2021 Subaru Outback electrical problems

Battery drains rapidly when vehicle is parked, often fully discharging within days even with all accessories off. Owners report needing jump-starts repeatedly, sometimes after only 1-3 days of parking. Multiple owners report the CAN bus failing to enter sleep mode when the vehicle is shut off, causing parasitic drain. Dealers test batteries and find them 'fine' despite the repeated failures. Replacement batteries also drain. One owner reports voltage as low as 5.80V after a few days of parking.

When: Occurs within days of parking; some owners report issues starting at 700 miles, others at 832 miles, 6000 miles, 11,000 miles, and up to 57,000 miles. Pattern spans the first year to multiple years of ownership.

Symptoms owners cite: Vehicle will not start after sitting 1-3 days; No warning lights or messages prior to failure; Requires repeated jump-starts; Battery tests 'fine' at dealer despite repeated failures; Clicking sound from starter motor at times; Dash lights blink erratically during failed start attempts; Instrument cluster goes blank intermittently

Codes mentioned: P2682 (Check Engine light related to Eyesight/electrical issue)

Repairs/costs cited: Dealer replaced battery at no cost under warranty for some owners; replacement batteries fail with same issue. One owner purchased trickle charger and keeps it on battery in garage at all times. Another bought portable jump starter for $150. One dealer mentioned parasitic drain as potential cause but indicated class action suit only covers 2015-2020 models, not 2021.

Recalls/TSBs owners mention: Class action lawsuits Daley v. Subaru and Tomasian v. Subaru cited by owners; however, current suit covers 2015-2020 only. Subaru has issued ECM updates in some cases. Limited battery warranty offered (not covered under 3-year vehicle warranty in some instances). No factory recall identified in narratives.

Center console touchscreen randomly goes blank or reboots without warning. Screen blackouts range from soft reboots (30 seconds, system returns) to hard reboots (several minutes, loses all functions including HVAC, navigation, EyeSight, cruise control, backup camera). Hard reboots while driving at highway speeds trigger sudden vehicle deceleration. Owners report excessive lag (1-45 seconds) when navigating menus, causing distraction. Volume randomly spikes to 100% on some vehicles. Some units fail to load or freeze repeatedly. Reboot issues often triggered by USB connection or occur randomly.

When: Onset reported between first few months to several years of ownership. Issues documented at 22,500 miles, 1,800 miles, 8,500 miles, 4,488 miles, and 11,000 miles. Intermittent nature makes timing unpredictable.

Symptoms owners cite: Center console screen goes black without warning; System reboots while driving; Cruise control deactivates during hard reboot at highway speed (65-75 mph); EyeSight system disabled during reboot; HVAC and navigation functions lost; Backup camera fails to display; Audio volume spikes to 100%; Excessive menu response lag (1-45 seconds); Screen freezes and beeps repeatedly; Reboots triggered by USB device connection or unpredictable; Lane assist disabled during reboot

Codes mentioned: Error codes captured by dealer and sent to Subaru of America (specific codes not listed in narratives)

Repairs/costs cited: Dealer installed software monitor to capture failure data. One dealer replaced center module but failure persisted. Software updates issued approximately every 6 months with no permanent fix achieved. One dealership suggested pushing defrost button 5 times to record codes—a distraction while driving. Subaru advised dealer to have owner do this while vehicle is in motion, which triggers driver monitor safety alerts.

Recalls/TSBs owners mention: Subaru of America notified via certified letter in at least one case; response slow or nonexistent. Multiple owners report dealer acknowledgment of defect but statement that 'no remedy exists.' Service managers at two dealerships reported it as a 'common problem' with a 'patch' intended to fix it; patch failed in real-world use. No recall or field service bulletin identified in narratives. System falls under 3-year/36,000-mile warranty.

Vehicle suddenly accelerates without driver input or fails to respond to brake application during low-speed maneuvers (parking, intersection approach) or at highway speed. In two cases, vehicle accelerated while driver was applying brakes. One incident involved engine surge during reverse (backing out of parking space). Owners report it felt as though accelerator became stuck or brake pedal lost responsiveness. No warning lights or EyeSight/adaptive cruise alerts present.

When: Incidents documented at low speeds (parking, intersections) and highway speeds. No mileage pattern identified.

Symptoms owners cite: Vehicle accelerates suddenly without pedal input; Vehicle continues accelerating despite brake application; Engine surges during reverse maneuver; Brake pedal felt as though it 'dropped' under foot in one case; No warning lights or messages at time of incident; Adaptive cruise control and EyeSight not engaged

Repairs/costs cited: One owner had brakes inspected post-incident; brakes were functioning normally. Vehicle not inspected by manufacturer in any of the reported cases.

