Hyundai Tucson Diesel 2019 Plate. - DPF ISSUE - Bigdaveg

Hi All

I bought my 2019 Tuscon when it was 6 months old, despite doing on average 10 miles a day during the week and longer runs at the weekend and on holidays etc, it had zero issues, I broke my ankle last September, the Car was stationary for 2 months and has been a nightmare since, essentially around 15-20 miles the dpf light comes on, and then the Engine warning light, a few months ago the Engine light went out and obviously the dpf light goes out/resets when the car is turned off, i use nothing but Esso premium fuel and have tried a lot of different dpf cleaners, a friend who's a mechanic has looked at the car and he cannot see why there's a problem, and that the dpf maybe faulty, I suspect that the 2 months the car was sat still caused a soot build up, can anyone recommend a solution please.

When I bought the car I did find out that a certain batch of Tuscon's went out with a faulty sensor, this was replaced at the time.

Any info / help would be greatly appareciated.

Hyundai Tucson Diesel 2019 Plate. - DPF ISSUE - elekie&a/c doctor
Have any diagnostic tests been done on the vehicle?
Hyundai Tucson Diesel 2019 Plate. - DPF ISSUE - Bigdaveg

Yes, apparently it's coming out as inefficient, flow to high ?.

No probs doing short trips, but go over 15 miles and the dpf comes on regardless of rpm, taking it for a blast 3000 revs for 20 mins+ has no effect.

Hyundai Tucson Diesel 2019 Plate. - DPF ISSUE - elekie&a/c doctor
Lots of things can cause a dpf inefficient fault . Is there a specific P code related to the power train system?
Hyundai Tucson Diesel 2019 Plate. - DPF ISSUE - Bigdaveg

Btw thanks for the replies, the fault code was P200300.

Hyundai Tucson Diesel 2019 Plate. - DPF ISSUE - elekie&a/c doctor
That fault code may be related to an issue with the dpf pressure sensor. More investigation required.
Hyundai Tucson Diesel 2019 Plate. - DPF ISSUE - Bigdaveg

Apparently one glow plug is out as well.

Hyundai Tucson Diesel 2019 Plate. - DPF ISSUE - elekie&a/c doctor
That’s not going to help , as the glow plugs are used to help dpf regeneration.
Hyundai Tucson Diesel 2019 Plate. - DPF ISSUE - Bigdaveg

Yep, literally just watched a video about that, essentially a glow plug failure can and does lead to a dpf fault.

It's funny that none of the many vids and comments I've seen elsewhere have posed the question about a faulty glow plug.

Which is a surprise given the huge amount of people who've reported DPF faults in Hyundai's and Kia's. Wonder how many actually only needed new glow plugs ?.

Update:

The Glow plugs were changed and the fault code cleared, 14 miles later the injector light came on, and shortly afterwards so did the EML.

So I've tried all manner of cleaners, replaced the glowplugs and still have a dpf issue, I've heard of deep cleaning and forced regeneration etc, so realistically what's the best way of clearing the problem ?. The one question that no one's been able to answer is why does the injector light come on at the 14-15 mile point (turn it off before that, say 10 miles and then restart and it'll come on 14-15 miles later, so effectively if you keep turning the car off every 13 miles the light won't come on ?.

Edited by Bigdaveg on 30/09/2025 at 18:56