal is depressed during AT learning.
  • An unspecified operation was performed during AT learning
  • ATF temperature becomes out of specification during AT learning.
  • Battery voltage is low. hh Malfunction indicator light illuminates.
  • Hybrid fail lamp illuminates. hh Parking brake not applied strongly enough.
  • Brake pedal is not fully depressed. hh Abnormal idle speed increase, etc.
• For detailed operation procedures, refer to “PC application help for Subaru Select Monitor”.

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NUMBER: 16-111-18R
DATE: 01/30/18
REVISED: 02/20/19
https://www.nhtsa.gov/recalls?nhtsaId=10155222

https://static.nhtsa.gov/odi/tsbs/2019/MC-10155222-9999.pdf

 

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Reprogramming

What J2534 reprogramming capabilities are available?

(4a) J2534 Reprogramming

Subaru reprogramming files using a generic (non-OEM) SAEJ2534 pass-thru vehicle programming device are available by contacting Service Technical Information Company toll free at 1-866-428-2278. The cost for the CD-ROM with all reprogramming files is $75.00 plus S/H and applicable state tax. Files will be updated four (4) times per year, in CD-ROM format, with all available reprogramming service information at the same above offered cost. Authorized Subaru Dealers are provided the same reprogramming information.

Before purchasing, the reprogramming details can be found in the following Reprogramming J-2534 Files chart. Click the link to view the PDF chart.

Subaru J2534 Reprogramming software meets the latest available J2534-1 specification. Our Reprogramming J2534 Files chart does not specify the Calibration Identification Number (CID); however, this information is included in our offered CD-Rom.

Note: The ECM or TCM being reprogrammed may already contain some or all of the reprogramming files listed in the Reprogramming J2534 Files chart shown by release date. It is possible to damage the vehicles ECM/TCMduring the reprogramming event. Once the reprogramming process has started, it is recommended not to interrupt the process until the event is completed. If you experience any problems, please contact your scan tool maker for further instructions.

 

(4b) Are all pre-2004MY Subaru vehicles compatible with J2534?

No. Subaru has no reprogramming capability for model years 1996-1998. Starting with our 1999 model year, please see our Reprogramming Pre-J2534 Files chart for affected model reprogramming information.

Both pre-J2534 reprogramming and J2534 pass thru reprogramming files are included in the offered HDS kit software for aftermarket service provider application.

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https://techinfo.subaru.com/

 

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Last update on 2026-06-11 / Affiliate links / Images from Amazon Product Advertising API

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