general problems of the 2018 Subaru Forester - part 1

The defect presents itself when the equipped data communications module (dcm) attempts to communicate with 3g cellular networks. As 3g networks within the u. S. Are no longer functioning, the call will continuously fail even after the vehicle has been turned off, draining the battery and resulting in a no-start safety risk for drivers. [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Airbag light comes on due to some failure in the passenger seat. This vehicle year has had a recall on the same issue but this VIN number was not included for some reason. Another consumer posted his assessment which I have attached. My vehicle falls under his category. He has sold his since his was never resolved.

Yesterday 6/19/25 I was driving out the driveway when the vehicle accelerated on its own, and not slowly, but like it had been punched. I was actually coasting at the time since I didn't want to stir up dust. My foot was not on the gas pedal. And it was not the floor mat. It happened on its own, the first time in 87,000 miles. It probably cannot easily be replicated as it was completely random, although now that it's happened once, it very well could happen again if there's a faulty or aging part or sensor. Neither the local dealer nor Subaru has acknowledged the problem (I called both today) but it's a serious safety issue. No check engine light or other means of warning. It just happened out of nowhere. Glad I was in the driveway and not in town waiting while a pedestrian was crossing the street.

The defect presents itself when the equipped data communications module (dcm) attempts to communicate with 3g cellular networks. As 3g networks within the u. S. Are no longer functioning, the call will continuously fail even after the vehicle has been turned off, draining the battery and resulting in a no-start safety risk for drivers but in order to replace the dcm to the 4g it will cost upwards of $2000.

I’ve experienced recurrent failures with my Subaru’s ac system, and it’s become more than just an inconvenience—it’s a real safety concern. In hot weather, the cabin can become unbearably warm, making it difficult to concentrate and increasing the risk of fatigue or even heat-related illness, especially for passengers who are older, very young, or have medical conditions. What’s even more frustrating is the poor quality of the system and Subaru’s lack of communication about what appears to be a known defect. Despite numerous complaints from other owners and repeated service visits, there’s been no clear explanation or long-term fix offered. The situation is not only uncomfortable—it’s unsafe, and the lack of transparency and accountability from Subaru has been incredibly disappointing.

I bought the car certified used from a grand prix Subaru in hicksville, NY. They did not mention this issue. I’ve had the car for 2 years, drive it 1-2x a week, have it serviced regularly, etc. All of a sudden in the past week it’s needed a jump 2x, maybe a few days apart. My lights are on auto, always, & shut off when the car turns off after a few seconds. My interior lights are all set to off, after the first jump. Doors & cargo door are all closed well. Battery has been tested & they say it’s not bad & doesn’t need replacing. So what is draining the battery then? when the battery is dead, it’s completely dead. No turnover at all & the cargo door won’t open until it’s running & charged enough again. I’m shocked the cargo door can’t open without the battery!.

My 2018 Subaru Forester has a faulty passenger air bag sensor, which has been diagnosed by my local Subaru dealer, with a repair cost of $1,500+ for labor and parts. It has intermittently turned on and off again, but after getting a separate issue fixed by my dealer, they diagnosed this problem, and every time the car is turned on, the warning light is constantly displayed, and the passenger seat airbag light shows "off" even when someone is in the passenger seat. Upon research, this is a known and common issue with other Subaru Foresters with heated seats in the same model year (my Forester does have heated seats), but my VIN is not included in the Subaru recall for this specific repair. This greatly puts the passenger in my car at risk, as the sensor does not recognize that a person is in the seat while they are riding, and if we were to be in an accident, their airbag would not deploy. I am frustrated that this is a known, common safety issue that affects my model and year of car, but my VIN is not included on the recall list. I would expect that my car should also be included in the recall and fixed by the dealer at their expense as it is clearly documented many times on other 2018 Subaru Foresters.

Blind spot detection goes on an off. Safety is impacted by the system going on and off. Took care to Subaru dealership.

