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P0455

Mercedes-Benz GLC GuideLow Severity

P0455 on Mercedes-Benz GLC: Symptoms, Causes & DIY Fix

Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting Mercedes-Benz GLC vehicles equipped with 2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC.

DIY Parts Estimate

$15 - $250 (DIY: $15 - $50)

GLC Direct Fit

Shop Labor Quote

$180 – $380

Based on $185/hr labor

Drivability Status

Drivable (Short Trip)

Low urgency level

Est. DIY Time

45 – 90 Min

Basic hand tools

Check P0455 On Another Mercedes-Benz Model:

Mercedes-Benz C-Class Mercedes-Benz E-Class Mercedes-Benz S-Class Mercedes-Benz GLC Mercedes-Benz GLE Mercedes-Benz GLS Mercedes-Benz G-Class

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:

Check Engine Light on on Mercedes-Benz GLC (2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC)

Gas cap loose warning message on dashboard on Mercedes-Benz GLC (2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC)

Slight fuel vapor odor near rear of vehicle on Mercedes-Benz GLC (2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC)

Mercedes-Benz GLC OBD-II Port Location

The 16-pin diagnostic connector is located Driver lower kick panel near hood release lever. Plug in your scan tool to verify freeze-frame sensor values.

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:

55%

Missing, loose, or cracked gas cap seal (Mercedes-Benz OEM Part)

25%

Faulty EVAP purge control solenoid (Mercedes-Benz OEM Part)

12%

Stuck open EVAP vent valve (Mercedes-Benz OEM Part)

Cracked EVAP charcoal canister vapor hose (Mercedes-Benz OEM Part)

3. Step-by-Step DIY Repair Guide for Mercedes-Benz GLC

Inspect and Tighten the Gas Cap

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.

Required Tool: None

Replace Gas Cap with OEM Replacement

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.

Required Tool: New OEM Gas Cap

Test EVAP Purge Solenoid Under Hood

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.

Required Tool: 12V Probe, Vacuum Pump

Inspect EVAP Canister Vent Valve Near Gas Tank

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.

Required Tool: Flashlight, Jack Stands

Smoke Test EVAP System

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.

Required Tool: EVAP Smoke Machine

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. Factory sensor degradation or wiring harness wear near the engine bay are common factors.

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 on Mercedes-Benz vehicles, we advise performing diagnostic scanning via the OBD-II port located driver lower kick panel near hood release lever before extended highway driving.

Where is the diagnostic port located on the Mercedes-Benz GLC?

The 16-pin OBD-II DLC connector on the Mercedes-Benz GLC is situated driver lower kick panel near hood release lever. It requires no special tools to plug in a standard scanner.

How much does it cost to fix P0455 on a Mercedes-Benz GLC?

DIY replacement parts typically range between $15 - $250 (DIY: $15 - $50). If serviced at an authorized Mercedes-Benz dealership, expect an additional $120–$250 in professional labor based on their $185/hr hourly rate.