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Service bulletins for the 2019 Subaru Ascent

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

638 on file from NHTSA, as of 2026-10-19.

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Bulletins, newest first
11-195-202020-02-05. Service bulletin. ENGINE AND ENGINE 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.
15-256-19R2020-02-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides information on a new reprogramming procedure (FOTA) to optimize the Harman Gen 3.1 Audio and Navigation head units (H/U).
15-255-19R2020-02-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. The first TomTom map update for Gen 3.1 Harman navigation equipped vehicles was made available.
17-17-13R2020-02-05. Service bulletin. AIR BAGS; EQUIPMENT; ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY. This Bulletin provides information regarding Event Data Recorder (EDR) functionality which has been incorporated into the airbag system.
05-71-19R2020-02-05. Service bulletin. SUSPENSION; 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.
WUU-06R2020-01-07. Service bulletin. ENGINE; 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 accelerator position which can result in the disabling of the VDC function. When the VDC function is disabled, EyeSight, Reverse Automatic Braking (RAB), and Electronic Parking Brake (EPB) auto release functions are disabled by the VDC fail signal causing the VDC, EyeSight, RAB and EPB warning lamps to illuminate. This program affects approximately 115,729 vehicles.
05-72-192020-01-07. Service bulletin. SUSPENSION. "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 into direct contact with the strut mount as shown in the photos below. This contact creates the sound described. Should this occur, both the mount and coil spring must be replaced. NEVER attempt to grind or otherwise alter the burr on the new or original equipment coil spring or repair any contact marks with paint or other coatings. Replace the affected parts with new ones."
Subarunet Announ2020-01-07. Service bulletin. ENGINE AND ENGINE COOLING. WUU-06 ECM Reprogramming for DTC C1424 Customer Satisfaction Service Program.
WUU-062020-01-07. Service bulletin. 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 accelerator position which can result in the disabling of the VDC function. When the VDC function is disabled, EyeSight, Reverse Automatic Braking (RAB), and Electronic Parking Brake (EPB) auto release functions are disabled by the VDC fail signal causing the VDC, EyeSight, RAB and EPB warning lamps to illuminate. This program affects approximately 115,729 vehicles."
WUV-072020-01-07. Service bulletin. POWER TRAIN. 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. If the fluid pressure is measured higher than its actual value, the Transmission Control Unit (TCU) programming was not robust enough to compensate for variation and would instruct the valve to lower the hydraulic pressure, thus potentially reducing the tension on the drive chain. Customers may experience irregular noise and/or vibration while driving, and/or warning lamp illumination. A total of 76,842 U.S. vehicles will be affected by this recall.
15-236-18R2020-01-07. Service bulletin. EQUIPMENT. Reprograming file availability for optimization of Harman Gen 3.1 Audio and Navigation Head Units.
15-234-18R2020-01-07. Service bulletin. 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.
WUW-08R2020-01-07. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV). 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.
Subarunet Announ2020-01-07. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV). New stop sale/safety recall: WUW-08 Ascent, Forester, and Crosstrek Hybrid PCV valve Recall. The Positive Crankcase Ventilation (PCV) valve may be defective.
02-184-192020-01-07. Service bulletin. ENGINE AND ENGINE 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.
07-162-192020-01-07. Service bulletin. LATCHES/LOCKS/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 operation from being cancelled regardless of which door is opened first.
15-251-19R2019-12-03. Service bulletin. ELECTRICAL 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 Retailer and the Technician finds the only code stored to be B2A16 in the DCM. • The Technician diagnoses the DTC per the applicable Service Manual trouble tree and replaced the DCM."
Subarunet Announ2019-12-03. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ELECTRICAL SYSTEM; POWER TRAIN. 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.
15-233-18R2019-12-03. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM; EQUIPMENT. 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.
15-220-18R2019-12-03. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 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.
15-231-18R2019-12-03. Service bulletin. EQUIPMENT; 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 customer concern. Answer each related question noting the results to each in detail while performing the diagnostics. Review the entire bulletin before beginning to understand the flow for the listed concerns.
15-230-18R2019-12-03. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ELECTRICAL SYSTEM. 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 the customer concern. Answer each related question noting the results to each in detail while performing the diagnostics. Review the entire bulletin before beginning in order to understand the flow for the listed concern. Please apply the information captured in the checklist to the Harman Investigation Guide Questionnaire. If the concern you have is not listed, check the Service Manual “Infotainment (Diagnostics) - Diagnostics with Phenomena” section as a starting point.
15-228-18R2019-12-03. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. 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, follow the question flow based on the customer concern. Answer each related question noting the results to each in detail while performing the diagnostics. Review the entire bulletin before beginning in order to understand the flow for the listed concern. If the concern you have is not listed, check the Service Manual “Infotainment (Diagnostics) > Diagnostics with Phenomena” section as a starting point.
15-247-19R2019-12-03. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY. 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).
15-227-18R2019-12-03. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; 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 on the customer concern.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.