2015 Subaru Forester: adaptive cruise control problems

Filed Jun 20, 2023 · Transmission · 73,600 miles · CA

The contact owns a 2015 Subaru Forester. The contact stated while driving 40 MPH, the vehicle accelerated at high speed and stability, the traction control, the check engine, and the cruise control warning light illuminated, and the vehicle would not accelerate. The contact turned off and restarted the vehicle and the vehicle operated normally. The vehicle was taken to the dealer, but no failure was found. The contact stated that the failure reoccurred. The vehicle was taken to the dealer and the transmission module was updated, but the failure reoccurred. The vehicle was taken to the dealer and the throttle pedal assembly was replaced multiple times, but the failure persisted. The manufacturer was contacted, and a case was filed. The failure mileage was 73,600.

Filed Aug 4, 2022 · Acceleration, Fuel system · CA

I was driving with cruise control going around 70 when the car started slowing down suddenly. Not wanting to slow down even more, I turned off the cruise control by hand using the cancel button on the steering wheel (rather than tap the brake) but when I then hit the accelerator, the engine felt like it was in neutral, revving past 6000 rpm on the tachometer. At that point, I realized I had no control over the drive train so I pulled off the road onto the center median of the highway, just as the engine died - fortunately, there wasn’t anyone following close behind. We had been driving for about 1.5 hours with the AC blasting and the gas tank at that point was low, with less than 1/8 remaining. All this happened without any dashboard warning lights turning on. This was the very last leg of a ten-day, 2,000 mile road trip. I tried restarting the engine but only got clicking. Since I thought we’d be struck a while and it was so hot, I turned the key to the accessory position and was able to roll down the windows. We sat there for a couple of minutes wondering what to do. It took another minute to find my AAA card. Before calling for roadside assistance, I tried starting the engine again and this time it turned over. We did not have any further problems in the remaining 100 miles of our trip (though I was very anxious about it happening again). I took the car in to a Subaru service center this morning (36 hours later). They did a multi-point inspection and road test but did not find any issues and were not able to replicate the problem.

Filed Jan 25, 2022 · Engine · ME

Cam carrier/front cover seal failed on our 2015 Forester with the 6 speed MT. This oil leak has ruined the O2 sensor, the drivers side VVT solenoid and according to the dealer has caused oil to run down the wiring harness which will cause further sensor failures if not corrected. All told the dealer wants over $3700 to fix the issues and will not warranty any parts unless the oil leak is fixed. The car currently has ~105k miles on it, out of warranty, but we had mentioned oil loss issues to our mechanic and local Subaru dealer when the car was serviced for the 2019 airbag sensor recall. The car was 4 yrs old, had ~65k miles and was "consuming" about 1 qt per 2500 miles at which time the low oil light would come on, but not the check engine. The concern was dismissed by the dealer as minor and likely oil consumption common on this engine. This is concerning as I now know that a service bulletin for this leak was issued in 2019. Now the car "consumes," leaks, about 1 qt every 1500 miles with no visible signs under when parked, but does have a distinct smell of burned oil in the car when idling in the driveway or stopped in traffic. The check engine light is no on constantly and cruise control does not function.

Filed Feb 26, 2021 · Driver assistance, Electrical · 40,000 miles · MI

At 40,000 miles the eye sight cameras have failed, according to the dealer. That system no longer works nor do I have cruise control. The cost to repair is $2,306.58.

Filed Oct 14, 2020 · Transmission · 67,809 miles · FL

Using cruise control at 77 MPH in fast lane of i95 northbound from fl when, approx 10 miles south of va border, I felt a snap like pull in vehicle - kind of like a rope breaking when playing tug of war. The rpms increased and car rapidly lost speed and would not accurate. Fortunately, I was able to safely pull off i95. I noticed all lights on dash were on and car was running. I turned it off, approx 15 to 30 seconds after pulling off highway. After I turned car off, it would not restart. I was towed (innerstate towing) to a toyota dealership in roanoke rapids, nc due to no subaru dealership. Toyota tech looked at car and car started fine. The mechanic felt the transmission over heated. I then limped along to subaru dealership in colonial heights, va. I traveled in slow lane on i95, at no more than 70 MPH, with a full tank of gas and no issues. A subaru tech drained fluid and found metal. It was determined the transmission needed replaced. While at toyota dealership, I contacted the location where I purchased my subaru forester and that tech indicated it was a faulty fuel pump or transmission. When car lost speed, I had two fuel bars left. I am now getting the pump tested as well. Fortunately, my car is under warranty due to subaru's extension but I find this unacceptable. I could have easily been killed in an instant. This is my 3rd subaru and I have had more problems with this one than my two previous cars combined. Further, I keep going up in models and price point but the quality has declined. I am a loyal subaru customer but I think this model may be my last. Because nothing seized up and no loud bang, jerking, or rattling; I am beginning to suspect it was the fuel pump and I coincidentally the bad transmission was discovered. No belts were broken and the snap like noise is unknown. I have no invoices yet and police were not called. I am driving a loaner car.

