2017 Subaru Outback: sudden loss of power

Filed Jun 22, 2026 · Brakes, Engine · CO

On Monday [XXX] were driving on [XXX] going north up [XXX]. I was doing about 60-65 mph in traffic which was flowing in both directions. While ascending the pass, the car suddenly started to misfire, rapidly lost power, power steering failed and all dash lights lit up. With no shoulder to pull out this was a very scary experience. Eventually managed to limp to a spot where I could pull out off the pavement. Car was dead. Popping the hood showed significant battery corrosion. I had a toolkit with me. The voltmeter measured the battery voltage at 9.3V. Thinking maybe cleaning the battery terminals would allow the car to be restarted, I managed to get the cables off and cleaned everything with a wire brush. But still no power. After a while a state trooper passed by and hung on while I contacted a towing service. After another 1.5 hours, the tow truck arrived and towed the car the 60 miles or so to the dealership in Denver with my wife and I in the cab of the tow truck. Dealer repair invoice indicated Data Control Module (DCM) "causing excessive draw on electrical system." More significantly, the battery had drained below the the operating threshold voltage required for vehicle drivability (understood to be 10-10.5V). There was no mention of this by the dealer service adviser. Although dealer diagnostic was carried out, no computer codes were provided. Vehicle mileage at time of incident 73,456. I have owned the car since new and have all service records. Car was repaired and picked up from dealership on 06/10/26 with a replacement DCM. Battery was charged up but not replaced and left in corroded state. Battery will probably have been weakened by such a total discharge with reduced life expectancy. I have uploaded the dealer repair invoice. I have reported this incident to Subaru of America. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 2, 2023 · Engine, Transmission · CA

Vehicle lost engine power twice while on the road between 8/12/23 and ~9/25/23. Took to Subaru Santa Monica service on 9/26, left it overnight, and was unable to replicate the problem. I cleaned the K&N drop in filter after 8/12 incident since I haven't cleaned it in a while. Subaru Santa Monica service said that there's oil contamination from the filter into throttle body and I need cleaning and new air box. I don't think that's the problem and this is a major safety issue. Although I have a 7 year warranty that's still active, I paid $219 for diagnostic. Not covered under warranty because can't replicate issue. My plan is to sell this car as it's a personal and public safety danger. Don't have time to keep going to the dealer and paying out of pocket.

Filed Oct 12, 2022 · Electrical · UT

While driving, advance driver assist systems became disabled, car intermittently stopped and resumed responding to accelerator, power steering became inoperative, car eventually lost all power. Gear would not shift out of drive. Emergency brake would not engage. Fortunately, I was able to coast the car to the shoulder of the road. Had to keep foot on brake until roadside assistance arrived. Car was towed to repair shop where battery was replaced. Similar system failures occurred while my wife was driving a couple of weeks prior. She was able to coast car into a parking lot just off the road. In the past month, the dealer has replaced parts that diagnostics said created parasitic drain. The alternator has been replaced and the battery has been replaced twice in the last couple of months. Car had body work performed last week and the car will not start without being jumped. We are going to drive it to the dealer with fingers crossed that the electrical system will not shut the car down while in transit.

Filed May 24, 2021 · Electrical · OH

Battery losing power. Bought new battery in 5/2020, recharged in 1/2021 and again in 5/2021. AutoZone has stated it's a good battery, but is being drained by something. No lights have been or other known things left on after turned off car. The lights do not dim when driving either. I have read a lawsuit has been filed regarding it could be an electrical problem with the Subaru. I have been stranded 3 times with this problem.

Filed Jan 31, 2021 · IN

Sudden battery power loss multiple times

Filed Jan 29, 2020 · Fuel system · 43,600 miles · VA

Car lost power and engine shut down while at freeway speed with 1/8 tank apparent remaining on the gas gauge and 60 miles remaining on the miles to go indicator. Added 1 gallon at roadside and car started immediately. Added an additional 15.5 gallons at a station 12 miles from point the engine shut down. This leaves between 2 and 2.5 gallons of unused fuel in the tank at the point the car shut down from fuel starvation.

Filed May 18, 2019 · Engine, Transmission · 48,000 miles · MD

In two separate events the car lost power while accellorating at highway speeds to merge into traffic from a stand still. The gas pedal became unresponsive and the tranmission stopped shifting. In the first incident the engine stalled, and in the second it sputtered and almost died during a heavy merge on an on ramp. No diagnostic codes were thrown, so the manufacturer claims there is nothing wrong with the car. In the first incident the car was leaving the toll plaze on the dulles greenway head toward leesburg, va. Under full acelleration leaving the toll plaza and effectively driving straight, the car started shufting erratically, and eventually lost power and stalled. In the second incident, about two months later, the car was on a decline on-ramp merging into heavy traffic on rt-270n heading toward frederick, md. The car again started to shift erratically, then began to stall, but I was abke to use the paddle shifters to shift the 'gear' of the CVT and prevent stalling. Afger about 30 seconds the car was operating as normal. Again, the dealer has not found any diagnostic codes, and indicates there is nithing wrong with the vehicle.