P0455 on BMW M5: Symptoms, Causes & DIY Fix
Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting BMW M5 vehicles equipped with 4.4L Twin-Turbo V8 M HYBRID (717HP / 738 lb-ft torque).
1. Symptoms of P0455 on BMW M5
When the Engine Control Module (ECM/PCM) on your BMW M5 (4.4L Twin-Turbo V8 M HYBRID (717HP / 738 lb-ft torque)) logs fault code P0455, drivers commonly observe:
2. Most Likely Causes on BMW M5
Historical warranty claims and technical repair bulletins for BMW M5 point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for BMW M5
Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the BMW M5 equipped with 4.4L Twin-Turbo V8 M HYBRID (717HP / 738 lb-ft torque).
If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the BMW M5 equipped with 4.4L Twin-Turbo V8 M HYBRID (717HP / 738 lb-ft torque).
Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the BMW M5 equipped with 4.4L Twin-Turbo V8 M HYBRID (717HP / 738 lb-ft torque).
Check vent valve for road salt corrosion or spider nest clogs. on the BMW M5 equipped with 4.4L Twin-Turbo V8 M HYBRID (717HP / 738 lb-ft torque).
Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the BMW M5 equipped with 4.4L Twin-Turbo V8 M HYBRID (717HP / 738 lb-ft torque).
4. BMW M5 P0455 FAQs
What causes code P0455 to trigger on a BMW M5?
On the BMW M5 (4.4L Twin-Turbo V8 M HYBRID (717HP / 738 lb-ft torque)), 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 BMW M5 with code P0455?
Yes. Completely safe to drive, but emissions test will fail. Given that P0455 carries a Low severity rating on BMW vehicles, we advise performing diagnostic scanning via the OBD-II port located driver lower footwell assembly before extended highway driving.
Where is the diagnostic port located on the BMW M5?
The 16-pin OBD-II DLC connector on the BMW M5 is situated driver lower footwell assembly. It requires no special tools to plug in a standard scanner.
How much does it cost to fix P0455 on a BMW M5?
DIY replacement parts typically range between $15 - $250 (DIY: $15 - $50). If serviced at an authorized BMW dealership, expect an additional $120–$250 in professional labor based on their $175/hr hourly rate.