Filed Jul 30, 2020 · Acceleration, Fuel system · 67,000 miles · IN

While driving on the highway at 65mph the car lost all power. The rpms went up like it was in neutral (car was still in drive). Fuel tank was down to a little less than 1/4th of a tank but still had 100 miles until empty. Adaptive cruise was engaged at the time (automated cruise applied accelerator that rose the rpms to 4500). This was in the middle of a 4 hour road trip on a flat straight road. Car exhibited no warning or lights until complete power was lost. I was able to safely pull over to the shoulder. All lights came on in the dash after I was stopped. I turned the car off and I was able to immediately start it again. Shortly after I filled up the tank and the car drove fine for the next hour until I was home. This was a scary incident that could be very dangerous. I noticed that this car has about a dozen other reports that are much like this in the past year.

Filed Jul 6, 2020 · Engine, Fuel system · 76,000 miles · NC

My vehicle lost power while driving today on the interstate. I had cruise control set and the car was accelerating up a hill. It was like my car shifted into neutral. I was able to safely get to the shoulder and initially my car would not restart. I did get it to restart after a couple of tries and drove it home. I see a recall for a similar issue: 19v‑856, but my car is not included. I have replaced the pcv already and this is the second time my car has done this toward the end of a long road trip (1000+ miles).

Filed Jun 8, 2020 · Engine, Transmission · 73,000 miles · MD

Going 70 miles an hour on interstate with cruise control on, when the gas light came on the car lost power like it switched to neutral. We made it to the side of the road and the engine shut off. This happened twice.

Filed May 6, 2020 · Acceleration, Engine · 82,300 miles · TN

While driving in the highway at 75 MPH with cruise control on the car suddenly went to 5000 RPM and at the same time started to brake all the lights in the dashboard came on I pulled over and the car's engine shut down. I tried to started about 5 06 times the car wouldn't star and after that the car was completely dead. I had it tow to a shop. The next morning it started like nothing the mechanic at the shop said it was the battery.after changing the battery I took it to the gas station after putting gas it wouldn't start again after several tries it started.at this point I don't think the battery was the issue but I am glad I got home. This happened in starkville ms 200 miles from where I live.

Filed Mar 15, 2020 · Driver assistance, Fuel system · 129,735 miles · AZ

We were driving down the road approx 65 and the eye sight disabled, ABS disabled, traction control and hill assist stopped, cruise control stopped at transmission oil started flashing and then check engine light all came on we were driving down hwy 61 in az. Power to the vehicle slowed and we could not go faster than 40mph. The brake light switch was on recall and replaced 10/2019 and the 3xacr same thing happened except the check engine light didnt come on.

Filed Jun 6, 2019 · Acceleration, Engine · 93,000 miles · KS

Twice while driving on the interstate on a 3-4 hour trip going approximately 70 MPH using cruise control with approximately 1/12 - 1/6 tank of gas, my engine began to rev and at the same time lost power and speed. The first time I pulled off the road, shut the engine off, waited approximately 10 minutes and was able to restart the engine and finish my trip. It happened the second time with mostly identical circumstances. I pulled off the road, turned off the engine, waited and was unable to start the engine. I had to tow my vehicle to a dealership. They ran diagnostics with nothing turning up. They were however able to start the car when they tried. This was extremely dangerous being in 70 MPH traffic and having no speed control. I have the dealership paperwork from the service. Now the engine does not seem to have the normal power it usually does when accelerating. *tt

Filed Apr 7, 2019 · Electrical · 44,650 miles · MI

Cruise control stopped working while I was driving at high speed, 70mph, on interstate. Car speed immediately started dropping. Cruise control would no longer engage.