Start/Stop Stops Working - Engine Must Be Running

[Flakmunky]

Hi,

Wondering if anyone else has encountered this little glitch, whereby the Start/Stop will not stop the engine as it should. When you go to look at the Start/Stop status it says 'Engine must be running'...

Take a look at the pic...

As you can see from the rev counter, the engine is running! Start/Stop is activated and I'm stopped.

[AlasdairMac]

There are a number of reasons, including particulate filter regenerating, battery not charged sufficiently, engine not up to temperature, aircon on and still working to achieve requested temperature. They are all listed in the user manual.

PS. Looking at the idle rpm in your photo, I’d say it’s the particulate filter. Normal idle is 750/800 but it goes up to 1000 when regenerating.

[Flakmunky]

Hi, thanks for the reply.

The reason given by the car is 'Engine must be running'... When clearly the engine is running! I can rule all of your reasons out other than regeneration... I'll keep an eye on that.

Out of interest, I've only done 1800 miles. Would it regenerate in that time? My XF would go 000s of miles between regeneration.

[Tet70]

Out of interest, I've only done 1800 miles. Would it regenerate in that time? My XF would go 000s of miles between regeneration.

The maximum time between regeneration used to be around 500 miles in the older VW group diesels. Nowadays, with all the SCR and other stuff added, I'm not sure what's the typical interval. That 500 mile limit was based on the driven distance, and was only a safeguard. Normally, the regeneration interval is based on a differential pressure measurement, which can trigger the regeneration more often. Some people who own new VW group diesel, and drive mostly short trips in the city, have reported intervals as low as 150 - 200 miles.

[Rory]

Out of interest, I've only done 1800 miles. Would it regenerate in that time? My XF would go 000s of miles between regeneration.

The maximum time between regeneration used to be around 500 miles in the older VW group diesels. Nowadays, with all the SCR and other stuff added, I'm not sure what's the typical interval.

We have one of the last of the mk1 Tiguans, with the latest EA288 engine and AdBlue. I reckon it's regenning about every 300 miles.

[Flakmunky]

Oh, wow! I didn't expect it to be that often.

I'll keep an eye out for the rpm next time I notice this happening.

Thanks!

EDIT: The information on why the engine hasn't stopped is still incorrect, however!

[Smiffy]

Could this be a bad translation from German/Spanish/whatever? Perhaps it's trying to say that, perhaps because of regen, the engine is required to be running, so can't be switched off?

[Flakmunky]

Ah! That would make sense!

If I switch the engine off and back on again, normal service is resumed. Does that cancel regeneration? Is regeneration also occurring when the engine cooling fan is going mental on switch off?

[Rory]

Ah! That would make sense!

If I switch the engine off and back on again, normal service is resumed. Does that cancel regeneration? Is regeneration also occurring when the engine cooling fan is going mental on switch off?

Yes to both of those. We don't use stop/start in the Tiguan but if you do and it won't work that's a sure sign regen is in progress.

Ideally don't stop a regen. VAG don't put any indication it's in progress as they don't want people driving un-necessarily. Regen will restart next time conditions are right - in our Tiguan that can be as soon as 3 miles from a cold start but if you use the car for short journeys you don't want to get into a cycle of several aborted regens or you'll start to get dpf warnings on the dash.

[Tet70]

Ideally don't stop a regen. VAG don't put any indication it's in progress as they don't want people driving un-necessarily. Regen will restart next time conditions are right - in our Tiguan that can be as soon as 3 miles from a cold start but if you use the car for short journeys you don't want to get into a cycle of several aborted regens or you'll start to get dpf warnings on the dash.

Well, I would say you do get the indication, a kind of. That's the DPF warning you are talking about.

That warning is there just to indicate, that you should run uninterrupted regen cycle. And that's a same procedure that you recommend people to do every time the regen is on, even though there is no good information present that will tell you when that happens. So why not just drive normally, and if the DPF light goes on, THEN drive the uninterrupted regen cycle.

I had a VW group diesel before the Ateca, and I didn't worry about the regen. It was interrupted many many times, but I didn't get the DPF warning light even once.