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Cruise-control not working in 2015 Subaru Forester

Asked by Ross

I have an ongoing electrical problem with my 2015 Diesel Forester that my Subaru dealer has been unable to rectify. The cruise-control light flashes and then the cruise-control does not work; the hill-start light flashes; the vehicle dynamic system light flashes; and also, the emission-control system warning light comes on.

Answered by CarsGuide

31 Aug 2020 David Morley

Without being able to scan the car from here, this sounds like a classic case of a body computer that is suffering a slow death. This computer is the one that links all the car’s major functions, including those ones you’ve listed as being on the blink. Random failures of these systems all at once point to the computer itself rather than the systems themselves.

Hooking the car up to a scanner at a workshop will tell you a lot more about what’s going on as the mechanic should be able to read the fault codes and make a diagnosis from there. The alternative cause is a poor earth somewhere in the car or a dodgy battery that is playing hell with the computer’s power source. Modern cars will not tolerate a poor power supply or earthing problems.

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