I have already reported Subaru Forester e-Boxer GPF related observations in this blog.
This time I decided that GPF light deservers own fresh blog post since this is already fourth time I have this informative message (as Subaru calls it) displayed within one year. Reason I decided to write a separate blog post, instead of just updating the older post is that this time I managed to drive just little above 300km since previous “informative message”.
Now this starts to be little worrying. If this is going to bug me more and more often. There is so many great characteristics and features with the Forester that I really do not want to start thinking to drive different car but ultimately that would be the final solution. To find car that does not have GPF implemented at all. Maybe some plug-in car would fit better for me. But before going there, I really want to find way to sort issue out and keep this car. Just thinking that we’re on thin line now.
GPF can be a issue for those who drives short distance driving. Short distance driving is relative of course but from the car point of view travel is too short when engine does not warm-up to the normal operating temperature. Specially oil temperature seems to be crucial. And you need to drive fast enough to get GPF regeneration process started.
In my case it seems that I drive way too often few kilometer stops. To the daycare is just few kilometers away from our home. Similarly grocery store is few kilometers away. During COVID era, I rarely need to go to the office but when I need, it is also less than 10 kilometers away. So there is plenty of those short distance places where to go.
However, during free time, I drive longer distances with my family to nature trails and to other hobbies. So it is not only city type of driving what I have. But still it seems that those occasionally long distance driving’s are not enough to handle Forester GPF issues.
GPF during winter
Also colder outside temperatures during winter, combined to short distance driving is a poison for the GPF. As it is seen from the table in older post, summer time was much easier regarding this GPF issue. Now when temperatures have dropped, it seems to be fact that GPF light lit on with much frequent pace.
Solution for that would be then to drive long distance driving more but is that then more sustainable to the environment? I believe the intention of that filter in the first place was to reduce emissions produced by the car. And now it is required to drive more in order to get that filter operate properly? Greetings to the European Union.
GPF forced regen procedure
This time forced regen procedure followed normal cycle. In other words drive over 60 km/h and keep rpm between 2000 – 2500 rounds per minute. It is little difficult to tell when regen exactly starts but oil temperature display should give a hint. Typically oil temperature seems to be over 80 Celsius degrees while during regen procedure it can be somewhere near 93 Celsius degrees. To get procedure fully completed, it should take approx. twenty minutes to complete. Once procedure is completed, GPF symbol goes off on the car dashboard.
How to fix e-Boxer GPF issues
The best way to fix GPF related issues is to adapt driving style and profile to meet required operating temperatures to get regeneration procedure complete often enough. If GPF light lit on regularly, it is a clear sign that traveled distances are just too short. Only way I can think of is that have longer driving at least on weekly basis.
In my case next step is to drive highway weekly. I am not choosing the nearest grocery store but e.g. on Friday’s I will drive 30 km away from home and see if that sorts the issue out. Another solution would be to download RAV4 Hybrid plug-in price list to my computer and start opting features but Forester is too good car with so many features to love. E.g. excellent drive, all-around-visibility, quietness and superb AWD with hill descent control. Not to forget safety features it has.
I already thought that now this issue is sorted out when I change my driving behavior so that there is at least weekly highway driving. But no, 15th of the December 900 km later since previous GPF warning I had filter light symbol lit again. This time it required longer regen procedure than usual. Earlier 20 minutes of driving was enough to warning light go away. This time it required 40 minutes of driving. So my next hope is that software update will solve the issue. Based on the comments on this blog post and also confirmed by the local service that there is really a update available by Subaru to address GPF related issue.
Please remember also to check full table how often GPF warning comes in my driving scenarios.