Engine in Fail-Safe Mode / DTCs P0088, P0087, P0021, P0014, P0011, P0024, P1604, P0016, P0017, P0018, P0019, P0128, & P050B – 2022 Subaru WRX

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Bulletin Number: 09-94-22; Date: 01/24/23 Page 1 of 12 SERVICE BULLETIN Continued… 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. NUMBER: 09-94-22 DATE: 01/24/23 APPLICABILITY: 2022MY WRX SUBJECT: Engine in Fail-Safe Mode / DTCs P0088, P0087, P0021, P0014, P0011, P0024, P1604, P0016,P0017, P0018, P0019, P0128, & P050B INTRODUCTION: This bulletin announces the availability of new reprograming files for the Engine Control Module (ECM) developed to remedy the following DTCs: • P0088: Fuel Rail/System Pressure – Too High Bank 1 • P0087: Fuel Rail/System Pressure – Too Low Bank 1 • P0011: “A” Camshaft Position – Timing Over-Advanced Or System Performance Bank 1 • P0021: “A” Camshaft Position – Timing Over-Advanced Or System Performance Bank 2 • P0014: “B” Camshaft Position – Timing Over-Advanced Or System Performance Bank 1 • P0024: “B” Camshaft Position – Timing Over-Advanced Or System Performance Bank 2 • P0016: Crankshaft Position – Camshaft Position Correlation Bank 1 Sensor A • P0017: Crankshaft Position – Camshaft Position Correlation Bank 1 Sensor B • P0018: Crankshaft Position – Camshaft Position Correlation Bank 2 Sensor A • P0019: Crankshaft Position – Camshaft Position Correlation Bank 2 Sensor B • P0128: Coolant Thermostat – Engine Coolant Temperature Below Thermostat Regulating Temperature. • P050B: Cold Start Ignition Timing Performance These files contain enhanced logic to providing a more precise fuel pressure detection program to help prevent any unnecessary DTCs. If any of the DTCs listed above are found to be stored in the ECM, follow the procedures outlined below. ATTENTION: GENERAL MANAGER q PARTS MANAGER q CLAIMS PERSONNEL q SERVICE MANAGER q IMPORTANT – All Service Personnel Should Read and Initial in the boxes provided, right. ©2022 Subaru of America, Inc. All rights reserved. Bulletin Number: 09-94-22; Date: 01/24/23 Page 2 of 12 PRODUCTION CHANGE INFORMATION: The new programing files have been incorporated into vehicle production as per the table below. MY Model Transmission Starting VIN 22 WRX MT N9019307 CVT N8019298 PACK FILE APPLICABILITY: MY Model Trans File Description Decryption Keyword New CID # 22 WRX CVT 22765AR884.pk2 A1D47BEA LHGHA10C00G MT 22765AR894.pk2 8C3B9B77 LHGHA10B00G These new files are included in the July 2022 SSM software update. SERVICE PROCEDURE / INFORMATION: Continued… Bulletin Number: 09-94-22; Date: 01/24/23 Page 3 of 12 Continued… (*1) Instructions on how to perform and read the OBD MODE test results. This procedure will be required when performing the diagnostic Steps outlined below. Read the following data monitor values: 1. MID – $35 TID – $8B 2. MID – $35 TID – $8C 3. MID – $35 TID – $8D 4. MID – $35 TID – $8E 5. MID – $36 TID – $8B 6. MID – $36 TID – $8C 7. MID – $36 TID – $8D 8. MID – $36 TID – $8E Bulletin Number: 09-94-22; Date: 01/24/23 Page 4 of 12 Continued… STEP 1: Are DTCs P0016,17,18 or 19 found to be displayed within the fault memory? NO – Perform the reprograming procedure outlined in STEP 2 ONLY. The service procedure is finished, no further action is required. YES – Proceed to STEP 2 and continue to the proceeding steps. STEP 2: Reprogram the ECM following the normal FlashWrite procedure. Subaru of America, Inc. (SOA) highly recommends connecting either the Subaru Midtronics DCA8000 Dynamic Diagnostic Charging System or the Subaru Midtronics GR8-1100 Diagnostic Battery Charger to the vehicle and utilizing 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 takes 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 Bulletin Number: 09-94-22; Date: 01/24/23 Page 5 of 12 Continued… 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 GR8- 1100 and their Power Supply Mode feature have been tested and approved by SOA. End of procedure for vehicles WITHOUT DTCs P0016, P0017, P0018, or P0019 store in the ECM. STEP 3: Using SSM, read the value the following four data monitor items (ALWAYS Save SSM Data): 1. VVT Initial Position Learning Value #1 2. VVT Initial Position Learning Value #2 3. VVT EX Initial Position Learning Value #1 4. VVT EX Initial Position Learning Value #2 Are all of the data monitor item values within the acceptable range listed in the table above? YES – proceed to STEP 5. NO – proceed to STEP 4. STEP 4: Perform the procedures outlined in “#7 INSPECTION MODE N” and “#12 INSPECTION MODE T”. Then re-check the threshold values in STEP 3 along with the OBD MODE test results (*1) “#7 INSPECTION MODE N” procedure. Using the applicable Service Manual, refer to: DIAGNOSTICS > ENGINE> Inspection Mode > #7 INSPECTION MODE N A. Confirm the battery voltage is 12 Volts or more and the fuel tank is at least half full. B. Using SSM, clear the