P0400 — Exhaust Gas Recirculation Flow
General EGR flow malfunction detected.
2+
Affected Brands
4+
ECU Platforms
2
Related Services
6
Related DTCs
Symptoms
What the driver typically experiences when P0400 is stored
Why does P0400 appear after tuning?
Appears when EGR flow monitoring detects unexpected behavior after EGR modification.
How proper calibration can address P0400
WEREMAP EGR calibrations address all flow monitoring parameters for the specific ECU platform.
Related Diagnostic Codes
Codes from the same diagnostic system as P0400
Exhaust Gas Recirculation (EGR) Control Circuit
Exhaust Gas Recirculation (EGR) Flow Insufficient
EGR Position Sensor Circuit Low
Diagnostic Trouble Code P0409
Diagnostic Trouble Code P0404
Diagnostic Trouble Code P0402
Affected ECU Platforms
Commonly Affected Vehicles
Based on data from 2+ vehicle brands. P0400 is not limited to these models.
Frequently Asked Questions
What does P0400 mean?â–¼
Why does P0400 appear after ECU tuning?â–¼
How do you prevent P0400 during remapping?â–¼
Which vehicles are affected by P0400?â–¼
What other codes appear alongside P0400?â–¼
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