P0455 on Mercedes-Benz: 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 vehicles (C-Class, E-Class, S-Class, GLC, GLE).
1. Symptoms of P0455 on Mercedes-Benz
When the Engine Control Module (ECM/PCM) on your Mercedes-Benz logs fault code P0455, drivers commonly observe:
2. Most Likely Causes on Mercedes-Benz
Historical warranty claims and technical repair bulletins for Mercedes-Benz point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Mercedes-Benz
Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on Mercedes-Benz vehicles (C-Class, E-Class).
If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on Mercedes-Benz vehicles (C-Class, E-Class).
Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on Mercedes-Benz vehicles (C-Class, E-Class).
Check vent valve for road salt corrosion or spider nest clogs. on Mercedes-Benz vehicles (C-Class, E-Class).
Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on Mercedes-Benz vehicles (C-Class, E-Class).
P0455 Guides by Mercedes-Benz Model
Select your specific Mercedes-Benz model below for exact OBD-II DLC port locations, wiring diagrams, and engine displacement specs:
Other Common Diagnostic Codes on Mercedes-Benz
Troubleshoot other high-frequency Check Engine Light fault codes reported across Mercedes-Benz vehicles:
4. Mercedes-Benz P0455 FAQs
What causes code P0455 to trigger on a Mercedes-Benz?
On Mercedes-Benz vehicles, 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 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 before extended driving.
How much does it cost to fix P0455 on a Mercedes-Benz?
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.