fault memory. Prepare the SSM to be kept in the vehicle during the following road test. Bulletin Number: 09-94-22; Date: 01/24/23 Page 6 of 12 Continued… C. With gear selector in the park position (neutral for MT models), idle the engine at approximately 2500 rpm for 40 seconds or more. D. Move the gear selector into the drive position (appropriate gear range for MT models. Accelerate the vehicle to 31 mph or more. E. When the vehicle speed is 31 mph or more, release the accelerator pedal and brake pedal (and clutch for MT models) and allow the vehicle to decelerate with any gear shift changes. Maintain the engine speed between 2500 rpm to 1900 rpm for 5 seconds during this deceleration. NOTE: Depending on road conditions, an appropriate gear might have to be selected to maintain the desired engine speed. The vehicle speed is not important as long as the engine speed is within range during the declaration. F. In a suitable area, safely bring the vehicle full stop and allow it to idle for 5 minutes. “#7 INSPECTION MODE N” procedure is complete. Proceed to “#12 INSPECTION MODE T” procedure. “#12 INSPECTION MODE T” procedure. Using the applicable Service Manual, refer to: DIAGNOSTICS > ENGINE> Inspection Mode > #12 INSPECTION MODE T A. Confirm the battery voltage is 12 Volts or more the fuel is at least half full. B. Start the engine. C. Allow the engine to idle for at least 3 minutes. D. Accelerate the vehicle speed to approximately 37 mph. E. While maintaining approximately 37 mph, cycle the accelerator from a 0% to 20% opening angle. Try to keep these cycles within 5 second intervals. Maintain this driving pattern for 20 minutes or more. NOTE: It is acceptable to stop the vehicle if needed depending on road/traffic conditions during this driving pattern. F. Release the accelerator pedal and brake pedal (and clutch for MT models) and allow the vehicle to decelerate with any gear shift changes. G. In a suitable area, safely bring the vehicle full stop and turn off the engine. Bulletin Number: 09-94-22; Date: 01/24/23 Page 7 of 12 Continued… “#12 INSPECTION MODE T” procedure is complete. Read the threshold values from STEP 3 (pictured below) and the OBD MODE test results (*1) Are all of the data monitor item values within the acceptable range listed in the table below? Are the threshold values between -1500 to + 1500? YES – The procedure is FINISHED. NO – Repeat STEP 4 ONE TIME ONLY and if the result answer is still “NO”, proceed to STEP 6. STEP 5: Perform the “#7 INSPECTION MODE N” and “#12 INSPECTION MODE T” procedure. “#7 INSPECTION MODE N” procedure. Using the applicable Service Manual, refer to: DIAGNOSTICS > ENGINE> Inspection Mode > #7 INSPECTION MODE N A. Confirm the battery voltage is 12 Volts or more the fuel is at least half full. B. Using SSM, clear the fault memory. Prepare the SSM to be kept in the vehicle during the following road test. C. With gear selector in the park position (neutral for MT models), idle the engine at approximately 2500 rpm for 40 seconds or more. D. Move the gear selector into the drive position (appropriate gear range for MT models. Accelerate the vehicle to 31 mph or more. Bulletin Number: 09-94-22; Date: 01/24/23 Page 8 of 12 Continued… E. When the vehicle speed is 31 mph or more, release the accelerator pedal and brake pedal (and clutch for MT models) and allow the vehicle to decelerate without any gear shift changes. Maintain the engine speed between 2500 rpm to 1900 rpm for 5 seconds during this deceleration. NOTE: Depending on road conditions, an appropriate gear might have to be selected to maintain the desired engine speed. The vehicle speed is not important as long as the engine speed is within range during the declaration. F. In a suitable area, safely bring the vehicle full stop and allow it to idle for 5 minutes. “#7 INSPECTION MODE N” procedure is complete. Proceed to “#12 INSPECTION MODE T” procedure. “#12 INSPECTION MODE T” procedure. Using the applicable Service Manual, refer to: DIAGNOSTICS > ENGINE> Inspection Mode > #12 INSPECTION MODE T H. Confirm the battery voltage is 12 Volts or more the fuel is at least half full. I. Start the engine. J. Allow the engine to idle for at least 3 minutes. K. Accelerate the vehicle speed to approximately 37 mph. L. While maintaining approximately 37 mph, cycle the accelerator from a 0% to 20% opening angle. Try to keep these cycles within 5 second intervals. Maintain this driving pattern for 20 minutes or more. NOTE: It is acceptable to stop the vehicle if needed depending on road/traffic conditions during this driving pattern. M. Release the accelerator pedal and brake pedal (and clutch for MT models) and allow the vehicle to decelerate with any gear shift changes. N. In a suitable area, safely bring the vehicle full stop and turn off the engine. “#12 INSPECTION MODE T” procedure is complete. Bulletin Number: 09-94-22; Date: 