Gas Recirculation Valve Man Trucks TGX

Typical Defects:
Errors in EGR butterfly position (misalignment between requested and actual position)
Butterfly blockage errors;
Actuator circuit errors
Butterfly position sensor errors;
Insufficient or excessive EGR flow errors detected by the engine ECU compared to expected values.

The exhaust gas recirculation valve with OE code 5846R518 is an electronic EGR butterfly unit used on MAN TGX Euro 6 trucks with D26 engine. It is supplied by Sonceboz as an OEM EGR actuator/butterfly for MAN and is mounted on the recirculation module (EGR radiator + valve) of the engine, where it regulates the flow of exhaust gases reintroduced into the intake.

The component integrates throttle body, electric actuator, and electronic control unit into a single die-cast aluminum block, designed to withstand high temperatures, vibrations, and contamination typical of Euro 6 industrial vehicles.

Technical specifications

• Type: electronic EGR valve.
• Manufacturer: Sonceboz.
• Application: EGR systems on MAN D26 Euro 6 engines, primarily on MAN TGX trucks.
• Power supply: 24 V DC (electrical system of industrial vehicles).
• Operation: electric actuator with reducer and integrated position sensor, managed by engine ECU or dedicated EGR control unit.
• Materials: body and flange made of high-strength aluminum alloy, throttle shaft in steel, waterproof electrical connector.

DIPA can intervene to overhaul these components thanks to its experience and expertise.

Functionality

• Regulates the opening/closing of the air/exhaust gas passage in the duct by precisely managing the amount of recirculated gas to the engine.
• Works in combination with the EGR radiator and the main recirculation valve within the MAN TGX Euro 6 EGR module.
• Collaborates with the engine ECU to meet Euro 6 emission standards, reducing NOx by increasing the fraction of inert gas in the intake.
• Performs rapid and continuous adjustments thanks to the integrated electric actuator, with feedback control via throttle position sensor.
• In some configurations, it is part of a complete EGR module supplied refurbished or new, which also includes the cooler and EGR control logic electronics.
• Interacts with other pollution control systems (SCR, DOC, DPF) ensuring a correct balance between gas recirculation and after-treatment.

Model applications

• MAN TGX Euro 6 vehicles with D26 engine.

Typical defects

• The internal butterfly gets stuck.
• The actuator is unable to provide an accurate position.
• The vehicle loses power/the engine runs irregularly.

Any associated DTC codes

On MAN TGX Euro 6, fault codes do not follow proprietary logic (SPN/FMI and specific MAN codes). Regarding the EGR valve/butterfly 5846R518, the following may occur:

• errors of EGR butterfly position (misalignment between requested and actual position);
• errors of butterfly blockage;
• errors of actuator circuit
• errors of throttle position sensor;
• errors of insufficient or excessive EGR flow detected by the engine ECU compared to expected values.

Final conclusions

The gas recirculation valve/EGR butterfly MAN OE 5846R518 is a key component of the EGR system on MAN TGX Euro 6 with D26 engine, where it plays a decisive role in compliance with emission regulations and the proper functioning of the engine. Its combined role as air/EGR butterfly and electronic actuator makes the part critical: failures often lead to emergency modes and power loss.

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