Recalls/TSBs owners mention: No manufacturer response documented. One owner researched online and found mention of an 'ongoing lawsuit' regarding this issue.

Engine stop-start feature (auto stop-start) engages unexpectedly or fails to restart engine when it should. In one case, feature engaged during turn in intersection; in another, feature failed to restart engine during highway stop-and-go traffic, leaving vehicle immobilized on freeway. Engine cranks but fails to turn over after stop-start shutdown.

When: Issues documented at various speeds and traffic conditions, including highway and intersection scenarios.

Symptoms owners cite: Stop-start feature engages at inappropriate times (mid-turn, etc.); Engine fails to restart after stop-start shutdown; Engine cranks but does not turn over; Console lights flash on and off continuously during restart failure; Vehicle becomes immobilized on freeway with hazard light malfunction

Repairs/costs cited: One owner noted salesman disabled feature before test drive; owner had to 'get used to' feature per salesman. Another owner disabled feature themselves due to safety concerns.

Recalls/TSBs owners mention: No manufacturer response documented.

Keyless start button fails to function even when key fob is present and brand new battery installed. In one case, having cell phone in same pocket as fob causes start system to fail; separating phone and fob does not restore function until vehicle is turned off and restarted. Lock/unlock function of fobs works 'stubbornly, randomly & repeatedly' does not work.

When: Issues span multiple years; one reported at recent cold weather conditions.

Symptoms owners cite: Start button does not engage when pressing fob; Ignition turns on but vehicle does not start; Dashboard instruments light up but engine does not crank; Phone/fob proximity creates logic fault preventing start; Lock/unlock function works intermittently

Repairs/costs cited: One owner resorted to using MySubaru app with Starlink subscription to remote-start vehicle; cannot shift into gear with remote start, must manually restart vehicle via button press. Fob battery replacement did not resolve issue.

Recalls/TSBs owners mention: No manufacturer response documented.

Pre-collision braking and forward collision warning systems are overly sensitive and activate when not needed, causing vehicle to lurch or brake abruptly during lane changes or highway merging. Blind spot warning and forward collision warning fail to operate. EyeSight system shuts down intermittently during infotainment reboot events, disabling adaptive cruise control and emergency braking.

When: Onset varies; reported at highway speeds and during normal driving.

Symptoms owners cite: Pre-collision braking over-reacts during lane changes; System activates when switching lanes on highway; System activates when vehicle merges into lane in front of owner; Blind spot warning does not work; Forward collision warning does not work; System defaults to 'always on' making it hard to disable; EyeSight unavailable message appears during screen reboot

Repairs/costs cited: Owner states system is 'defaulted to always being on' and 'is a chore' to turn off. Owners disable system due to safety concerns over false activation.

Recalls/TSBs owners mention: No manufacturer response documented.

Engine block caught fire while vehicle was parked and turned off. Fire melted engine and hood, totaling vehicle. Fire was confined to engine block and front end. No warning prior to incident. Vehicle was 16 months old with scheduled maintenance completed three times.

When: At 16 months of ownership.

Symptoms owners cite: Engine block fire while parked and off; No warning lights or messages prior to fire; Fire contained to engine block and front end

Repairs/costs cited: Vehicle totaled. Nearby tree was damaged by fire.

Recalls/TSBs owners mention: Insurance company and firefighters confirmed fire was not arson. Vehicle origin of fire unknown; owner unaware if manufacturer inspection completed.

Heating system (driver-side vents) emits uncontrollable hot air even with seat and steering heat on. Vents cannot be controlled by driver, forcing shutdown of driver-side heating system during winter. Concern raised that exposed electrical wires could cause fire.

When: During winter months.

Symptoms owners cite: Driver-side vents emit uncontrollable hot air; Cannot control vent temperature independently; Issue forces shutdown of heating system; Problem attributed to design defect per dealership

Repairs/costs cited: Dealer indicated issue is inherent with design and unable to resolve.

Recalls/TSBs owners mention: No recall or TSB identified; dealership indicated issue is design-inherent.

Brakes wear prematurely, requiring replacement around 31,000 miles. Owner performed recommended tire rotations and maintenance. Dealership confirms brake wear not typical.

When: At 31,169 miles.

