DTC P0401 — Exhaust Gas Recirculation (EGR / AGR) Subsystem Calibration Guide
Technical Cause: Insufficient/excessive EGR mass airflow deviation, cooler bypass valve or position potentiometer circuit fault.
Recommended Softechpro Module: EGR Hysteresis Off + DTC Off
Supported across Bosch EDC15/16/17/MD1/MG1/MED17, Continental SID/SIMOS/PCR, Delphi DCM/CRD, Marelli, Denso & 24V heavy-duty ECUs with built-in checksum verification.
TECHNICAL FAQ
Engineering & Licensing Questions
Does Softechpro Solutions disable P0401 cleanly without breaking other diagnostics?
Yes. Softechpro Solutions v2.0.6 parses the exact manufacturer fault-code and switch tables inside your 100% virgin binary so only P0401 / EGR Hysteresis Off + DTC Off is deactivated while all other engine protections remain active.