P0400

Professional fix for fault code P0400

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Software fix

EGR OFF + DTC OFF

Affected system:
EGR / Exhaust Gas Recirculation

What does code P0400 mean?

Exhaust gas recirculation — flow malfunction. Generic code indicating a general EGR system problem without specifying excessive or insufficient flow.

Symptoms seen in the workshop

  • MIL on
  • Irregular performance

Common causes of code P0400

  • Carbon-clogged EGR valve
  • Electrical or pneumatic circuit issue
  • Faulty exhaust gas temperature sensor

Fix by ECU remapping

Complete EGR system deactivation.

⚠️ Important: Disabling the DTC without the correct calibration of the related system (EGR OFF + DTC OFF) is not a valid fix. Both the calibration maps and the diagnostic mask have to be modified.

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Modifications to emission control systems (EGR, DPF, AdBlue, catalyst…) are offered exclusively for competition use, off-road use or in markets where regulations allow it. The professional workshop installing the file is responsible for complying with applicable law.