Symptoms owners cite: Premature brake wear requiring full replacement; Wear not typical for driving style or owner's past Subaru experience

Repairs/costs cited: Not covered under warranty. Owner suspects possible link to Electronic Brake Distribution (EBD) system.

Recalls/TSBs owners mention: No manufacturer response or recall identified.

Tires wear excessively on inside, requiring replacement at 31,169 miles despite recommended rotations and alignment service. Alignment check showed rear right camber at -2.0, exceeding Subaru spec of -1.8 to 0.3. Rear camber is not adjustable on 2021 model.

When: At 31,169 miles.

Symptoms owners cite: Excessive inside wear on tires; Camber out of spec on non-adjustable suspension; Tire wear not typical despite routine maintenance

Repairs/costs cited: Owner purchased tires from third-party shop. Dealer acknowledged spec issue but declined warranty repair or to discuss adjustable cam bolt kits.

Recalls/TSBs owners mention: No manufacturer response documented; dealer declined to address under warranty.

All five tires (including spare) unable to maintain pressure despite being filled with nitrogen as part of Subaru's tire innovation program. Pressure loss persists across multiple service visits.

When: Ongoing throughout ownership.

Symptoms owners cite: All five tires lose pressure over time; Cannot maintain pressures in various weather conditions; Issue reported at each service visit

Repairs/costs cited: Owner cites possible causes: inadequate seal between tire and rim, slow leakage in tire valves, or poor tire quality.

Recalls/TSBs owners mention: Dealership acknowledged issue at each service but unable to resolve; no remedy offered.

Headlights (and possibly fog lights) are excessively bright, causing oncoming drivers to flash headlights repeatedly. Fog light beam control is poor, lighting tree tops at distance on country roads.

When: Ongoing during nighttime driving.

Symptoms owners cite: Headlights excessively bright compared to other vehicles; Oncoming drivers flash lights consistently; Fog lights have poor beam control; Fog lights illuminate tree tops at distance

Repairs/costs cited: No repair attempted. Subaru customer service suggested not using fog lights; no offer to address brightness.

Recalls/TSBs owners mention: Subaru customer service representative 'laughed' at complaint and suggested not using fog lights. No professional response or remedy offered.

When vehicle became immobilized on freeway due to stop-start failure, hazard lights did not illuminate even though dashboard indicator showed them as 'on.' This created hidden danger as following vehicles could not see immobilized car.

When: During stop-start system failure event on freeway.

Symptoms owners cite: Hazard light button activated and shows as 'on' on dashboard; Exterior hazard lights do not illuminate; Immobilized vehicle on busy freeway not visible to following traffic

Repairs/costs cited: Issue resolved when vehicle was recovered/restarted.

Recalls/TSBs owners mention: No manufacturer response documented.

Low windshield washer fluid alert triggers multiple audible alerts while driving. Alert appears to be sensitive to fluid level movement (slosh) during driving, causing alert to disappear and reappear repeatedly.

When: Intermittent, tied to driving and fluid movement.

Symptoms owners cite: Multiple audible alerts for low washer fluid while driving; Alert goes away and returns repeatedly; Alert triggers alarm fatigue

Repairs/costs cited: No repair documented.

Recalls/TSBs owners mention: No manufacturer response documented.

Vehicle lost all power while driving on freeway at 70 mph during stop-and-go traffic. Check engine light, emergency brake warning, and lurching engine all illuminated simultaneously. Vehicle coasted to exit in extreme danger on busy freeway.

When: At 56,000 miles, 2 years of ownership.

Symptoms owners cite: Complete power loss at highway speed; Check engine light illuminated; Emergency brake warning illuminated; Engine lurching; All console lights flashing at once; Sudden deceleration from 70 mph

Repairs/costs cited: Service center installed new thermostat, intake manifold gasket, fuel pipe, and EGR pipe gasket. Service center reported this is the 10th instance in one year for their shop. Three windshields replaced in last 6 months.

Recalls/TSBs owners mention: Subaru dealership service center inspected vehicle; nature of manufacturer response unknown.

Electronic door locks failed after vehicle was repaired for hail damage at body shop. Vehicle was at body shop April 20 - mid July 2022. When vehicle was picked up, door locks did not work.

When: After collision repair work completed in July 2022.

Symptoms owners cite: Electronic door locks do not function; Issue appeared after body shop work

Repairs/costs cited: Diagnosed as faulty body control module by North Park Subaru. Warranty denied due to 'outsider influence' (body shop repair). Vehicle held from August 8 for diagnosis.

Recalls/TSBs owners mention: Warranty claim denied; manufacturer would not honor repair.