Code Definition

P1400 — Exhasut Gas Recirculation system monitor fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Hyundai

About P1400

P1400 is a manufacturer-specific powertrain diagnostic trouble code recorded for Hyundai vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1400 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Exhaust Gas Recirculation (EGR) system routes a metered amount of inert exhaust gas back into the intake to lower combustion temperatures and reduce oxides of nitrogen. The Engine Control Module runs an EGR system monitor that commands the EGR valve and confirms the expected change in flow, manifold pressure, or air mass actually occurs. DTC P1400 is set on Hyundai and Kia vehicles when this monitor detects abnormal EGR behaviour, such as too little or too much flow, or an implausible response when the valve is commanded. Symptoms can include a rough idle, light detonation or knock under l...

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