Code Definition

P1401 — Fuel tank leakage diagnostic module fault

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

About P1401

P1401 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.

P1401 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 fuel tank leakage diagnostic module is part of the evaporative emission (EVAP) system and is used by the Engine Control Module to test the fuel tank and EVAP plumbing for leaks. Depending on the model it applies a controlled pressure or vacuum to the sealed system and reports back whether the system holds, allowing the ECM to detect leaks down to a small specified size. DTC P1401 is set on Hyundai and Kia vehicles when the ECM detects a fault in this leakage diagnostic module or its control and feedback circuit, such as an electrical fault, no response, or an implausible result during the ...

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