P1445 Error - Quantity of additive too high on 2006 Citroen C5

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LeoBenz
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P1445 Error - Quantity of additive too high on 2006 Citroen C5

Post by LeoBenz »

Hey, everyone.

I have a 2006 Citroen C5 with the 1.6 (109 hp) HDI Engine.

Currently, the car is emitting a lot of white smoke out from the exhaust. On idle, the smoke quantity is noticeable, but manageable, however, if I get the car driving, there is a huge cloud of white smoke behind me, making the car impossible to drive (at least on public roads). Other than that, the engine is running fine, good power, no hesitations and stable idle.

I ran the scan tool and the only error it showed the P1445 fault code (Additive system, quantity of additive too high). I think that this has something to do with the DPF additive system, I think that somehow the exhaust system is somehow burning quite a bit of Eolys fluid.
P1445 Error.jpg
Could there be a leak from the Eolys tank to the exhaust? Is there a valve that could be broken or stuck open? I'm afraid to even turn on the car in this state, as it does not seem safe. I'm not afraid of removing the DPF parts from the car (to clean, replace or repair), but I have no idea where to start.

If anyone had this problem, which parts could I check and inspect first? Any help would be greatly appreciated.

Thanks in advance.
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GiveMeABreak
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Re: P1445 Error - Quantity of additive too high on 2006 Citroen C5

Post by GiveMeABreak »

No, the Eolys has nothing to do with the exhaust. It is stored in a separate tank and only injected into the fuel tank in small doses whenever diesel is added.

This code is to do with the additive pump itself, so if the pump is faulty it may be injecting too much additive into the fuel, but this is likely to be a separate issue to the white smoke.

The issue of the white smoke will likely be something totally different - on a diesel this can mean too much fuel is being injected. It can also mean an internal coolant leak or turbo burning oil or even Head Gasket issues.
Fault Code: P1445
Description of Fault: Additive system: Quantity of additive remaining in the tank too great. The total quantity of additive injected is more than 80 g for 1 second.
Conditions for Fault to clear: Ignition on
Downgrade Modes whilst Fault is active: -
Symptoms: -
Suspect Areas: Additive pump
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Marc
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Re: P1445 Error - Quantity of additive too high on 2006 Citroen C5

Post by LeoBenz »

GiveMeABreak wrote: 25 Apr 2023, 19:42 No, the Eolys has nothing to do with the exhaust. It is stored in a separate tank and only injected into the fuel tank in small doses whenever diesel is added.

This code is to do with the additive pump itself, so if the pump is faulty it may be injecting too much additive into the fuel, but this is likely to be a separate issue to the white smoke.

The issue of the white smoke will likely be something totally different - on a diesel this can mean too much fuel is being injected. It can also mean an internal coolant leak or turbo burning oil or even Head Gasket issues.
Fault Code: P1445
Description of Fault: Additive system: Quantity of additive remaining in the tank too great. The total quantity of additive injected is more than 80 g for 1 second.
Conditions for Fault to clear: Ignition on
Downgrade Modes whilst Fault is active: -
Symptoms: -
Suspect Areas: Additive pump
Thanks, I'll look into it. Head gasket seems fine (no coolant mixing with oil, oil is on the correct level and black as it should on a Diesel, coolant level is also correct).

I'll check the Turbo and injectors then.
GiveMeABreak wrote: 25 Apr 2023, 19:42 This code is to do with the additive pump itself, so if the pump is faulty it may be injecting too much additive into the fuel, but this is likely to be a separate issue to the white smoke.
As you said, the pump may be injecting too much additive into the fuel. Are you absolutely sure that the Eolys fault is not related to the smoke? Couldn't it develop a problem and suddenly inject a lot of fluid into the fuel tank, causing it to be burning with the diesel?

Thanks.
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Re: P1445 Error - Quantity of additive too high on 2006 Citroen C5

Post by GiveMeABreak »

I think you may need to get some live data on the injection system, ideally using Lexia, so you can see what the injection system is reporting as far as the additive data is concerned.
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Marc
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Re: P1445 Error - Quantity of additive too high on 2006 Citroen C5

Post by LeoBenz »

Hello, everyone. I can say the problem "solved itself".

Basically, everytime the battery is disconnected for a while, the car tests some functions upon reconnecting it. One of these functions is precisely the Eolys Injection system. The car was parked for quite some time and I sometimes disconnected the battery in order to save it from going bad.

I connected the battery and let the car idle for some time and the quantity of smoke slowly reduced. After 5 minutes or so, the emissions were normal. After that, no more white smoke.

Thanks everyone for the tips.
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Re: P1445 Error - Quantity of additive too high on 2006 Citroen C5

Post by Pete_D60 »

Hi All,

Ran a scan on the Dogmobile and got a new fault of P1445 on my Topdon ArtiDiag800BT as below:
IMG_0093.png
Pretty sure this is a calculated DTC based on a countdown where the value has reached zero as per this YT video from O’Rileys Autos:



I managed to clear it through the maintenance and service functions on the Topdon after confirming the live data showed that the DPF differential pressure was <5mBar at tickover and didn’t go above 50mBar at around 3000 rpm.

So if you get this fault, hopefully this may help you.
Occasionally, I actually understand what I’m doing, however, now is not one of those times! #-o
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GiveMeABreak
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Re: P1445 Error - Quantity of additive too high on 2006 Citroen C5

Post by GiveMeABreak »

It is a calculated value and is undertaken by the engine ECU, which records the dosing amounts of additive injected into the fuel tank over time. Because the additive contains a Cerine compound which cannot be burned off during regeneration, along with carbon and engine debris / ash, it calculates the amount of cerine that has been deposited. When it thinks the the pre-configured amount in grammes has been reached, it will flag the warning that the particle filter is at end of life.

At this stage the filter should be deep cleaned or replaced, then when the engine ECU has been told of the replacement, it will start all over again. So as your vehicle is at 110k miles, it will be getting pretty close to this point and that's likely why it has flagged the warning up.

As the DPF starts regenerating more quickly at lesser mileages, this may be because it is getting blocked more quickly. The differential pressure sensors monitor this as a safety check, but just be aware the that at 70% blockage, it becomes more difficult to regenerate, until it can no longer do so. You'll then get limp home mode activated at some point and further faults.
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Marc
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Re: P1445 Error - Quantity of additive too high on 2006 Citroen C5

Post by Pete_D60 »

Thanks for the clarification Marc, I’ll put the DPF clean on my “To Do” list! :wink:
Occasionally, I actually understand what I’m doing, however, now is not one of those times! #-o