2020 Subaru Ascent Technical Service Bulletins

530 technical service bulletins (TSBs) are on record for the 2020 Subaru Ascent. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10169869Dec 11, 2019Electrical system. "In the interest of customer satisfaction, Subaru of America, Inc. (Subaru) is initiating a Service Program to reprogram the Engine Control Module (ECM) on certain 2019-2020MY Ascent and 2020MY Legacy & Outback vehicles. In some vehicles, the current software may cause the sub learning value control to operate improperly during the wake-up mode of the ECM. This could cause repeated erroneous learning of the…
• 10169872Dec 10, 2019Engine cooling. WUU-06 ECM Reprogramming for DTC C1424 Customer Satisfaction Service Program.
• 10169828Dec 3, 2019Engine cooling. This Service Information Bulletin provides the proper tightening / torque sequence to follow when installing Intake Duct #3 onto the intercooler assembly. Following the sequence below will insure the bolts remain fully tightened.
• 10168637Nov 18, 2019Electrical system, Equipment. "This Service Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16. In most cases involving this DTC, the following scenario(s) occur: • When trying to use the remote engine starter (RES) feature through Telematics (STARLINK / My Subaru app) the request is unsuccessful and the red Telematics indicator lamp illuminates. • The customer takes their vehicle to the…
• 10168571Nov 18, 2019Equipment, Electrical system. This bulletin provides troubleshooting steps to use when diagnosing specific and general audio/sound related concerns. Please start by completing the Harman Investigation Guide-Questionnaire as it gathers important details which will assist you with this diagnosis and is required should the condition not be resolved by this troubleshooting. Once the questionnaire is completed, follow the question flow based on the…
• 10168567Nov 18, 2019Equipment, Electrical system. This bulletin provides troubleshooting steps to follow when diagnosing a customer concern of the display screen being either frozen (unresponsive) or black (blank). Please start by completing the Harman Investigation Guide Questionnaire as it gathers important details which will help with diagnosis and will be required should the condition not be resolved by this troubleshooting. While completing the questionnaire…
• 10168565Nov 18, 2019Equipment, Electrical system. This bulletin provides troubleshooting steps to follow when diagnosing customer concerns of the Navigation system’s functionality. Please start by completing the Harman Investigation Guide Questionnaire as it gathers important details which will help with diagnosis and will be required should the condition not be resolved by this troubleshooting. While completing the questionnaire, follow the question flow based…
• 10168560Nov 18, 2019Equipment, Electrical system. This bulletin provides helpful information about operating conditions observed in the field for Technicians to use when diagnosing customer concerns which may arise while operating Harman Gen 3.0 and 3.1 Navigation and Display Audio systems. We will continue to add to this bulletin as more information becomes available.
• 10168627Nov 15, 2019Equipment, Electrical system. This bulletin provides troubleshooting steps to follow when diagnosing clock-related customer concerns. Please start by completing the Harman Investigation Guide Questionnaire as it gathers important details which will help with diagnosis and will be required should the condition not be resolved by this troubleshooting. While completing the questionnaire, follow the question flow based on the customer concern.
• 10168574Nov 15, 2019Equipment, Electrical system. This Service Information bulletin provides a procedure to use for addressing a customer concern of a delayed or slow response when using the soft keys on the touch screen of the audio / navigation head unit.
• 10168573Nov 15, 2019Electrical system, Equipment. This bulletin provides troubleshooting steps to use when diagnosing concerns of the Apple CarPlay and / or Android Auto feature not connecting or launching properly when a compatible device is connected to the head unit.
• 10168569Nov 15, 2019Electrical system, Equipment. This bulletin provides troubleshooting steps to follow when diagnosing customer concerns involving Bluetooth (BT) functionality. Please start by completing the Harman Investigation Guide Questionnaire as it gathers important details which will help with diagnosis and will be required should the condition not be resolved by this troubleshooting. While completing the questionnaire, follow the question flow based on…
• 10168566Nov 15, 2019Equipment, Electrical system. This Service Information Bulletin announces availability of a map update which includes new software to address a route searching error. A “Route Calculation Unsuccessful” message may be displayed when the selected route crosses state borders (e.g. Route 53 which crosses between Alabama and Tennessee).
