Skip to content
MotorFiable

PSA/Ford 2.0 HDi, BlueHDi and TDCi (DW10)Urgency: Garage soon

AdBlue system warning in the 2.0 HDi engine: causes

In the 2.0 HDi engine, 1 documented fault may be the cause: AdBlue tank crystallisation and failures (BlueHDi).[1]

What to do now

Garage soon

If the tank is full and the warning persists, the problem lies with the system. Go to a garage before the countdown ends and keep your receipts in case the fault is covered by a manufacturer campaign.

What it means

Diesels with selective catalytic reduction (SCR) use AdBlue to cut NOx emissions. A warning with a countdown ("engine will not restart in X km") indicates a low level or a fault in the AdBlue tank, pump, heater or injector. When the countdown reaches zero, the car will not start again.

AdBlue warning: causes in all cars

11 sourcesHow we work

Engine faults that cause it

From most to least important. Under each fault, how the symptom shows up. Check the affected years and versions on each page.

  1. Source for the symptom[1]

How much it can cost

Depending on the cause, repair at an independent garage ranges from €800[1][2][3] (AdBlue tank crystallisation and failures (BlueHDi)) to €1,200[1][2][3] (AdBlue tank crystallisation and failures (BlueHDi)), including VAT.

Most serious fault among the possible causes: Medium severity

Other common causes: adBlue warning

Besides the documented faults of the 2.0 HDi, these are the most common causes on any car according to the sources.

  • Low AdBlue level[4][5][6]Common
  • Urea crystals in the injector, the lines or the tank[4][6][7]Common
  • Faulty pump, heater or tank[6][7]Possible
  • Faulty level or NOx sensors[5][6][7]Possible
  • Dosing fault due to low pressure in the system[8]Possible
  • Factory-defective AdBlue tank on Peugeot, Citroën, DS and Opel diesels[1][9][10]Possible

What to check first

  1. Note the message that appears and, if there is a countdown, the kilometres it shows: the warning starts in yellow or orange and becomes more insistent as they drop.[4][5]
  2. Check that AdBlue really is low and top up with approved product (ISO 22241 standard). Never put it in the fuel tank.[5][7]
  3. After topping up, wait a few minutes, switch the ignition on several times or start the engine and drive for a while. If the level was very low, add enough: with less than 4 or 5 litres the sensor may not register the change.[4][5][6][11]
  4. If the warning stays on, or there is a countdown with the tank full, ask for a diagnosis with code reading before it reaches zero. Do not tamper with or disable the system.[5][8]
Complete guide: adBlue system warning

Cars with the 2.0 HDi engine

Open yours to see only the faults that affect it according to its years and versions.

Frequently asked questions

AdBlue warning in the 2.0 HDi: what could it be?

In the 2.0 HDi engine, 1 documented fault may be the cause: AdBlue tank crystallisation and failures (BlueHDi). Each fault has its own page with the affected years and versions, the cause and how to check for it.

AdBlue warning in the 2.0 HDi: is it serious?

Urgency: garage soon. If the tank is full and the warning persists, the problem lies with the system. Go to a garage before the countdown ends and keep your receipts in case the fault is covered by a manufacturer campaign. The most serious fault that causes it on this engine has medium severity.

AdBlue warning in the 2.0 HDi: how much does it cost to fix?

It depends on the cause: at an independent garage, from €800 (AdBlue tank crystallisation and failures (BlueHDi)) to €1,200 (AdBlue tank crystallisation and failures (BlueHDi)), including VAT.

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. El fallo que afecta a cientos de coches y que ahora la OCU denuncia para reclamar indemnizacionesAutopista · Motoring press · published 29 May 2023 · consulted 27 September 2026 · in Spanish
  2. Más problemas para Stellantis: ahora tendrá que indemnizar también a los afectados por el AdBlueAutopista · Motoring press · published 30 December 2024 · consulted 27 September 2026 · in Spanish
  3. Aditivo AdBlue: qué debes usar para evitar una reparación de 2.000 euros en tu coche diéselAutopista · Motoring press · published 1 April 2026 · consulted 27 September 2026 · in Spanish
  4. Aviso de AdBlue encendido, qué hacer y cómo rellenarloAutopista · Motoring press · published 26 June 2026 · consulted 4 October 2026 · in Spanish
  5. ¿Se puede resetear el fallo AdBlue sin máquina de diagnosis? Riesgos y alternativasAutopista · Motoring press · published 16 April 2026 · consulted 4 October 2026 · in Spanish
  6. El pequeño aviso que algunos conductores de diésel se saltan porque «aún quedan 2.000 km»: ignorarlo puede ser un carísimo errorMotorpasión · Motoring press · published 12 March 2026 · consulted 4 October 2026 · in Spanish
  7. Qué es un catalizador SCR: funcionamiento, AdBlue y mantenimientoRACE · Motoring press · published 23 September 2026 · consulted 4 October 2026 · in Spanish
  8. SSM72610 - DTC P20E8 - Reductant pressure too low - signal above allowable rangeJaguar Land Rover · Manufacturer · published 29 January 2016 · consulted 4 October 2026
  9. Stellantis crea una plataforma para los afectados por los motores Puretech y depósitos AdBlue: ¿qué debo hacer?El Español · General press · published 21 January 2025 · consulted 4 October 2026 · in Spanish
  10. Los coches más afectados por las averías de AdBlue en el mercado actualAutofácil · Motoring press · published 22 June 2026 · consulted 4 October 2026 · in Spanish
  11. ¿Qué es el AdBlue? Todo lo que necesitas saberRepsol · Other source · published 14 November 2024 · consulted 4 October 2026 · in Spanish