Subaru Forester check engine light comes on

Filed Oct 28, 2026 · Engine · CO

Component Failed & Inspection Availability: The vehicle suffered a sudden, catastrophic mechanical engine block failure at 74,000 miles. The dealership teardown confirmed a failed/spun lifter bearing and a fractured connecting rod cap, requiring a complete engine replacement. This sudden oil pressure failure/blockage occurred while the engine oil pan was verified completely full. This sudden mechanical failure is directly consistent with severe localized thermal breakdown from a failing Thermo Control Valve (TCV)—a component subject to Subaru Warranty Extension WMM23—or loose factory RTV silicone debris clogging the oil galleries. The failed components, including the engine block, rod cap, and TCV, have been retained by the owner and are fully available for inspection upon request. Safety Risk: The engine failed catastrophically and seized instantaneously while driving at highway speeds, causing a sudden and total loss of motive power. This created an immediate hazard as the vehicle rapidly decelerated in active traffic without warning, blinding drivers behind me and stripping the vehicle of power steering assist. This forced a dangerous maneuver to navigate the disabled vehicle through highway traffic to the shoulder, significantly risking a severe rear-end collision. Dealer Confirmation & Inspection Status: The problem and point of failure were officially confirmed and documented via a physical engine teardown conducted by a certified Subaru dealership service center. Subaru of America Corporate Advocacy was notified under Case Number 260818-1500487 but denied coverage. The components have not been inspected by the police or insurance representatives, but they remain preserved as physical evidence. Warning Lamps & Symptoms: There were no warning lamps, check engine lights, low-oil indicators, or abnormal electronic codes prior to the instantaneous mechanical failure. The vehicle had been professionally serviced and oil-changed just 3,800 miles prior to the breakdo

Filed Oct 26, 2026 · Driver assistance, Engine · FL

On XXX, while driving my 2020 Subaru Forester Sport (VIN [XXX]) at approximately 35 mph on [XXX], the check engine light came on and EyeSight, adaptive cruise control, and pre-collision braking were disabled / other warning lights appeared / engine temperature issues. A diagnostic scan showed code [P2682 / P26A3 / P26A5], and the Thermo Control Valve (TCV) was found to be defective. Mileage at failure: 33,297. Subaru has acknowledged this defect in Technical Service Bulletin 09-119-24, which extends warranty coverage for the TCV on 2019–2021 Foresters to 15 years/150,000 miles. However, Subaru of America denied coverage and goodwill (case XXX) because the vehicle was originally sold in [XXX] through Subaru’s independent distributor, Trebol Motors, before I moved to [XXX] in XXX. This failure disables key safety systems without warning and should be addressed through a safety recall that covers all affected vehicles, including those sold in U.S. territories. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 2, 2026 · Brakes, Electrical · MS · 1 injury

Transmission slipped, stranded me in the middle of a road XXX. Stopped wouldn’t go. Started locking down in reverse 1 month after I purchased the vehicle. XXX, my husband was backing down a road that had no turnaround. The RAB locked down, slammed so hard, the car slid six feet and the motor shut down. I found out a week later that L-5 was fractured in my back. The lockdown has hurt my [XXX] mother’s neck also, in March of this year. The friction clutches is fried in my transmission. My transmission is jerking, slipping, clanking, shaking from multiple lockdowns. I took vehicle to [XXX] Subaru XXX for service. I told [XXX] about it locking down, what is sounded like and what it done. He brushed me off, said that’s what it’s supposed to do and that it had something to do with backup camera. [XXX] went to my car and showed me how to turn backup camera off. Put car in reverse and hold RAB until off. XXX XXX, a dry rotted hose blew out. RAB light was on, check engine and more. I had it towed to [XXX]. I plainly told them it locked down in reverse. They told me my DOG tore it up and gave me a bill for a new transmission. Only 14 k miles. I took it to Hallmark Subaru XXX. I had 3 complaints. Clanking, locking down in REVERSE, jerking. They replaced 3 parts, said it should solve all my problems. And as the usual the old phrase CANNOT DUPLICATE PROBLEMS. Now the RAB system has gone haywire, it does whatever it wants to. My transmission is becoming to a point it sounds like it is going to fall out of my car, 25k miles on this vehicle, haven’t even had it 3 years. The new parts really messed things up. I was going to take it back to Hallmark, but I’m afraid to drive in interstate traffic. BELIEVE ME WHEN I TELL YOU SUBARU CORPORATE KNOWS ABOUT THIS PROBLEM. THE ONLY THING THEY DONT KNOW YET IS THAT IT IS MESSING TRANSMISSIONS UP. IT TAKES A WHILE. SUBARU IS TRYING TO STOP A CLASS ACTION L INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 2, 2026 · Electrical · NY

Brand new vehicle purchased 08/29/2026, backed out of the driveway (on Sept 25, 2026.) A few hundred feet down the road turned right (going ~20 MPH?) and all the dashboard warnings including the check engine light came on and the vehicle began to lose power. Turned the car around, barely made it back into the driveway. The car would not restart after several intermittent attempts. Immediately called the dealer's service dept who instructed me to contact the towing service # listed on the window sticker. It was towed within an hour or so to the dealership. Prior to this specific incident there were no other issues. As of today, (Oct 2, 2026) the vehicle is still at the dealership's service department (7 days and counting). The service dept said they are working with the techs to determine the exact cause which is unknown at this time, but possible electrical or communication issue. No anticipated date of completed repair or return.

