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So why does Subaru think I need hill assist? (merged thread)

2985 Views 12 Replies 6 Participants Last post by  bbottomley
I have been having an odd problem where I have no response to the accelerator on my 2015 Forester. It happens so fast it almost seems like it is my imagination. But it has happened a couple of times now so pretty sure it is really happening.

The problem only seems to occur after I slow down to almost a stop then go to accelerate again. It does not happen all of the time just every once in awhile. If I let off of the accelerator then press again the engine responds.

I don't know if it is related but the Hill Assist light has been coming on lately very periodically. I just had this power failure issue and the Hill Assist warning light had just been on.

I guess I need to keep better track of the symptoms. Not sure if the light was on in the last loss of acceleration episode. I also don't recall if the tach increased when i pressed on the accelerator but I am pretty sure it did not.

Has anyone else seen this problem or is aware of it?
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I have noticed that in older vehicles with automatic transmissions, if you were sitting facing up hill, and you took your foot off the brake, the vehicle would sit in position. However I have now noticed in a lot of newer vehicles the automatic transmission no longer holds the vehicle in position and tends to roll backwards when stopped at a red light if you take your foot off the brake. I have driven 3 European vehicles since 2012: 2013 VW Jetta TDI(DSG), 2011 VW Touareg TDI(Slush Box) and now 2014 Mercedes ML 350 Bluetec(Slush Box). All 3 were automatic transmissions with some form of brake holding feature.

Never really took notice of it much in the Jetta TDI. With the Touareg TDI I could set it for no hold, or automatic hold. I actually preferred the automatic hold in the VW Touareg as it allowed me to take my foot off the brake at a red light without fear of the vehicle rolling forward!!!! The Mercedes is automatic hold only if I pressed hard on the brake while stopped.

In all 3 cases because the vehicles are diesels with loads of torque, they all tend to roll forward on the flat as soon as you took your foot off the brake, so I consider the brake hold feature a nice safety item given that most drivers today are now so distracted that drivers tend to not notice their vehicle is moving forward or backward because their foot is not on the brake.
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The VW Touareg TDI and Mercedes Brake Hold Feature is done electronically using the E-Brake, unlike the above mentioned "Hydraulic" hill holder. I do find the Mercedes one much smoother than the VW unit. When I "launch" by pressing on the GO pedal on the Mercedes there is no notice or feel. Whereas with the VW there was a slight lurch/clunk as the E-Brake releases.

@adc, I did not know that the CVT held it on a hill. Don't own any vehicle with a CVT and will avoid them. I have rented vehicles that have CVT and hate them. I used to own a 2007 Suzuki Burgman 400 scooter which came with a CVT, loved on that vehicle, but when it comes to 4 wheeled vehicles, I prefer DSG or Slush boxes.
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