2016 2.5 Isuzu Dmax DFP issue

GC88

Member
Hello all, new here and first post.đź‘‹

I'm hoping (and I expect I'm not alone with this) that someone has encountered and solved the problem I'm experiencing.

I bought a used 2016 2.5L Isuzu Dmax Blade with 55k on the clock about 6 weeks ago.
The issue is the vehicle is doing a DPF regen in perpetual cycles.
It runs through the full process and then the dash warning light goes off.
From a cold start even when the PM level is zero, within a mile or two the PM level hits maximum and the cycle starts again.
About 15 or 20 miles after it's completed (sometimes even less) it starts yet again.
I typically don't do short stop start town driving, usually longer.
I don't use supermarket fuel, only Shell, BP, Esso etc.
I've plugged in the ELM327 ODBC reader during the regen and it reports on faults.
The vehicle is still under warranty from a company called 2020warranty who've said I need to take it in to get diagnosed.
The garage that checked it said their systems don't find any fault codes either, he said it should go to the Isuzu main dealer as their diagnostics are probably better and there could also be a software update for it.
He said the injectors and sensors were all within tolerance.
He refused to remove the DPF itself and check it's condition.

All that said, what do any experienced forum members here think the root cause of this is and what's the solution?

I'm thinking that maybe the main dealers would be able to do a more advanced diagnostic check?

thanks
 

Timbo

Member
Location
Gods County
Hello all, new here and first post.đź‘‹

I'm hoping (and I expect I'm not alone with this) that someone has encountered and solved the problem I'm experiencing.

I bought a used 2016 2.5L Isuzu Dmax Blade with 55k on the clock about 6 weeks ago.
The issue is the vehicle is doing a DPF regen in perpetual cycles.
It runs through the full process and then the dash warning light goes off.
From a cold start even when the PM level is zero, within a mile or two the PM level hits maximum and the cycle starts again.
About 15 or 20 miles after it's completed (sometimes even less) it starts yet again.
I typically don't do short stop start town driving, usually longer.
I don't use supermarket fuel, only Shell, BP, Esso etc.
I've plugged in the ELM327 ODBC reader during the regen and it reports on faults.
The vehicle is still under warranty from a company called 2020warranty who've said I need to take it in to get diagnosed.
The garage that checked it said their systems don't find any fault codes either, he said it should go to the Isuzu main dealer as their diagnostics are probably better and there could also be a software update for it.
He said the injectors and sensors were all within tolerance.
He refused to remove the DPF itself and check it's condition.

All that said, what do any experienced forum members here think the root cause of this is and what's the solution?

I'm thinking that maybe the main dealers would be able to do a more advanced diagnostic check?

thanks
Go straight to isuzu with it. Dpf issues are very well documented and there are at least 9 software versions all of which address regen issues, latter ones do fix it. Failed injectors and stuck egr's also very common. Before you drive it any further check the oil level though. If over the max get it drained immediately.

If acouple of goes at the dealer doesnt make any improvement, sell it.
 

pettsy

Member
Location
Derbyshire
Mine started doing it, main dealer weren’t interested in getting to the bottom of it despite being reported before end of warranty. Was thinking of selling but useless dealer confirmed my thoughts and Sold it shortly after.
 

GC88

Member
Go straight to isuzu with it. Dpf issues are very well documented and there are at least 9 software versions all of which address regen issues, latter ones do fix it. Failed injectors and stuck egr's also very common. Before you drive it any further check the oil level though. If over the max get it drained immediately.

If acouple of goes at the dealer doesnt make any improvement, sell it.
Thanks for the feedback. The issue is that the warranty company (2020 warranty) excludes main dealers from doing anything due to the cost of the hourly labour rate. This warranty was supplied with the vehicle when I bought it so I want to exhaust (haha) their options.
However, I've contacted a main dealer near me (Devises) and asked for their input.
I will pay for their diagnostics myself if necessary to at least get a decent report that an indy can hopefully use to fix it with.
I've also asked for a software update if one exists, I will happily pay for that too.
If as you say, after a couple of attempts to fix it fails, I will get rid and get a Hilux or a Ranger rather.

Incidentally, this is the 3rd Isuzu I've had, the first 3.0 Rodeo never did this, and my 2014 2.5 Dmax Solar (in Italy) never once did a regen either in the 5 years I drove it there.
 

GC88

Member
Booked into the main dealer for next week. ÂŁ120 for a diagnostic and ECU software upgrade if one is available for my vehicle. I will post an update here when I have more information for those interested.
 

Macsky

Member
Livestock Farmer
Location
Highland
Hello all, new here and first post.đź‘‹

I'm hoping (and I expect I'm not alone with this) that someone has encountered and solved the problem I'm experiencing.