Starting up the car in the morning after a long day stuck in traffic (over 100 degree f weather), moved about 5 feet then the eyesight system stopped working, rear braking stopped, and power steering gave out - the car started and the engine ran normally. The car was abandoned as unsafe until diagnostics could be performed and a different car was used to get around . That evening the car started up fine, also the next morning to reproduce conditions. Tested the battery, which showed "good" (93% charge/40%healthy). I suspect that, in the morning the a/c, headlights, radio, backup lights, etc. . . Put a large draw on the electrical system resulting in a system wide shutdown of adaptive features - however loss of power steering is insane and can easily result in death if it happens while driving especially while making a turn if the driver is not prepared/strong enough to force it. The linking of non-critical system to help the driver to an essential system is just asking for trouble.

Starlink screen has failed - the screen will either only show the initial agreement screen and freeze or it will freeze with the back up camera activated. I can’t access bluetooth capabilities, camera function, etc.

I have had multiple instances where I am unable to remove the key from the ignition switch when the vehicle is in park. Subaru's technical bulletin 16-112-18r states this is caused by contamination of the park-range switch internal components. I'm concerned I will be unable to remove the key and will have to leave the vehicle unlocked with the key in the ignition. I am also concerned I'll be stranded somewhere the next time this happens. I found information online that states Subaru dealers are charging $500 to $800 to repair this issue, which should be a recall or extended warranty situation and not a cost to the vehicle owner.

My 2018 Subaru Forester should be included in a recall and Subaru is denying that this recall exists. My srs air bag light is on. The dealership wants to charge $1216. . Read more...

My srs airbag system has just started going on and off. What I read is there is recall for this. 2018 with heated seats caused by faulty wiring. Yet when I put in my VIN shows no recalls. Filed complaint with Subaru they stated basically go get it fixed and will notify you if there is a recall.

This is the third time my car has completely drained my battery. I have replaced the battery twice since I purchased it in 2018. I drove it less than 24 hrs ago and it’s completely dead off a 8 month old battery. Nothing was left on any of the times it has died.

Battery has drained drastically twice to the point of the car dying while just waiting for some takeout.

Purchased new , after 5 years battery died . . Ok time for a replacement, les schwab installed a new higher capacity battery. 3 weeks later dead battery, had it jumbled, les schwab replaced new battery. 4-5 weeks later dead battery. Made appointment with dealership (lithia Subaru) 3-17-2023 in reno nv. A hour + away. I waited a few hours for their service department to check out the charging/battery issues. Came back said nothing wrong, need to drive it more ! drove it a couple days ago , this morning dead battery again ! I’m almost 70 / disabled and live in a very rural mountainous area and need a dependable vehicle… especially in the snow. Help please!.

My car is a 2018 with only 28100 miles on it. I have now had to replace the battery three times. Subaru tells me I need to drive it every two days in order to keep it from discharging the battery. This is unacceptable. Clearly there is a parasitic drain. My issue is very common, and affects many late model Subarus. I have already been stranded several times by this issue.

We keep replacing batteries and they keep failing. We wonder if this is related to the class action lawsuit concerning the can bus system.

New battery that is only 14 months since installation (at Subaru dealer) and 5,000 miles on the car is flat. I did not use my car for about 1 1/2 weeks in the garage and it is totally flat. This is not normal and my friend with an outback has similar problems so I think my issue is not unique.

I purchased the car cpo June 2021 battery replaced December 2022 battery replaced January 2023 between these replacements, car was consistently dying/would not start, required frequent jumps. Left me stranded numerous times. Each time the car was serviced (at different dealer locations), no mention was made of known issues with batteries being drained. This issue was known by Subaru, as evidenced by class action suits filed and won. At this time, the car engine is dead and will not respond to a jump. This has cost me thousands in car rentals/ride shares.

Just had my battery replaced and it’s already dead.

Car battery died within 4 months of purchasing, had to purchase a replacement.

