Subaru Outback start-stop problems

Filed Oct 28, 2026 · Engine · MD

The auto start/stop function on my vehicle malfunctioned while I was in heavy traffic. The auto start/stop function shut off while stopped in beltway traffic but did not start again when it was time to begin moving again. The dashboard lights flashed and I attempted to turn the car off and restart it, but the vehicle would not start. This was a serious safety issue because I was stranded in a busy highway lane with cars passing at high speed on both sides, unable to safely exit the car or move the car out of the 4-5 lanes of traffic. Fortunately, a police vehicle was stopped behind me and he was able to put on his emergency lights and secure a safe exit from the vehicle and clear the lanes closest to the side of the highway. He assisted me to push the car to the side of the beltway. I called AAA and the technician charged the battery. The car did start but I had it towed to the Subaru dealership in case the same issue happened again. The dealership took a week to replicate the problem and eventually came to the conclusion that it was the battery. They did not mention that this issue has been documented in some Subaru models. A Google search advised me that this has been a recurring issue and advised that I submit this report to the federal safety agency. The dealership replaced the battery and the issue has not happened since, however I have mostly been turning the auto start/stop feature off manually for fear that the same thing might happen again. Unfortunately I did not learn about this issue until after the dealership had returned the car to me. I believe they only replaced the battery and no further manufacturer inspections were mentioned. The battery part is PB001993.

Filed Oct 26, 2026 · Electrical, Engine · FL

I purchased this 2024 Subaru Outback three months ago with 19,000 miles. It currently has 26,000 miles and is still under its factory powertrain warranty. On October 25, 2026, after completing a short trip, I was stopped at a red light on State Road 524 in Cocoa, Florida. When the light turned green, the vehicle began to accelerate forward, but the Auto Start-Stop system failed to successfully restart the engine, causing the vehicle to completely stall in the middle of active traffic. I shifted the vehicle into Park, depressed the brake, and pushed the ignition button to restart it. Instead of cranking, the vehicle experienced total electrical chaos—the dashboard, infotainment screen, and interior electronics began flashing erratically, and the engine refused to start. The vehicle had to be pushed out of the path of traffic by hand and subsequently towed to a Subaru dealership. The dealership confirmed that the Auto Start-Stop system had critically drained the battery below operating thresholds. There were absolutely no prior warning signs, dashboard battery lights, or slow engine cranks leading up to this event. The vehicle simply died without warning in live traffic. This creates a severe safety hazard; had this stall occurred while merging onto a highway like I-95 during stop-and-go traffic, it easily could have resulted in a high-speed rear-end collision. Because Subaru does not provide a permanent override switch for the Auto Start-Stop feature, drivers are forced into a recurring safety defect with no warning indicators that the system is about to fail and strand the vehicle.

Filed Aug 26, 2026 · Electrical · VA

Vehicle's Auto Start-Stop system shut the engine off while stopped at a red light in [XXX], in rainy conditions in late XXX at approximately 29,000 miles. When the brake was released after the light turned green, the engine did not restart, leaving it stopped in the travel lane in live traffic. The driver had to use a portable jump starter to get it running again. This was not isolated — repeated failure-to-start incidents in prior weeks had already prompted carrying a portable jump starter in the vehicle. At the time we believed this was a failing 12V battery. The original battery was replaced XXX with a new aftermarket AGM battery. Despite that replacement, the vehicle has continued to have multiple complete battery drain if left parked for multiple days (but less than a week), indicating the restart failures were likely caused by an underlying parasitic electrical draw rather than a simple worn-out battery. Subaru's own Technical Service Bulletin 07-199-21R, "Measurement of Dark Current (Standby Current Draw)," describes this exact failure pattern (batteries/vehicles going dead over time due to standby current traced to the VDC module and/or Power Rear Gate control module) for this model and model-year range. A pending federal class-action lawsuit, [XXX] v. Subaru of America, Inc., Case No. XXX (D.N.J., filed XXX), alleges an electrical-system defect preventing one or more control modules from entering a proper low-power sleep state, causing parasitic battery drain, and specifically names 2021-2022 Outback vehicles. We are concerned this defect can cause the Auto Start-Stop system to fail to restart the engine at a stop in live traffic, creating a real risk of being rear-ended or blocking an intersection, as happened in the incident described above. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 17, 2026 · Steering · OH · 1 injury

When engine auto-restarts after Auto Start-Stop has started engine, steering wheel jerks violently if it is not completely straight, dislocated my 5th finger.

Filed Jun 26, 2026 · Electrical, Engine · MD

On May 19th 2026 around noon time, while we (me and my wife passenger) were driving my 2022 Subaru Outback Touring (2.5L, non-turbo) in active congested traffic on our way to airport, the engine shut off as expected by the Auto Start-Stop system when I came to a stop. When I released the brake pedal to proceed, the engine failed to automatically restart. The vehicle became immobilized in a live traffic lane, creating a serious safety hazard with traffic backed up behind me and oncoming vehicles unable to predict my situation. No warning lights or alerts preceded the failure. After shifting to Park and pressing the ignition button multiple times, the engine eventually restarted. There was no prior history of stalling, no check engine light, and the battery and vehicle have been maintained per Subaru's schedule. This is a critical safety defect: a vehicle that disables its own engine in traffic and fails to restart on demand puts the driver, passengers, and surrounding traffic at immediate risk of rear-end collision. The Auto Start-Stop system should never leave a vehicle stranded in a live roadway. The vehicle is available for inspection. I have/have not yet taken the vehicle to a Subaru dealer for diagnosis.

