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 P3018 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
- Step 1: Connect an OBD-II scanner and read DTCs to confirm P3018
DTC P3018 present with freeze frame data - Step 2: Inspect wiring and connectors in the affected circuit for damage, corrosion, or loose pins
Wiring intact, connectors clean and seated - Step 3: Perform component-level testing per manufacturer service manual
Component values within spec or component confirmed faulty - 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 P3018 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 P3018?
Limited driving is possible, but the affected system may not operate correctly. Have the vehicle diagnosed promptly to prevent potential damage.
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Source: SAE J2012 Mercedes-Benz Manufacturer-Specific Supplemental DTC
Category: OBD-II
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