P0455 on Mercedes-Benz GLC: Fix & DLC Location
Factory diagnostic troubleshooting wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically on the Mercedes-Benz GLC (2020–2026, 2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC).
1. Symptoms of P0455 on Mercedes-Benz GLC
When the Engine Control Module (ECM/PCM) on your Mercedes-Benz GLC (2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC) logs fault code P0455, drivers commonly observe:
2. Most Likely Causes on Mercedes-Benz GLC
Historical warranty claims and technical repair bulletins for Mercedes-Benz GLC point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Mercedes-Benz GLC
Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the Mercedes-Benz GLC equipped with 2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC.
If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the Mercedes-Benz GLC equipped with 2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC.
Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the Mercedes-Benz GLC equipped with 2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC.
Check vent valve for road salt corrosion or spider nest clogs. on the Mercedes-Benz GLC equipped with 2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC.
Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the Mercedes-Benz GLC equipped with 2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC.
Other Common Fault Codes on Mercedes-Benz GLC
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Mercedes-Benz GLC:
4. Mercedes-Benz GLC P0455 FAQs
What causes code P0455 to trigger on a Mercedes-Benz GLC?
On the Mercedes-Benz GLC (2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC), P0455 is most frequently caused by Missing, loose, or cracked gas cap seal or Faulty EVAP purge control solenoid.
Where is the OBD-II port located on my Mercedes-Benz GLC?
On the Mercedes-Benz GLC, the 16-pin DLC diagnostic connector is located Driver lower kick panel near hood release lever. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my Mercedes-Benz GLC with code P0455?
Yes. Completely safe to drive, but emissions test will fail. Given that P0455 carries a Low severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.