Filed Jun 17, 2026 · Brakes, Electrical · WA

On June 15th 2026, I was at a red light and the Auto Start-Stop feature shut off the engine. When light turned green, my car lost power and started rolling downhill. During this rolling downhill, the brakes stopped working, I was unable to engage parking brake, and I wasn't able to do anything except find a place to safely use gravity to slow the vehicle down. If the hill was steeper, this scenario could have been deadly. It was so scary, I called 911 for assistance but got lucky I was able to stop the car before there was an accident. It turns out the battery didn't have enough power to allow the vehicle to restart and if this happens when the Auto Start-Stop feature is engage you lose the ability to use the brakes. I spoke to the local dealership and acknowledge that is a problem.

Filed Jun 5, 2026 · Electrical, Transmission · AZ

Recently, the 2022 Outback my mom drives has been having some strange electrical issues. About a year-or-so ago the battery in her outback died. Not unusual in Arizona. I replaced it with an upgraded AGM (Interstate) version—same group, same cranking power. No issues. Recently, after an oil change at the dealer, she called back to report that a “Check Engine” light had come on. She was told that she probably had not put the gas cap on properly. Gas cap was on properly; light went off the next day. A few days later the Auto Stop/Start (ASS) feature started acting up (not functioning). A few days later the ASS turned the engine off and did not restart automatically—in the middle of heavy traffic during rush hour. The ASS light came on. The engine started manually, and we got it home. Battery was dead the next morning. I charged it up and took the car to the local mechanic for a quick assessment. The battery was fine, charging, but the car threw a Code: P0871 Transmission Fluid Pressure Sensor Switch. This mechanic told us that there was a Technical Service bulletin through Subaru that addressed this issue but was also aware that it could be caused by the ASS killing the battery OR other electronic modules which fail to enter sleep mode—which would also cause random lights to come on. An appointment was made to take the car into Peoria Subaru, thinking it would be something they could diagnose easily. It had previously been in for the routine oil change with the inspection. When we dropped the car off, I provided the Advisor the code and a associated TSB for the code. We got the car back that day and were told the following: The tech found that the car currently has a “Aftermarket” AGM battery. Subarus require a “Enhanced Flooded Battery” which would explain multiple codes found for loss of communications and parasitic battery drain--for systems that don't go to "sleep" when the car is not running.

Filed Feb 19, 2026 · Driver assistance, Visibility · WA

1.) Eyesight constantly turns off on a whim. No reason or rhyme to it but just turns off. Meaning none of my "safety" systems (lane departure, crash avoidance, emergency braking, lane keeping assistance, collision warnings, collision braking) are functioning. Then it turns on when it decides it wants to turns back on after awhile but will happen in the middle of a 30+mile drive. When has this happened? Intermittently since I've purchased the car 11/23/2024. It's happened at least a dozen or more times. Dealership says nothing is wrong with car and they cannot replicate issue. This is just one of many issues with the new Subaru. Others are auto start stop does not function as it should per the User Manual. 12/4/2024 Passenger outside mirror does not defrost as stated it should in User Manual. 12/4/2024 Mileage for the Wilderness edition rarely hits minimum estimated MPG. constant

Filed Dec 3, 2025 · Electrical · CA

I experienced two serious electrical failures within a few days that caused the vehicle to stall without warning. At Nov 29, 2025, after parking for about 20 minutes, the car would not start. Symptoms included: • Very weak clicking from the starter • Dashboard flickering and dimming • Unable to shift out of Park without manual override • Jump-start did not work even though power was delivered The vehicle was towed to the Subaru dealer. The dealer reported: • Battery “low but fine after charging” • Alternator “normal” • Starter “normal” • No warning codes On Dec 2, 2025 the vehicle had been released without repairs. Only a few minutes after leaving the dealer, the car stalled in live traffic during an Auto Stop/Start event. Symptoms: • Immediate loss of all electrical power • All warning lights flashing erratically • Hazard lights did NOT illuminate externally • Gear shifter locked again • Vehicle would not restart on battery • Subaru roadside assistance jump-started the vehicle With Auto Stop/Start disabled, it was barely drivable and returned to the dealer. This appears to be a serious electrical or charging-system failure, possibly involving: • intermittent alternator failure • voltage collapse during Auto Stop/Start • BCM or power distribution fault The vehicle can stall unpredictably in traffic without warning, creating a significant risk of collision.This is not normal battery discharge — the battery was fully charged at the dealer minutes before the second failure. I am filing this complaint because this issue is dangerous and the dealer cannot reproduce or diagnose it. A formal investigation or recall may be necessary.

Filed Nov 4, 2025 · PA

I was stopped at a stop sign and the car shut off as the auto on/off function. When I went to drive the car did not re-start as the battery needed replaced. I was left stranded in an intersection. The battery did need to be replaced. The auto start/stop feature is a saftey hazzard on any vehicle