01/24/23 Page 9 of 12 Continued… O. Using SSM, select Diagnosis > Each System > Engine > DTC > Readiness Code P. Read the readiness codes for P0016, P0017, P0018, P0019, P000A, P000B, P000C, and P000D. Confirm the self-diagnosis is complete and that the codes are not pending. Q. Check the DTC and data monitor threshold values. Using SSM, select Diagnosis > Select Vehicle > OBD System – Each System > ECM-EngineControl > OBD MODE test results (*1) Are there NO DTCs present and the threshold values between -1500 to + 1500? YES – The procedure is FINISHED. NO – Proceed to STEP 6 STEP 6: Inspect the engine oil level and condition. IMPORTANT: If the engine oil and filter were replaced prior to diagnosis, there is no need for inspection. Proceed to STEP: 7. Is there any abnormal condition or Inappropriate oil level?? YES – Perform the engine oil and filter change. Repeat STEP 4 and STEP 5, then continue diagnosis. NO – Proceed to STEP 7 Bulletin Number: 09-94-22; Date: 01/24/23 Page 10 of 12 Continued… STEP 7: Performed the outlined timing chain inspection outlined below: IMPORTANT: If the timing chain was replaced prior to diagnosis, there is no need to perform the inspection. Proceed to STEP 8. A. Using SSM, clear the fault memory. B. Switch the ignition to the “OFF” position. C. Disconnect the oil control solenoid valve connector on the bank with associated DTC. D. Switch the ignition switch to the “ON” position. E. Using SSM and the engine not running, read the “VVT Advance Angle Value” data monitor value. F. Start the engine and read the “VVT Advance Angle Value” data monitor value for a duration of 10 seconds. G. Switch the ignition to the “OFF” position. Is the “VVT Advance Angle Value” data monitor value out of -10 degrees to +10 degrees? YES – Adjust and / repair the timing chain as needed. Repeat STEP 4 and STEP 5, then continue diagnosis. NO – Proceed to STEP 8. STEP 8: Perform a visual inspection of the engine harness and the connectors specified below for any physical damage. IMPORTANT: If the engine harness was replaced prior to diagnosis, there is no need to perform the inspection. Proceed to STEP 9. Connectors: • ECM • Oil Control Solenoid • CAM Position Sensor • Crank Position Sensor Was there any damage found? YES – Repair the damaged harness and / or connector. Repeat STEP 4 and STEP 5, then continue diagnosis. NO – Proceed to STEP 9. STEP 9: Perform the following Ohm tests: Bulletin Number: 09-94-22; Date: 01/24/23 Page 11 of 12 Continued… A. Switch the ignition to the “OFF” position. B. Disconnect the ECM and the Crank Position Sensor. Disconnect the Oil Control Valve and Cam Position Sensor associated with the DTC. C. Measure the resistance between the following and record the results: Connector E158 Pin 99 & Connector E38 Pin 2 Connector E158 Pin 78 & Connector E36 Pin 2 Connector E158 Pin 66 & Connector E10 Pin 1 Are there resistance values 1 Ohm or higher? YES – Replace the damaged harness. Repeat STEP 4 and STEP 5, then continue diagnosis. NO – Proceed to STEP 10. STEP 10: Perform and engine oil pressure test as per the applicable Service Manual: Engine > Mechanical > Engine Oil Pressure > INSPECTION Was the engine oil pressure found to be within specification? NO – Inspect the engine oil strainer. Clean or replace any needed parts depending on the inspection results. Repeat STEP 4 and STEP 5, then continue diagnosis. YES – Proceed to inspect the items listed below in the following order. Clean or replace the needed parts depending on the inspection results. Repeat STEP 4 or STEP 5, then continue diagnosis. • Oil Passages in the Chain Cover • Oil Passages in the Cam Sprocket • Cam Carriers (possible scoring) Bulletin Number: 09-94-22; Date: 01/24/23 Page 12 of 12 WARRANTY / CLAIM INFORMATION: For vehicles within the Basic New Car Limited Warranty period, Emissions Defect Warranty or covered by an active Subaru Added Security Classic or Gold plan, this repair may be submitted using the following claim information: For ECM reprograming ONLY Labor Description Labor Operation # Labor Time Fail Code REPROGRAMMING, ENGINE CONTROL MODULE* A455-288 .4 UPG-48 *New/Installed CID number will be required for claim submission For Situations Continuing after Step 4 or 5 of the Work Procedure. When further Diagnosis and repairs are needed an additional job line / repair claim can be submitted. Please refer to the Subaru Labor Time Guide for warranty time and coverage. Below is a possible EXAMPLE. For vehicles within the Basic New Car Limited Warranty period or covered by an active Subaru Added Security Classic or Gold plan, a repair may be submitted using the following claim information: Labor Description Labor Operation # Labor Time Fail Code OBDII OIL CHANGE TO FIX AVCS OPERATION A455-443 1.0 BAT-42 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.

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