P0455 on Honda Civic: Symptoms, Causes & DIY Fix
Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting Honda Civic vehicles equipped with 2.0L i-VTEC (158HP) / 1.5L Turbo (180HP) / Civic Type R (315HP) / Hybrid.
1. Symptoms of P0455 on Honda Civic
When the Engine Control Module (ECM/PCM) on your Honda Civic (2.0L i-VTEC (158HP) / 1.5L Turbo (180HP) / Civic Type R (315HP) / Hybrid) logs fault code P0455, drivers commonly observe:
2. Most Likely Causes on Honda Civic
Historical warranty claims and technical repair bulletins for Honda Civic point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Honda Civic
Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the Honda Civic equipped with 2.0L i-VTEC (158HP) / 1.5L Turbo (180HP) / Civic Type R (315HP) / Hybrid.
If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the Honda Civic equipped with 2.0L i-VTEC (158HP) / 1.5L Turbo (180HP) / Civic Type R (315HP) / Hybrid.
Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the Honda Civic equipped with 2.0L i-VTEC (158HP) / 1.5L Turbo (180HP) / Civic Type R (315HP) / Hybrid.
Check vent valve for road salt corrosion or spider nest clogs. on the Honda Civic equipped with 2.0L i-VTEC (158HP) / 1.5L Turbo (180HP) / Civic Type R (315HP) / Hybrid.
Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the Honda Civic equipped with 2.0L i-VTEC (158HP) / 1.5L Turbo (180HP) / Civic Type R (315HP) / Hybrid.
4. Honda Civic P0455 FAQs
What causes code P0455 to trigger on a Honda Civic?
On the Honda Civic (2.0L i-VTEC (158HP) / 1.5L Turbo (180HP) / Civic Type R (315HP) / Hybrid), 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 Honda Civic with code P0455?
Yes. Completely safe to drive, but emissions test will fail. Given that P0455 carries a Low severity rating on Honda vehicles, we advise performing diagnostic scanning via the OBD-II port located under driver dash, right side of steering column before extended highway driving.
Where is the diagnostic port located on the Honda Civic?
The 16-pin OBD-II DLC connector on the Honda Civic is situated under driver dash, right side of steering column. It requires no special tools to plug in a standard scanner.
How much does it cost to fix P0455 on a Honda Civic?
DIY replacement parts typically range between $15 - $250 (DIY: $15 - $50). If serviced at an authorized Honda dealership, expect an additional $120–$250 in professional labor based on their $115/hr hourly rate.