Resetting the AdBlue light on Opel

On diesel Opel models such as the Corsa, Crossland, Vivaro, or Grandland, an AdBlue warning light may illuminate on the dashboard. This indicator can be accompanied by the message "Starting impossible in XXX km".

What does this message mean?

Why does it appear?

How can you turn off the AdBlue warning light?

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What does the AdBlue warning light look like on Opel?

To locate the AdBlue warning light, also called UREA, on your Opel, check your dashboard. In most models, it is located near the speedometer, the tachometer, or in the centre of the multifunction screen if available.

This warning light is represented by a yellow/orange pictogram showing wavy lines topped with a cloud and two droplets.

Depending on the year and model of your Opel, a warning message may also appear, such as: "Add AdBlue: Starting impossible in ... km", which may or may not be accompanied by an audible signal.

If in doubt, it is recommended to consult your vehicle's maintenance manual to understand the exact meaning of the message and the procedure to follow.

Why does the warning light come on?

Your Opel's AdBlue warning light may illuminate for various reasons, which are important to identify in order to apply the appropriate solution.

Initially, if the AdBlue warning light appears on its own, the first reflex should be to refill the AdBlue tank, which is usually located next to the fuel cap.

If the light remains on after refilling or if it is accompanied by the engine warning light, this may indicate an issue with the anti-pollution system, such as a faulty sensor, a failed AdBlue pump, or crystallisation of the liquid.

How to turn off the AdBlue warning light on Opel?

Manually turning off the AdBlue warning light

Refill the AdBlue tank: Use a liquid certified by ISO 22241 (available at service stations, from your mechanic, etc.). A non-compliant product can damage the SCR system or interfere with the urea module sensors.
Restart the vehicle: Simply restarting your vehicle after refilling the tank may be enough to turn off the warning light, as the ECU detects the new level.
Perform a driving cycle: If the warning light does not disappear, perform a normal driving cycle (a few kilometres at a steady speed). The engine ECU sometimes needs time to validate the correction of the AdBlue level.
Diagnosis and treatment: If the warning light remains on despite refilling, there may be a fault in the SCR system (sensor, pump, crystallisation, etc.). In this case, it is recommended to perform a diagnosis with a diagnostic tool.

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The warning light remains on after refilling

Liquid crystallisation: AdBlue liquid can crystallise when exposed to air or very low temperatures. These crystals can block the pipes, injector, or part of the tank, causing the SCR system to malfunction and the warning light to illuminate on the dashboard.
Injector issues: Injectors are essential for distributing the Cérine in the exhaust system, but they can become clogged due to crystallisation or impurities in the liquid.
Tank problems: Overfilling or overflowing the AdBlue tank can cause deformation due to excessive pressure or formed crystals. Over time, this can lead to tank deformation or blockage of the level sensor due to liquid crystallisation.
Blocked sensor: This sensor detects the liquid level in the tank. In case of an electronic failure or crystals blocking the measurement, it may send incorrect information to the ECU, falsely indicating that the tank is empty.
Electrical issues: Communication problems between the various system components may occur. A poor connection, corrosion, or wiring issue can interrupt communication between these elements, triggering an engine warning light or an AdBlue error message.