P0455 on Buick Enclave: Symptoms, Causes & DIY Fix
Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting Buick Enclave vehicles equipped with 3.6L V6 (310HP) / 2.5L Turbo 4-Cyl (328HP).
1. Symptoms of P0455 on Buick Enclave
When the Engine Control Module (ECM/PCM) on your Buick Enclave (3.6L V6 (310HP) / 2.5L Turbo 4-Cyl (328HP)) logs fault code P0455, drivers commonly observe:
2. Most Likely Causes on Buick Enclave
Historical warranty claims and technical repair bulletins for Buick Enclave point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Buick Enclave
Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the Buick Enclave equipped with 3.6L V6 (310HP) / 2.5L Turbo 4-Cyl (328HP).
If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the Buick Enclave equipped with 3.6L V6 (310HP) / 2.5L Turbo 4-Cyl (328HP).
Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the Buick Enclave equipped with 3.6L V6 (310HP) / 2.5L Turbo 4-Cyl (328HP).
Check vent valve for road salt corrosion or spider nest clogs. on the Buick Enclave equipped with 3.6L V6 (310HP) / 2.5L Turbo 4-Cyl (328HP).
Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the Buick Enclave equipped with 3.6L V6 (310HP) / 2.5L Turbo 4-Cyl (328HP).
4. Buick Enclave P0455 FAQs
What causes code P0455 to trigger on a Buick Enclave?
On the Buick Enclave (3.6L V6 (310HP) / 2.5L Turbo 4-Cyl (328HP)), 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 Buick Enclave with code P0455?
Yes. Completely safe to drive, but emissions test will fail. Given that P0455 carries a Low severity rating on Buick vehicles, we advise performing diagnostic scanning via the OBD-II port located driver lower knee bolster panel before extended highway driving.
Where is the diagnostic port located on the Buick Enclave?
The 16-pin OBD-II DLC connector on the Buick Enclave is situated driver lower knee bolster panel. It requires no special tools to plug in a standard scanner.
How much does it cost to fix P0455 on a Buick Enclave?
DIY replacement parts typically range between $15 - $250 (DIY: $15 - $50). If serviced at an authorized Buick dealership, expect an additional $120–$250 in professional labor based on their $115/hr hourly rate.