I bought a used 2016 2.5L Isuzu Dmax Blade with 55k on the clock about 6 weeks ago.
The issue is the vehicle is doing a DPF regen in perpetual cycles.
It runs through the full process and then the dash warning light goes off.
From a cold start even when the PM level is zero, within a mile or two the PM level hits maximum and the cycle starts again.
About 15 or 20 miles after it's completed (sometimes even less) it starts yet again.
I typically don't do short stop start town driving, usually longer.
I don't use supermarket fuel, only Shell, BP, Esso etc.
I've plugged in the ELM327 ODBC reader during the regen and it reports on faults.
The vehicle is still under warranty from a company called 2020warranty who've said I need to take it in to get diagnosed.
The garage that checked it said their systems don't find any fault codes either, he said it should go to the Isuzu main dealer as their diagnostics are probably better and there could also be a software update for it.
He said the injectors and sensors were all within tolerance.
He refused to remove the DPF itself and check it's condition.

All that said, what do any experienced forum members here think the root cause of this is and what's the solution?

I'm thinking that maybe the main dealers would be able to do a more advanced diagnostic check?

thanks
I’ve got a dmax, regen warning lamp was starting to come on daily and before I took the dpf off and drilled a hole in it I bought a bottle of wynns professional dpf cleaner and poured it in the tank and I haven’t seen the light since, got to be worth a try first I’d say.
 

GC88

Member
An update. The main dealer did a scan, no codes were found.
No surprise there as my ELM327 and the indy's several readers found nothing either.
They did a "soft regen" - I'm not really sure what that means, I believe it's a forced regen while the vehicle is stationary, not being driven.
The onboard computer was reset, not 100% sure that that means either, but I was told this is the sequence of actions performed via the ignition on and off etc. Which seems pointless to me.
I didn't speak to the technician who did that diagnostic, only the guy in the show room, likely a service manager or similar.
He wasn't particularly knowledgable.
He couldn't tell me what version of software my vehicle was running or if there was an update available.
As such, no ECU update / flash was done.
I was told that the reason for not knowing is because there were no error codes displayed, as a result, no recommendations / fixes were suggested.
It seems that they really don't understand the issue or how to attempt to fix it via a software flash.
I was told to monitor it.
Needless to say, a regen happened about 12 miles after leaving.
The one difference was that this time there was no dashboard light or audible "ding ding" signal, it happened quietly in the background.
I was watching the PB Levels screen that's how I knew it was happening. If I had been in the mileage screen I wouldn't have known.
I was also told that there was a staff member there who drive very short distances and that vehilcle would regen constantly, and they essentially accept that as normal.
So that's it in a nutshell.
I suppose I have a few options now, try find a specialist tuner who can tell me what software it's running and who can flash it.
Try the DPF Doctor.
Live with it.
Sell it.
For now I will simply keep it and carry on living with it.
In time I will likely sell and by a HiLux.
 

MrNoo

Member
Arable Farmer
Location
Cirencester
Avon tuning are complete whizzes when it comes to that, mine was fine, had it mapped with them. Didn't mess with the DPF at all or mapping of it but I have only seen it regenerates once since I've had it, I have covered 60k miles for 1 regen. Not sure if it was mapped out before I got it or just that's how it is. It does get a hard life and the only thing I've changed on it was the EGR valve as this was sticking/stuck. 124,000 miles and goes like a train esp when towing.
 

Timbo

Member
Location
Gods County
Avon tuning are complete whizzes when it comes to that, mine was fine, had it mapped with them. Didn't mess with the DPF at all or mapping of it but I have only seen it regenerates once since I've had it, I have covered 60k miles for 1 regen. Not sure if it was mapped out before I got it or just that's how it is. It does get a hard life and the only thing I've changed on it was the EGR valve as this was sticking/stuck. 124,000 miles and goes like a train esp when towing.
The remap will have corrected the pee poor factory regen stategey where they dont / cant passively regen, and rely on the active regen to keep the dpf clean as well as deleted the egr system. You'll not normally notice a passive regen occurring unless you're very very savvy.
 

MrNoo

Member
Arable Farmer
Location
Cirencester
The remap will have corrected the pee poor factory regen stategey where they dont / cant passively regen, and rely on the active regen to keep the dpf clean as well as deleted the egr system. You'll not normally notice a passive regen occurring unless you're very very savvy.
Yes, mine is the poverty spec one, I just noticed the yellow dash symbol and it sounded a bit rattly compared to normal.
 

