2019 Subaru Ascent electrical problems

Filed Aug 6, 2026 · Driver assistance, Electrical · NY

All the safety systems become disabled and check Engine light goes on because transmission fluid is being pumped Out of a faulty secondary pressure sensor part 31878aa020,( defective and replaced with 31878aa021), into the engines wiring at the car computer, transmission computer, and bulkhead connector in fuse box causing all sorts of engine codes. The setting of the engine code closes all the vehicles driver safety systems and changes the dynamic of the drivers driving experience. As the problem gets worse, it can render the car powerless on roads and highways making operation dangerous. I have my car parked in front of the house with the battery and electrical connectors unplugged. This problem is covered by one or more recalls and safety campaigns, but subaru refuses to fix mine and other peoples that I found on Facebook. Someone online listed a $6500.00 repair estimate. They just had it repossessed instead. This part causes the pressure differences that cause the jerky ride and is specifically alluded to in the recall, plus subaru even changed the part because it was defective.

Filed Aug 1, 2026 · Driver assistance, Electrical · TX

the federal safety agency Vehicle Safety Complaint Vehicle: 2019 Subaru Ascent VIN: [XXX] Mileage: 72,093 miles I am submitting this complaint because my 2019 Subaru Ascent experienced a serious transmission-related electrical failure that may represent a broader safety defect. Sewell Subaru of Dallas diagnosed an internal failure of a transmission pressure sensor. According to the dealership’s written report, the failed pressure sensor allowed transmission fluid to leak into the electrical wiring harness. The transmission fluid then migrated through the wiring and into the bulkhead harness. The dealership advised that the fluid contamination had affected multiple parts of the vehicle’s electrical system and recommended replacement of the transmission wiring harness, engine wiring harness, bulkhead harness, Engine Control Module (ECM), Transmission Control Module (TCM), and related components. Because the wiring harnesses are routed throughout the engine compartment and vehicle, the repair also requires extensive disassembly of the vehicle, including disconnecting and removing numerous engine compartment components to access and replace the contaminated harnesses. The estimated repair cost was approximately $12,000. I also have video documentation of the dealership technician performing the inspection and explaining the transmission fluid contamination and migration through the wiring system. I am willing to provide the video, the dealership's written diagnosis, repair estimate, photographs, and any additional supporting documentation upon request. My vehicle falls within the published VIN range associated with Subaru recall WUV-07, which involved the CVT hydraulic pressure sensor harness and transmission hydraulic pressure system. That recall was later superseded by WRK-21. I understand that the published recall addresses electrical resistance and transmission hydraulic pressure readings rather than transmission fluid leakage. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 16, 2025 · Electrical · CA

The battery is draining so quick that the car doesnt start at all. The battery drained completely in 3 days and it’s happening more often.

Filed Jan 27, 2025 · Electrical · KY · fire

I have a 2019 Subaru Ascent Limited model with 96,xxx miles as of January 2025. In 2023, there was a safety recall for the PTC heater ground bolt sent first class mail for multiple year Ascent models. This recall was completed by local subaru dealership on 3/27/2023 stating "WRL 22 completed. Removed ground bolts and cleaned threads. Found no signs of heat damage. Removed and replaced bolts." Move forward to Saturday, [XXX]. I remote started vehicle from inside the house while on vacation in Bristol Tennesee. Car was running for roughly 5 minutes, when fire alarms inside the house starting going off. Seemed odd considering nothing was going on inside. Walked inside to see large amounts of white smoke coming from the windows of the Ascent. I was able to jump into the car and turn the engine off. I opened all 4 doors to let the car air out. I checked the engine, nothing seemed off. I then turned my attention to the air cabin filter, everything seemed normal as well. After the engine cooled and aired out, there is smoke damage to the vehicle. I was able to transport the car safely to Wallace Subaru which was less than 0.25 mile from our airbnb. I was quickly notified by the service technician that the car is not safe to drive until it was fixed. After further investigation, it was found that the PTC ground bolt has failed again, and this time melting the wiring harness and bolt around it. This was right next to the carpet and put my life as well as my wife, who is [XXX] and my [XXX] daughter. Thankfully we weren't in the vehicle when this occurred. There was no warning. No check engine light, nothing. No other issues leading into the incident. Car is still parked in Bristol TN at the dealership and I am 5 hours away in Lexington KY. Subaru has been uncooperative with this situation and is avoiding talking to me or making this situation better. I literally have no answers. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jan 17, 2025 · Brakes, Driver assistance · WV

Started the vehicle to drive 30 miles for an appointment. While driving, all of the intrument cluster lights illuminated. The eye sight turned off, cruise control no longer worked, parking brake light was illuminated, ABS light was illuminated. Tpms light was illuminated. This has occured 2 times before. The fix for the previous issues was to clean the battery terminals.

Filed Dec 10, 2024 · Electrical · WA

We have had to replace battery twice and had to have auto club give us a jump start multiple times. We drive this vehicle once or twice a month, but something is causing battery to run down way to fast. Manufacturer claims we need to drive more often. I have always had one car, that burned to much fuel, and was used as an occasional vehicle, but never had this type of problem. Something needs to be provided so that battery does not leak power when it is a low use car. I don’t want the internal lights to turn on when I walk by, or for it to access the internet. I believe that this leaves us vulnerable to non-availability at a critical time. We are planning a multi-week trip and have no idea if car will start when we return. Nor is their a way to disconnect unneeded activity that is draining battery.

Filed Apr 17, 2024 · Electrical, Engine · WV · fire

Over the course of 5 years, a lot has been mechanically wrong with our vehicle. Each service appointment yielded a 'cannot duplicate' response. Recently, my car has been in the service department a few times. My car had recall work performed on a ground bolt, and my husband advised them that the car had a 'rich fuel' smell when starting with the hood open. I've complained since 2021 of a smell when pulling up the mountain. The smell is what I described as a perm solution smell. Each time, the response was 'cannot duplicate.' In February, I took the car in to have the exhaust inspected because it was getting louder each passing day. I was advised that the entire exhaust needed to be replaced, and I would be responsible for costs. I brought my car home, unrepaired, and called Subaru of America to file a claim through them. I had repeatedly expressed concerns, and nothing was done, yet I'm expected to foot the bill now. Since February 12th, I have been back and forth with Subaru and just made the appointment to get the exhaust work completed, with a small contribution from Subaru. However, this past Saturday, [XXX] my vehicle caught on fire while driving. I am fine, but my vehicle has now been deemed a total loss. As I was descending the mountain, I smelled the same 'perm solution' smell, and shortly after, there was smoke coming from under the hood. The smoke entered the cabin as I pulled off the road. Upon exiting the vehicle, flames and smoke were visible from the hood. I grabbed my purse and ran, called 911, and watched my vehicle engulfed in flames. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Dec 26, 2023 · Electrical · TX

Car battery died in store parking lot. Low mileage (24,000). I do lots of short trips and this is a reported problem for 2019 Subaru Ascents. I had to wait 2 hours for someone to bring a charger to drive to auto parts store fire replacement battery.

Filed Dec 16, 2023 · Electrical · TX

Battery keeps dying.

Filed Aug 10, 2023 · Electrical · WI

Rear lift gate drains battery to the point where the vehicle won't start. The tailgate will beep three times, but will not open. Within 24 hours, the battery is insufficient to start it. You have to do a manual override to open the lift gate. The battery, starter and alternator were all tested and had no issues. I have to keep a jump pack in the car as the issue has become more frequent. The local Subaru dealership in Mequon, WI said they would replace the battery, but won't replace the module identified in a technical service bulletin for no charge: This seems to be a very common problem with the MY19 Ascents.