P0455 on Nissan Altima: Symptoms, Causes & DIY Fix
Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting Nissan Altima vehicles equipped with 2.5L 4-Cyl (188HP) / 2.0L Variable Compression Turbo (248HP).
1. Symptoms of P0455 on Nissan Altima
When the Engine Control Module (ECM/PCM) on your Nissan Altima (2.5L 4-Cyl (188HP) / 2.0L Variable Compression Turbo (248HP)) logs fault code P0455, drivers commonly observe:
2. Most Likely Causes on Nissan Altima
Historical warranty claims and technical repair bulletins for Nissan Altima point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Nissan Altima
Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the Nissan Altima equipped with 2.5L 4-Cyl (188HP) / 2.0L Variable Compression Turbo (248HP).
If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the Nissan Altima equipped with 2.5L 4-Cyl (188HP) / 2.0L Variable Compression Turbo (248HP).
Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the Nissan Altima equipped with 2.5L 4-Cyl (188HP) / 2.0L Variable Compression Turbo (248HP).
Check vent valve for road salt corrosion or spider nest clogs. on the Nissan Altima equipped with 2.5L 4-Cyl (188HP) / 2.0L Variable Compression Turbo (248HP).
Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the Nissan Altima equipped with 2.5L 4-Cyl (188HP) / 2.0L Variable Compression Turbo (248HP).
4. Nissan Altima P0455 FAQs
What causes code P0455 to trigger on a Nissan Altima?
On the Nissan Altima (2.5L 4-Cyl (188HP) / 2.0L Variable Compression Turbo (248HP)), 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 Nissan Altima with code P0455?
Yes. Completely safe to drive, but emissions test will fail. Given that P0455 carries a Low severity rating on Nissan vehicles, we advise performing diagnostic scanning via the OBD-II port located under driver side dashboard to the right of hood release before extended highway driving.
Where is the diagnostic port located on the Nissan Altima?
The 16-pin OBD-II DLC connector on the Nissan Altima is situated under driver side dashboard to the right of hood release. It requires no special tools to plug in a standard scanner.
How much does it cost to fix P0455 on a Nissan Altima?
DIY replacement parts typically range between $15 - $250 (DIY: $15 - $50). If serviced at an authorized Nissan dealership, expect an additional $120–$250 in professional labor based on their $110/hr hourly rate.