The most common Mercedes diesel of the last decade (C, E, Sprinter, Vito). Known for Delphi injection issues, timing chain wear, and VGT turbo problems.
Click a code for the full breakdown: symptoms, causes, and whether you can keep driving.
Turbocharger Underboost
The turbo is producing less boost pressure than the ECU requests.
Fuel Rail/System Pressure Too Low
Measured fuel pressure is below what the ECU commands - the engine may be starved of fuel under load.
Fuel Pressure Regulator Control Circuit Low
The electrical circuit controlling the fuel pressure regulator (fuel metering valve) shows low voltage - a wiring or valve fault.
Glow Plug Module Control Circuit (Diesel)
The control circuit of the diesel glow plug module has a fault.
Diesel Particulate Filter Efficiency Below Threshold
The DPF is not trapping soot as it should - it may be damaged, removed, or overloaded.
Turbocharger Overboost Condition
Boost pressure exceeded the safe limit - the wastegate or boost control is not relieving pressure.
System Voltage Low
The ECU sees battery/system voltage below normal while the engine runs.
Lost Communication With ECM/PCM
Other modules on the CAN network cannot communicate with the engine control module.
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