Environmental and safety issue. The ac system has failed three times now. Subaru dealer checked the system for leaks at in November 2021 (mileage about 22,000 miles) and could not locate any leak but added freon. Ac system stopped working again in August 2022 at 24,000 miles. Mechanic checked system, found a loose connector and tightened it, then recharged freon in system. After 4 days, system again is not cooling the car. Compressor and blower work but no cold air and return line from compressor is not cool. This problem is widespread across Subaru forrester models 2017 & 2018. Checking for leaks and adding freon costs $200. Most likely a repair of the system will cost at around $1,500 - 3,000. For a less than 4-year-old, very well-maintained, garaged and little driven car, components should not be failing. Having no working ac is a safety hazard to be in while driving in 100+ degree weather and also the windshield will fog over because moisture is not being taken out of the air now. Environmental issue due to loss of freon to atmosphere.

Twice now the battery has died without any obvious reason. We did not leave the lights on nor any other electrical devices known to us. We had to cal aaa who could not find an issue for the drained battery.

Multiple episodes of car not starting, most similar to dead battery scenario. These incidents have occurred after car was parked in my driveway for 24-48hours. However, aaa responded on three separate occasions and tested battery which always was “green” or “good” and alternator was also “fine, not a problem”. On fourth occasion, I went ahead and replaced battery as recent Subaru scheduled service at a Subaru dealer yielded “no problems” on electrical survey when I told them of these incidents. Now, one month after having purchased a completely new battery, my car again will not start and aaa says battery is “good” and alternator is also fine.

Repeatedly I have not been able to remove the key from the ignition. It appears as though the car is not sensing that the gear is in park. It has taken me up to 10 minutes of turning the ignition on and off and putting the car in reverse and forward to be able to remove the key from the ignition. This has been happening for 3 weeks now, on a daily basis.

The radio/touch screen unit has lost its contrast. In bright sunlight I can see an underlying circuit pattern on the screen that makes it hard or sometimes impossible to see the back up camera. Instead of seeing the image from the backup camera all I see are lines. I can no longer rely on the camera for safety support.

This is the latest time in a series of incidents where the SUV would not start due to a problem with the main battery. New batteries drain very quickly after a series of electrical problems. So far, we have noticed keyless entry fob says battery in the fob is low and stops connecting (but then connects if we remove the key from it without us holding it to the button that turns the car on and off), we replace this battery but continue to have the same issues, front passenger side window is not able to be rolled down or up from driver side, as the battery continues to drain, gas gauges stop correctly registering amount of gas in the car, different warning lights light up on control panel without any sense of rhyme or reason, and overhead lighting gets dim. For a few weeks, the SUV blames the problems on the battery in the key fob being low, even though it was replaced on December 15, 2021. When replacing the fob battery did not work, we learned it was the actual main SUV battery that had been drained. It is now March 19, 2022, and we are having the same issues despite having only a moderate amount of miles put on the SUV and only 3 months of time passing since we purchased and installed a brand new car battery. We will have to spend money on batteries again.

Battery continues to drain when car is parked/off causing a required jump start and then recharging of the battery. Dealer replaced battery one time in 2019 (with expense to owner) and recommended driving car every couple of days to ensure it does not draw down. This is not normal. Battery continues to drain down. Owner purchased aftermarket agm battery (may 2021) of higher voltage/capacity to attempt to reduce number of issues yet vehicle continues to exhibit parasitic drain and battery dies after 3-4 days (faster when it's cold). Dealer has looked at car two more times and claims this is normal and need to not leave car for multiple days without starting. There are multiple class action lawsuits claiming this issue so I am registering this VIN as an affected vehicle.

Battery, electrical system was doing funny things I noticed then a day or two later my wife and daughter got stranded at a gas station and I had to go jump the car to get them home in the middle of the night we called the dealership a few times and they said that all battery's die they just said to go buy a new battery no warning light nothing.

