P0455 on Toyota Highlander: Symptoms, Causes & DIY Fix
Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting Toyota Highlander vehicles equipped with 2.4L Turbo 4-Cyl (T24A-FTS 265HP) / 3.5L V6 / 2.5L Hybrid.
1. Symptoms of P0455 on Toyota Highlander
When the Engine Control Module (ECM/PCM) on your Toyota Highlander (2.4L Turbo 4-Cyl (T24A-FTS 265HP) / 3.5L V6 / 2.5L Hybrid) logs fault code P0455, drivers commonly observe:
2. Most Likely Causes on Toyota Highlander
Historical warranty claims and technical repair bulletins for Toyota Highlander point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Toyota Highlander
Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the Toyota Highlander equipped with 2.4L Turbo 4-Cyl (T24A-FTS 265HP) / 3.5L V6 / 2.5L Hybrid.
If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the Toyota Highlander equipped with 2.4L Turbo 4-Cyl (T24A-FTS 265HP) / 3.5L V6 / 2.5L Hybrid.
Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the Toyota Highlander equipped with 2.4L Turbo 4-Cyl (T24A-FTS 265HP) / 3.5L V6 / 2.5L Hybrid.
Check vent valve for road salt corrosion or spider nest clogs. on the Toyota Highlander equipped with 2.4L Turbo 4-Cyl (T24A-FTS 265HP) / 3.5L V6 / 2.5L Hybrid.
Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the Toyota Highlander equipped with 2.4L Turbo 4-Cyl (T24A-FTS 265HP) / 3.5L V6 / 2.5L Hybrid.
4. Toyota Highlander P0455 FAQs
What causes code P0455 to trigger on a Toyota Highlander?
On the Toyota Highlander (2.4L Turbo 4-Cyl (T24A-FTS 265HP) / 3.5L V6 / 2.5L 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 Toyota Highlander with code P0455?
Yes. Completely safe to drive, but emissions test will fail. Given that P0455 carries a Low severity rating on Toyota vehicles, we advise performing diagnostic scanning via the OBD-II port located under driver steering column near kick panel before extended highway driving.
Where is the diagnostic port located on the Toyota Highlander?
The 16-pin OBD-II DLC connector on the Toyota Highlander is situated under driver steering column near kick panel. It requires no special tools to plug in a standard scanner.
How much does it cost to fix P0455 on a Toyota Highlander?
DIY replacement parts typically range between $15 - $250 (DIY: $15 - $50). If serviced at an authorized Toyota dealership, expect an additional $120–$250 in professional labor based on their $110/hr hourly rate.