GC88

Member
Avon tuning are complete whizzes when it comes to that, mine was fine, had it mapped with them. Didn't mess with the DPF at all or mapping of it but I have only seen it regenerates once since I've had it, I have covered 60k miles for 1 regen. Not sure if it was mapped out before I got it or just that's how it is. It does get a hard life and the only thing I've changed on it was the EGR valve as this was sticking/stuck. 124,000 miles and goes like a train esp when towing.
That's great info, thanks. I will contact them and see if they can remap this fkn thing! Bristol is close enough too, so that's a bonus.
 
An update. The main dealer did a scan, no codes were found.
No surprise there as my ELM327 and the indy's several readers found nothing either.
They did a "soft regen" - I'm not really sure what that means, I believe it's a forced regen while the vehicle is stationary, not being driven.
The onboard computer was reset, not 100% sure that that means either, but I was told this is the sequence of actions performed via the ignition on and off etc. Which seems pointless to me.
I didn't speak to the technician who did that diagnostic, only the guy in the show room, likely a service manager or similar.
He wasn't particularly knowledgable.
He couldn't tell me what version of software my vehicle was running or if there was an update available.
As such, no ECU update / flash was done.
I was told that the reason for not knowing is because there were no error codes displayed, as a result, no recommendations / fixes were suggested.
It seems that they really don't understand the issue or how to attempt to fix it via a software flash.
I was told to monitor it.
Needless to say, a regen happened about 12 miles after leaving.
The one difference was that this time there was no dashboard light or audible "ding ding" signal, it happened quietly in the background.
I was watching the PB Levels screen that's how I knew it was happening. If I had been in the mileage screen I wouldn't have known.
I was also told that there was a staff member there who drive very short distances and that vehilcle would regen constantly, and they essentially accept that as normal.
So that's it in a nutshell.
I suppose I have a few options now, try find a specialist tuner who can tell me what software it's running and who can flash it.
Try the DPF Doctor.
Live with it.
Sell it.
For now I will simply keep it and carry on living with it.
In time I will likely sell and by a HiLux.
Don't just live with it, as mentioned before it is very common for your engine oil level to climb and eventually the engine goes bang if you don't keep an eye on it.
From what I understand in my laymans terms your ecu is telling your truck to regen too frequently, if it can't complete the regen it dumps the fuel into the engine increasing the level. The problem is often associated with a faulty injector which can accelerate the situation or some have said can be caused by the regen issue itself.
Unless there is a problem with the injector the regen problem shouldn't show up as an error code because your truck just thinks it has a dirty DPF all the time.
I had my DPF cleaned, sorted it for a bit but the problem came back.
The only long term solution I belive is internal DPF removal and remapping to delete the DPF, unfortunately for me I've not heard of anyone in the South East who does it on IZUZUs
 

GC88

Member
Don't just live with it, as mentioned before it is very common for your engine oil level to climb and eventually the engine goes bang if you don't keep an eye on it.
From what I understand in my laymans terms your ecu is telling your truck to regen too frequently, if it can't complete the regen it dumps the fuel into the engine increasing the level. The problem is often associated with a faulty injector which can accelerate the situation or some have said can be caused by the regen issue itself.
Unless there is a problem with the injector the regen problem shouldn't show up as an error code because your truck just thinks it has a dirty DPF all the time.
I had my DPF cleaned, sorted it for a bit but the problem came back.
The only long term solution I belive is internal DPF removal and remapping to delete the DPF, unfortunately for me I've not heard of anyone in the South East who does it on IZUZUs
I always allow the regen to complete and I am keeping an eye on the oil level.
The dealership also confirmed all was ok with regards to that, no oil level resetting was required.
Since making that post, I have emailed Avon Tuning as recommended by MrNoo, hopefully they can remap it and that will be the end of the issue. As no fault codes were found (by at least 4 different code readers) I have to assume the injectors are ok.
I don't want to go the DPF gutting + remapping route tbh, I don't want MOT failures.
 

Timbo

Member
Location
Gods County
I always allow the regen to complete and I am keeping an eye on the oil level.
The dealership also confirmed all was ok with regards to that, no oil level resetting was required.
Since making that post, I have emailed Avon Tuning as recommended by MrNoo, hopefully they can remap it and that will be the end of the issue. As no fault codes were found (by at least 4 different code readers) I have to assume the injectors are ok.
I don't want to go the DPF gutting + remapping route tbh, I don't want MOT failures.
The right mot man be fine
 

Ed ardudwy

Member
Livestock Farmer
Avon tuning supply the map for independents too. I live in North Wales and have had the car and truck remapped huge difference.
Haven't had a dpf delete though my vehicles are pre dpf, egr been done though
 
Avon tuning supply the map for independents too. I live in North Wales and have had the car and truck remapped huge difference.
Haven't had a dpf delete though my vehicles are pre dpf, egr been done though
So I could get Avon to send the map needed (for a fee) to my local tuning place and then they could do it?
 

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