2019 Subaru Ascent Technical Service Bulletins

638 technical service bulletins (TSBs) are on record for the 2019 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.

• 10174512Apr 8, 2020Electrical system. This bulletin is designed to address an error code 202 and/or 204 when attempting to complete the STARLINK Telematics subscription process.
• 10174511Apr 6, 2020Latches, locks and linkages, Body and structure, Equipment. This bulletin announces a design change made to the front door weatherstrips to prevent interference with the leading edge of the rear doors under certain circumstances.
• 10174509Apr 2, 2020Electrical system, Transmission and drivetrain. This bulletin announces availability of a new transmission harness for use when diagnosis of DTC P0842 - TRANSMISSION FLUID PRESSURE SENSOR/ SWITCH "A" CIRCUIT LOW.
• 10173195Mar 31, 2020Electrical system, Equipment. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize effciency while addressing customer concerns.
• 10173190Mar 26, 2020Electrical system, Equipment. This service bulletin announces the addition of diagnostics for DTC B224C: RADIO ANTENNA FAULTS to the service manuals of the models listed.
• 10173186Mar 26, 2020Equipment, Electrical system. This service bulletin provides details of a correction to the diagnostic procedure for DTC B2350- REAR RADAR COMMUNICATION ERROR on the models listed.
• 10173135Mar 20, 2020Electrical system, Body and structure, Latches, locks and linkages. This Service Information Bulletin provides insight on how to address a customer concern of the rear hatch, Power Rear Gate (PRG) or trunk release operating (or finding the PRG/trunk open unexpectedly after parking) without a specific input (button press) from the operator.
• 10173127Mar 19, 2020Electrical system, Air bags, Equipment. This bulletin provides information regarding Event Data Recorder (EDR) functionality which has been incorporated into the airbag system.
• 10173121Mar 16, 2020Electrical system, Body and structure. This bulletin announces a design change made to the PRG control module. This change is in response to a limited number of customer concerns regarding the rear gate not opening when operating the gate switch or dashboard switch on the vehicle or the button on the key fob. In addition to ensuring proper PRG system operation, the new logic also optimizes the PRG communication function.
• 10173120Mar 16, 2020Electrical system, Body and structure. This bulletin announces a design change made to the PRG control module. This change is in response to a limited number of customer concerns regarding the rear gate not opening when operating the gate switch or dashboard switch on the vehicle or the button on the key fob. In addition to ensuring proper PRG system operation, the new logic also optimizes the PRG communication function.
• 10173109Mar 4, 2020Body and structure, Equipment. This bulletin announces availability of new outer door handles to address isolated concerns of the chrome finish peeling.
• 10173027Mar 3, 2020Engine cooling, Equipment, Electrical system. The purpose of this bulletin is to provide a description of current changes to Service Manuals available via the Subaru Technical Information System (STIS) web site.
• 10171950Feb 21, 2020Electrical system. This Service Information bulletin describes a change made to the labels applied to the push to start switches used on the models listed.
• 10171942Feb 21, 2020Equipment. This bulletin announces availability of reprogramming files to optimize the Body Integrated Unit (BIU) operation of the automatic door lock (auto-lock / unlock) feature.
• 10171939Feb 21, 2020Equipment. This bulletin details an important regulation issued by the National Highway Traffic Safety Administration (NHTSA) which impacts the way some vehicles with accessories are sold. This regulation applies to any automobile retailer installing accessories on a vehicle prior to its first sale.
• 10171935Feb 21, 2020Equipment. WUW-08 PCV; There has been an interruption in the supply of part numbers 11810AA230 and X1181AA010 from Japan.
• 10171932Feb 19, 2020Electrical 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.
• 10171927Feb 19, 2020Body and structure. This bulletin provides a repair procedure to address a small number of customer concerns of the hood panel surface vibrating while driving. This condition can result if the mastic (adhesive) used to bond the inner hood reinforcing panel to the outer panel (skin) begins to separate.
• 10171924Feb 12, 2020Equipment, Electrical system. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure.
