The most frequently mentioned issue when buying a used Mercedes-Benz GLA 180d DCT 2020: Electrical anomalies: fuse/control unit (failure to operate). Additionally, SCR / AdBlue system faults are also commonly reported.
Be cautious
Most reported issue: Electrical anomalies: fuse/control unit (failure to operate). Service history and a test drive matter.
Listed from most frequently reported, each with its source.
In some vehicles with the OM654 engine control unit, non-starting conditions are reported due to electrical issues related to fuses (e.g., blown fuse F152) or faults requiring intervention in the control unit.
Electrical
The complex exhaust aftertreatment system (SCR + AdBlue dosing + NOx sensors) can develop issues such as out-of-tolerance NOx sensors, AdBlue dosing problems, or selective catalytic component failures.
Exhaust Emissions
In the OM654 2.0 diesel, the DPF can clog, especially with city or short-distance driving. Automatic regenerations may not complete, leading to warning lights, power loss, and the need for forced regeneration.
Exhaust Emissions
The EGR system in the OM654 engine can accumulate carbon deposits that may clog the actuator or passage channels, especially with city driving and short trips. A clogged or faulty EGR valve manifests as a lit warning light, rough running, and performance loss.
Exhaust Emissions
Modern common-rail systems and injectors, especially the piezoelectric versions used in the OM654 engine, can be sensitive to fuel quality and may lead to rough running, power loss, or faults requiring intervention.
Fuel System
Same trim, different year
We only publish claims we can verify. Cards come from European fault records and owner reports matched to this vehicle on brand, fuel, engine and generation.