AdBlue system incidents occur on Mercedes Trucks & Bus vehicles when one of the components of the emission control system fails, such as pump, injector, catalytic converter, NOx sensor, clogged particulate filter, impossible regeneration and more.

These faults, when interpreted by the engine ECU, reduce torque, power and sometimes even the maximum speed possible with the vehicle (20km/h). We'll explain how we resolve these faults and help you out.

Every Euro 6 truck, machine or bus is equipped with two modules. The MCM (Motor Control Module) and the ACM (AfterTreatment Control Module). These two units are closely linked and communicate with each other via a network we call the CAN network.

When a component of the anti-pollution system controlled by the ACM enters a fault condition (error due to a faulty sensor, gauge, clogged cat, pressure fault, etc.), the latter sends a message to the ACM, which manages its operation. If the value expected by the ACM differs from the value received, the ACM also sends a message to the MCM, which translates it into a fault code and a message to the instrument panel. Depending on the severity of the fault, the vehicle can either continue on its way unhindered, or have its torque and power reduced, and if the fault is critical, in which case the maximum authorized speed can be reduced to 20km/h, which we call Limp Mode.

As explained above, the vehicle is equipped with 2 ACM and MCM boxes. They both look identical to the naked eye, but you mustn't confuse them, as they have different pin-outs for the PINS connectors. We're going to have to read the data present in the two ECUs in order to extract the data and be able to modify the necessary parameters.

We have 2 ways of intervening on your vehicle, either directly via memory readout of ACM and MCM data, or via data emulation. The two different modes of intervention each offer their own advantages and disadvantages, see below.

Suppression of Mercedes Adblue system by live reading of ACM and MCM information on the vehicle