AutoCodes – Hyundai – P1401 Hyundai

P1401 Hyundai Code - DMTL Performance

Quick Answer

The heated DMTL (Diagnostic Module Tank Leakage) is used to monitor the evaporative system for leaks. Common causes include Faulty Diagnostic Module Tank Leakage (DMTL), Diagnostic Module Tank Leakage harness is open or shorted, Diagnostic Module Tank Leakage circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1401 Hyundai indicates DMTL Performance.
Common causes: Common causes include Faulty Diagnostic Module Tank Leakage (DMTL), Diagnostic Module Tank Leakage harness is open or shorted, Diagnostic Module Tank Leakage circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 25,127

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 18, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1401 Hyundai Description

The heated DMTL (Diagnostic Module Tank Leakage) is used to monitor the evaporative system for leaks. The diagnostic module consists of an air filter, an heating element, an electrical driven air pump, a change-over valve. In switched off condition the fuel tank breathes through the canister, the changeover valve and the air filter. For purging the canister, the purge control valve is opened and fresh air-flows via air filter, changeover valve and canister into the intake manifold.

OBDII Code P1401 Hyundai - DMTL Performance - AutoCodes.com — P1401 Hyundai Code - DMTL Performance

What does this mean?

What are the Possible Causes of the DTC P1401 Hyundai?

Faulty Diagnostic Module Tank Leakage (DMTL)
Diagnostic Module Tank Leakage harness is open or shorted
Diagnostic Module Tank Leakage circuit poor electrical connection

How to Fix the DTC P1401 Hyundai?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1401 Hyundai code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.