MajorCommonEngine

Citroen C5: AdBlue/SCR system crystallisation and pump failure (2.0 BlueHDi, C5 Aircross)

AdBlue/SCR system crystallisation and pump failure (2.0 BlueHDi, C5 Aircross) is a common engine fault on the Citroen C5 on the 2019 onward cars, and we rate it major. Putting it right costs $700 to $3,000 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 15 documented faults on the Citroen C5.

Vehicle: Citroen C5
Engine: 2.0L
Years: 2019 onward
Fuel: diesel
System: Engine

This page covers the Citroen C5 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Citroen C5 faults15 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Fuel injector yet. We would rather show none than show a picture of a different part.

What goes wrong

Diesel C5 Aircross models carry an AdBlue emissions system whose injector and in-tank pump clog with urea crystals, typically at 80,000-120,000 km and sooner on low-use vans-and-school-runs duty. The car warns 'AdBlue fault - starting prevented in X km' and will genuinely refuse to restart once the countdown expires. An injector is a moderate job; the complete tank/pump assembly is the expensive outcome. Some owners have had entire systems replaced under goodwill - paperwork proving that is valuable.

What you would notice

AdBlue or emissions fault warning with a restart countdown
Engine warning light after AdBlue refill
White crystal deposits around the AdBlue injector
Reduced performance mode

How to check it

Where to look. AdBlue tank and pump under the rear of the vehicle (filler next to fuel cap); injector on the exhaust SCR unit

Check the dash for any AdBlue or emissions message and ask to see the AdBlue refill history.
A scan will show SCR/NOx fault codes even if the light is currently off.
Ask specifically whether the AdBlue tank, pump or injector have been replaced and whether any work was goodwill-funded.

Parts involved: Fuel injector.

What it costs to put right

$700 to $3,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the AdBlue system ever shown a fault or countdown message?”
“Has the tank, pump or injector been replaced?”
“How often is AdBlue topped up and where?”

Now check the Citroen C5 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in the sources below. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them.

Fastlane AdBlue Solutions - Citroen C5 Aircross AdBlue problems (BlueHDi NOx/SCR)
French Car Forum thread 'C5 Aircross Adblue Issue'
Peugeot Forums BlueHDi AdBlue fault threads (same PSA system)

Citroen C5 buyer questions

Is adblue/scr system crystallisation and pump failure (2.0 bluehdi, c5 aircross) serious on a Citroen C5?

We rate it major and common on the Citroen C5. Diesel C5 Aircross models carry an AdBlue emissions system whose injector and in-tank pump clog with urea crystals, typically at 80,000-120,000 km and sooner on low-use vans-and-school-runs duty. The car warns 'AdBlue fault - starting prevented in X km' and will genuinely refuse to restart once the countdown expires. An injector is a moderate job; the complete tank/pump assembly is the expensive outcome. Some owners have had entire systems replaced under goodwill - paperwork proving that is valuable.

How much does it cost to fix on a Citroen C5?

$700 to $3,000 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Citroen C5 years are affected?

Our research records this fault on the 2019 onward Citroen C5. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Check the dash for any AdBlue or emissions message and ask to see the AdBlue refill history. A scan will show SCR/NOx fault codes even if the light is currently off. Ask specifically whether the AdBlue tank, pump or injector have been replaced and whether any work was goodwill-funded. Look here: AdBlue tank and pump under the rear of the vehicle (filler next to fuel cap); injector on the exhaust SCR unit