Bad news ahead! I was about to drive my weekly highway driving routine to prevent GPF warnings from coming again. But here it was when I started my car.
GPF software update was done in January. ODOmeter had then 13221 km on the clock. Now in March I had 17977 km. So it is exactly 4756 km after the software update. In comparison before the update the longest interval was 5929 km but that was done in summer. Summer time should be easier anyway as the outside temperature is much higher.
In February I had some longer trips, which explains why I got GPF warning this much later. And of course hopefully that software update has something to do also.
Last week I had my typical amount of short distance driving.
GPF software update – does it help
Probably it helps. At least a bit. As seen above. I had now a longer interval before the warning came again, compared time prior to the update. Interval between warnings was only less than 1000km. Sometimes even only 250km.
But clearly we see that e-Boxer is not free of GPF issues. It is very likely that you will get orange light at some point, especially if you have short distance driving involved. Got the software update or not.
Adventureforester blog reader sent me insight of his case. His car seems to have even more GPF issues than I do. Local dealer revealed something interesting. Forester has values from 0 to 15 regarding soot levels. When exceeding soot value of 5, GPF warning will illuminate on the dash. Light will go off once the threshold value is 3 or less. Dealer’s advice was to continue the forced regen cycle even light goes off. It will continue burning soot and you will get value to closer zero. Otherwise when the light goes off but it might be still close to the threshold, the car will light it again soon.
On the other hand if the driver does not care and soot level continues to accumulate, the car will go to limp mode when soot level exceeds 15.
It is unclear what unit this soot level is or how fast it will accumulate. Unfortunately it is impossible to observe from the dash. Only information the driver gets is this orange informative warning of the GPF filter.
In theory that is 33% full when light is lit and there is plenty of time to take care of the warning. My advice is still to take care of that warning in the first place.
How serous the GPF warning is
Subaru classifies warning as informative message. Even the color of the message is orange, which means typically something that driver needs to pay attention rapidly. In this case message means that the soot threshold value has exceeded but it looks like there is plenty of time to before it will actually impact to the driving. However as advised above, better to take care of it sooner than later.
Message is annoying but it looks like it is as Subaru classifies it. Does not really harm as long as you are able to take care of the issue promptly.
Subaru, if you are reading
It would help really much if the driver could observe soot levels from the dash. There are customizable icons on the Multi Function Display. Soot level could be easily there for those who are interested. And maybe a symbol to see when regen is in operation. It would help so much to understand GPF behavior better.
Other e-Boxer owners
Please comment here or send me insight of your car through the contact form. Have you had issues with the GPF or not? If not, that would be interesting to know as well. Also what type of driving you typically drive.