Mercedes-Benz OBD-II Error Code P3014

Mercedes-Benz OBD-II Major Powertrain - Fuel/Air

Model: OBD-II | Code: P3014

Applicable Systems
A-Class C-Class E-Class S-Class GLC GLE

Symptoms

The Mercedes-Benz powertrain control module has detected a manufacturer-specific fuel system injector circuit fault. The check engine light is on. DTC P3014 is stored.

Possible Causes

  • Manufacturer-specific fuel system injector circuit component failure
  • Wiring or connector fault in the affected circuit
  • Control module software calibration issue
  • Sensor or actuator out of specification

Troubleshooting Steps

  1. Step 1: Connect an OBD-II scanner and read DTCs to confirm P3014
    DTC P3014 present with freeze frame data
  2. Step 2: Inspect wiring and connectors in the affected circuit for damage, corrosion, or loose pins
    Wiring intact, connectors clean and seated
  3. Step 3: Perform component-level testing per manufacturer service manual
    Component values within spec or component confirmed faulty
  4. Step 4: Repair or replace the faulty component, clear DTC, and verify no return
    DTC cleared and does not return after a road test

How to Reset

Clear the DTC after repair using a diagnostic scanner. The code clears automatically if the fault is not detected for 3 consecutive drive cycles.

Common Replacement Parts

  • varies: Replace the confirmed faulty fuel system injector circuit component (Confirm part number via VIN at a Mercedes-Benz dealership)

Frequently Asked Questions

  • Q: What does P3014 mean?

    This manufacturer-specific DTC indicates a powertrain - fuel/air system fault. Refer to the vehicle's service manual for the exact diagnostic procedure.

  • Q: Can I drive with P3014?

    Limited driving is possible, but the affected system may not operate correctly. Have the vehicle diagnosed promptly to prevent potential damage.

Related Mercedes-Benz Fault Codes

Source: SAE J2012 Mercedes-Benz Manufacturer-Specific Supplemental DTC

Category: OBD-II