The contact owns a 2018 Subaru Forester. The contact stated that while attempting to start the vehicle, the vehicle failed to start-up. The vehicle was towed to the local dealer who diagnosed that rodents had eaten through the engine wiring harness. The contact was informed that the wiring harness was made of a soy-based material that was attractive to rodents. The vehicle was not yet repaired. The contact indicated that 2 weeks prior the windshield wiper fluid spray mechanism was inoperable due to a similar failure with rodents eating the soy-based tubing. The manufacturer was not yet notified. The VIN was not available. The failure mileage was 27,000.

There is a parasitic drain on the electrical system, including when the vehicle is turned off and nothing is left running. As a result the vehicle will not start. Ai replaced the battery and experienced the same problem with a month. This is most problematic when the vehicle has not been used for at least 2 days or it's very cold outside. It's happened at least 10 times in the last 2 years. The most recent incident was yesterday. When I called dealership they denied any electric so issues with the 2018 Forester and want to charge me $75:to check the electrical system even though there's a lawsuit in canada due to this same exact issue. Everytime this happens ai and my passenger s are put at a safety risk by stranding us because until help arrives.

The battery went dead on Jan 14th 2022. This isn't totally unexpected as this was the first time the battery needed replacing since the car was purchased new. However, after the battery was replaced the same day, three days later Jan 17th the battery was again dead. Since then, the battery has been replaced once more and again died on both March 27th and April 1st. The car is driven weekly at least and has no warning lights on. After the most recent incident it was researched more heavily and found that there is a potential class action lawsuit against Subaru for this exact problem. Though it hasn't been dangerous for us it could be potentially dangerous should the car decided to fully shut off in the middle of traffic.

I'm unsure why this 2018 Forester wasn't one of the many manufactured that year recalled for an intermittent passenger seat air bag sensor malfunction since the focus of that recall remains the problem with this particular Forester: it has heated seats and displays an intermittent on/off passenger seat air bag light while a passenger is seated in that seat. The malfunction has been occurring for the past several years, however, our attempts to document and diagnose it have occurred much more recently. We took it to a dealership on 5/9/23; despite keeping it overnight and making numerous attempts to duplicate the problem (at a cost to us of $142) they were unable to do so. However, on 6/27/23, as I drove my wife a distance of approximately 150 miles and she sat in the front passenger seat, the airbag light displayed “off” almost the entire trip. Also, she and our son traveled about 400 miles between 16-19 June; he drove, she sat “front right”. During that trip the sensor light showed intermittently on and off and my wife was able to take time and date stamped photos of the sensor light from her point of view in the passenger seat; both when it was on and when it was off. I reported "all of the above" to the dealership and received a reply referring me to the "apparent" minimum weight limit needed for a passenger to trigger the sensor (100 lbs; I've seen 75), together with the explanation that "electronics" could interfere with operation of that sensor. Although my wife at times weighs just under 100 lbs, that weight limit doesn't explain why the sensor light is intermittently on and off on the same trip. At the very least, since she's now always concerned about failure of the airbag to inflate in the event of an accident, a recall/replacement/addition to the previously issued recall applicable to the exact same malfunction should be required. Based on dealership response, it will take an order from you before any additional repairs/replacements are made.

I'm filing a complaint regarding a battery drain issue in the 2018 Forester limited. After sitting idle and not being started for 1. 5-2 weeks the battery is fully drained. Fully drained is defined as the car won't start with a portable jumper. The power source car needs to be running and connected to the battery of the dead Forester for upwards of 20mins to give it a partial charge prior to the battery dead Forester being able to start. I've been told various reasons from various dealers and cannot get a straight answer. [a] one Subaru dealersip said it's normal to have a dead battery in 3days. [b] another Subaru dealership said it was because I had a bad battery, but after replacing it the issue still persisted. I have made sure to manually shut off all lights including making sure the running lights are in the off position, not the automatic on/off position. This incident has occurred multiple times when traveling for week at a time and upon returning to the car to try and start it and it won't start. The same dealership [b] claimed that the parasitic draw was because I kept a cigarette lighter car charging adapter plugged in even though the car was off. I have read several other complaints about this issue regarding this car and hope there can be a recall/legal claim filed against Subaru for this issue so they resolve it.