• 10171867Feb 4, 2020Engine cooling. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019 model year Ascent, Forester, and Crosstrek Hybrid vehicles in which the Positive Crankcase Ventilation (PCV) valve may be defective.
• 10171104Jan 31, 2020Equipment, Engine cooling. This Service Information Bulletin announces part number change information for the Positive Crankcase Ventilation (PCV) valves used on the models listed above.
• 10171099Jan 30, 2020Engine cooling. This bulletin announces availability of a new vacuum hose assembly for the positive crankcase ventilation (PCV) system incorporating improved sealing to prevent potential oil seepage.
• 10171096Jan 28, 2020Equipment, Electrical system. This bulletin provides information on a new reprogramming procedure (FOTA) to optimize the Harman Gen 3.1 Audio and Navigation head units (H/U).
• 10171095Jan 28, 2020Electrical system, Equipment. The first TomTom map update for Gen 3.1 Harman navigation equipped vehicles was made available.
• 10171089Jan 17, 2020Equipment, Air bags, Electrical system. This Bulletin provides information regarding Event Data Recorder (EDR) functionality which has been incorporated into the airbag system.
• 10171078Jan 8, 2020Suspension, Equipment. This bulletin provides an inspection procedure to follow when addressing customer concerns of a rattling, knocking or klunk type sound when going over slight bumps and/or uneven road surfaces.
• 10169851Dec 30, 2019Equipment. Reprograming file availability for optimization of Harman Gen 3.1 Audio and Navigation Head Units.
• 10169848Dec 20, 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.
• 10169831Dec 17, 2019Engine cooling. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019 model year Ascent, Forester, and Crosstrek Hybrid vehicles in which the Positive Crankcase Ventilation (PCV) valve may be defective.
• 10169877Dec 13, 2019Engine, Electrical 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…
• 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…
• 10169873Dec 10, 2019Suspension. "This bulletin addresses isolated concerns of a squeaking / creaking -type sound from the rear suspension. The condition is caused by a burr on the end of the coil spring winding produced with an end gap which was out of specification. This allowed the burr to make contact with the mount. Over time, the burr, which is characteristic result of the manufacturing process, can penetrate the rubber isolator and come…
• 10169872Dec 10, 2019Engine cooling. WUU-06 ECM Reprogramming for DTC C1424 Customer Satisfaction Service Program.
• 10169856Dec 5, 2019Transmission and drivetrain. Subaru of America, Inc. (Subaru) is recalling certain 2019 model year Ascent vehicles in which midjoint of the transmission hydraulic sensor harness was made with dissimilar materials (tinplate and copper) which may cause an oxide film to form. If an oxide film forms, the electrical resistance may increase, potentially causing an incorrect measurement of the hydraulic pressure.
• 10169830Dec 4, 2019Engine cooling. New stop sale/safety recall: WUW-08 Ascent, Forester, and Crosstrek Hybrid PCV valve Recall. The Positive Crankcase Ventilation (PCV) valve may be defective.
• 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.
• 10169824Dec 2, 2019Latches, locks and linkages, Electrical system. This bulletin announces availability of reprogramming files to optimize the Body Integrated Unit (BIU) operation of the automatic door lock (auto-lock / unlock) feature. Currently, when the vehicle is locked by the auto-lock feature, if any door other than the driver’s door is unlocked manually before the driver’s door is unlocked, the auto-unlock operation is cancelled. The new logic keeps the auto-unlock…
• 10168634Nov 21, 2019Electrical system, Transmission and drivetrain, Equipment. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019 model year Ascent vehicles in which the Continually Variable Transmission (CVT) chain may slip.
• 10168637Nov 18, 2019Equipment, Electrical system. "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, 2019Electrical system, Equipment. 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, 2019Electrical system, Equipment. 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, 2019Electrical system, Equipment. 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, 2019Electrical system, Equipment. 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, 2019Equipment, Electrical system. 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, 2019Electrical system, Equipment. 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.

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