Filed Sep 11, 2026 · Engine · CA

the TGV valve metal flap screw came undone and came loose with the intake manifold. piece of metal about 1 in x 2 inch (flap) fell down to cylinder 2 intake and rubbed against the intake valve nipping pieces off and those pieces of metal along with loose screw fell chipping corner of cylinder 2 top edge. at my shop they had to replace cylinder 2 and TGV valve and rebuild the damaged cylinder head. REASON WHY I TOOK IT TO THE SHOP There was small vibrations at a idle at about 800 rpm (stationary) and already replaced the spark plug and fuel injector and it still shook little bit. since i couldn't figure out what was the issue decided to take it to a mechanic. about a week prior to dropping the car off at the mechanics I heard a metal clinking in the engine for a minute and went away. after that the Miles per gallon went from 27 down to 25 miles per gallon. before taking the car to the shop there was a warning light on cylinder 2 on my OBDII reader ( not a full check engine light). a screw shouldn't be loosening in a internal combustion engine part where if not taken care of it can detonate an engine and cost user thousands of dollars and it was not their fault. I researched on this same issue and I found few online where they were showing videos of them moving the loose part with a screw driver. Have not found any one where the part came off completely and went down into the intake valve.

Filed Sep 10, 2026 · Fuel system · PA

I recently noticed that the metal lip and outer cap area of my fuel filler neck is rusting. This isn't just a cosmetic issue this is the exact surface where the gas cap needs to seal to keep the fuel system airtight. Because it’s rusting it’s going to ruin that seal, cause fuel vapor leaks, and trigger a check engine light. In addition to the fuel neck, both my front driver and passenger side windows screech and vibrate heavily whenever they get wet from rain or a car wash. The glass binds up in the wet run channels, which is putting unnecessary strain on the window regulators and motors and makes it difficult to see out of my windows and view my side mirrors properly. Dealership admitted that there are four other vehicles I have within the same make, model,year and similar mileage that have the exact same issue which is a need for there to be a safety recall. They got a bad batch of vehicles with a defect that is affected multiple other vehicles that are like mine.

Filed Jun 26, 2026 · AZ

The thermo control valve (TCV) failed on my Forester (2020 model year). The failure first manifested on 16 June, 2026, with two warning lights: Eyesight Off, and Check Engine. Next day a related failure occurred, described below. Based on my call to dealer, the service department told me the car could be driven if the check engine light was steady, not blinking. It was steady. I then attempted to drive 3 miles to a dental appointment, intending to take the Forester to the dealer next. During this trip, automatic front braking spontaneously began. I was able to cross one lane of city traffic and lurch into a parking lot. Tested around the parking lot the next day, the same automatic braking sequence spontaneously engaged. The word “brake” was constantly illuminated on the dashboard. The vehicle could not be driven and was towed to the dealer. Replacement of the TCV led to the disappearance of the warning lights and ended the continuous automatic braking. The critical point is that, had I not had a dental appointment, I would have tried to drive the vehicle to the dealer in heavy freeway traffic when the automatic braking engaged. This would have put me at great risk of being rear-ended, or, if a vehicle stopped behind me, of that person being rear-ended. Subaru never notified me of the pattern of TCV failure, and, instead, internally extended a warranty on the part for affected vehicles for 15 years or 150,000 miles. A recall and replacement is needed to prevent a potentially highly serious accident.

Filed Jun 23, 2026 · Transmission · 51,000 miles · NJ

The contact owns a 2022 Subaru Forester. While the contact's wife was driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with a failed inhibitor switch. The contact was informed that the inhibitor switch needed to be replaced. The vehicle was being repaired. The contact was informed that parts were on back order. The contact referenced an unknown recall; however, the VIN was not associated with a recall related to the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 51,000.

Filed Apr 15, 2026 · MD

My vehicle has experienced repeated stalling events, including while the vehicle is in operation. The first occurrence began at approximately [mileage] and has continued intermittently despite multiple service visits. During these incidents, the vehicle unexpectedly loses power without warning. This creates a serious safety concern, particularly when driving in traffic, as it increases the risk of collision due to sudden loss of acceleration and potential impact on vehicle control. The issue appears to be intermittent and cannot be reliably reproduced. In some instances, a check engine light has appeared in connection with the events. Despite multiple attempts to diagnose and repair the vehicle at an authorized dealership, the problem has not been resolved. I have been informed that prior issues may have been addressed; however, I was also told that the root cause has not been definitively identified, and there is no assurance that the stalling will not occur again. The vehicle has been in service multiple times without a confirmed fix. Despite this, I have also been told that there are “no safety concerns” and that the vehicle is safe to operate. This is concerning given the unresolved and recurring nature of the issue. The vehicle is primarily used to transport my young children, which heightens the urgency of this safety risk.

Filed Mar 13, 2026 · Acceleration, Brakes · NC

I had two codes on my 2022 Forester over last two weeks. First one u0284 was for the Active Grill Shutter. This happened because for some reason Subaru decided to put the fog lights on the same fuse as the AGS. Fog light blew, shorted out blew the fuse, this caused every safety system in the car to turn off. By default these are open so why does loosing 1-2MPG, or longer time to warm up a car cause every safety feature to turn off. Answer is they kill everything so you have to come in and pay hundreds for $15 bulb. This week had a o2 sensor go bad while I was driving. Had lane assist on , adaptive cruise, etc. Check engine went on and car start to rapidly decelerate, and again all safety features where turned off for something that is not fixed would potential cause reduce MPG, damage the catalytic converter, cause black smoke. None of this should require all safety features to be turned off. This is going to kill someone. I know your not suppose to have your hands off the wheel when using lane assist but people do it. I was in bumper to bumper traffic on 40 going 65 MPH. Not only would I have been at risk but everyone around me. Worse case is I do not have my hands on the wheel, the o2 sensor fails, car pulls into the car beside me and someone dies because Subaru wants money more than safety.