• 10168563Nov 15, 2019Equipment, Electrical system. This bulletin provides troubleshooting steps to follow when diagnosing customer concerns regarding USB functionality. Please start by completing the Harman Investigation Guide Questionnaire as it gathers important details which will help with diagnosis and will be required should the condition not be resolved by this troubleshooting. While completing the questionnaire, follow the question flow based on the customer…
• 10168562Nov 15, 2019Equipment, Electrical system. This Service Information bulletin provides a procedure for customizing the maintenance period settings of the MFD. When accessing the Maintenance period information on the SSM4, the maintenance interval default values for mileage and number of months are different from those displayed on the MFD. This procedure describes how to synchronize the MFD and SSM4 values to insure proper customer notification.
• 10168600Nov 8, 2019Equipment, Electrical system. The following information addresses reprogramming file availability and a software update installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation head units utilized in the models as listed above. The procedure will involve either downloading the software update files from Subarunet (or using those sent directly from Nuspire) and transferring them onto a flash drive for head…
• 10166952Oct 25, 2019Suspension. This bulletin provides an inspection procedure to follow when addressing customer concerns of a rattling, knocking of klunk type sound when going over slight bumps and/ or uneven road surfaces.
• 10166949Oct 25, 2019Electrical system, Engine cooling. This bulletin announces availability of reprogramming files to optimize the Engine Control Module (ECM). The new files will address isolated concerns of an extended cranking (hard starting) condition. They will also address a DTC P1604 which may be stored in the ECM memory without illuminating the Check Engine light.
• 10166918Oct 21, 2019Electrical system. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure. The exchange program policy can also be found in Sections 8.4.9 and 11.2.10 of your Claims Policies and Procedures Manual found in Subarunet.
• 10166913Oct 18, 2019Electrical system. This Service Information Bulletin provides the answer to potential inquiries regarding the STARLINK app being unable to play music files stored on a customer’s Android® phone / device through the head units (H/U) used in the applicable models listed above. This information is applicable ONLY to Android devices operating with Operating System (OS) version 10. IOS (AppleTM) devices are not affected.
• 10165553Sep 30, 2019Seats. This bulletin announces availability of redesigned leather seat cushion trim covers to address isolated customer concerns of wrinkles appearing during early stages of vehicle use as shown in the example photo below. The new covers utilize materials with higher durability and resistance to wrinkling.
• 10165548Sep 26, 2019Electrical system. This Service Information Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16. In most cases involving this DTC, the following scenario(s) occur: • When trying to use the remote engine starter (RES) feature through Telematics (STARLINK / My Subaru app) the request is unsuccessful and the red Telematics indicator lamp illuminates.
• 10165497Sep 26, 2019Transmission and drivetrain. This bulletin has been developed in response to a small number of customer concerns regarding fluid seepage found coming from the CVT assembly. Investigation has identified likely sources of the seepage to be the sealant used on the CVT’s oil pump chain cover and the input shaft oil seal. The repair involves chain cover removal, a thorough cleaning and inspection of the sealing surfaces followed by re-sealing the…
• 10165507Sep 18, 2019Equipment, Electrical system. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure. The exchange program policy can also be found in Sections 8.4.9 and 11.2.10 of your Claims Policies and Procedures Manual found in Subarunet.
• 10164446Aug 29, 2019Transmission and drivetrain. "This bulletin has been developed in response to a small number of customer concerns regarding fluid seepage found coming from the CVT assembly. Investigation has identified likely sources of the seepage to be the sealant used on the CVT’s oil pump chain cover and the input shaft oil seal. The repair involves chain cover removal, a thorough cleaning and inspection of the sealing surfaces followed by re-sealing…
• 10164278Aug 29, 2019Electrical system, Seats. This bulletin announces a change made to blower unit assemblies used for front seat cushion and backrest ventilation. The change was made in response to a small number of customer concerns regarding vibration and excessive airflow-type sound levels.
• 10232535Jul 17, 2014Electrical system. Replacement Key and Immobilizer Info
• 10232894Mar 7, 2014Engine cooling. Effective with all 2015 model year cars and forward, the oil change interval is changing to 6,000 miles or 6 months, whichever comes first.
• 10233119Apr 25, 2013Engine cooling. Oil Filler Cap Gasket Coming Unseated
• 10232869Feb 19, 2013Equipment, Other or unknown. Puddle Light Recall

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