Tracking P0446 on Your 2024 BMW X5
A P0446 code on your 2024 BMW X5 (G05 LCI) signals an EVAP vent control circuit malfunction. The facelifted X5 offers the B58 3.0L turbo six (xDrive40i) or S68 4.4L twin-turbo V8 (xDrive50i/M60i). Both powertrains share the same EVAP system with DME-controlled fuel tank vent valve (FTVV) and leak diagnosis pump (LDP).
Under full BMW warranty, this is a dealer repair at zero cost. The facelifted G05 benefits from refined production, but EVAP circuit codes can occur on any new vehicle.
Symptoms Present
- Check engine light (yellow) with P0446 stored
- Fuel fill issues at the pump
- EVAP monitor incomplete
- Possible companion codes in DME
Likely Causes
- Fuel Tank Vent Valve (FTVV) Defect (High Likelihood): Manufacturing defect in the FTVV assembly. Even new vehicles can have component quality variations. Warranty-covered.
- DME Software Calibration (High Likelihood): EVAP monitoring refinements for the facelifted G05. A DME reflash is a common quick fix. Warranty-covered.
- Leak Diagnosis Pump (LDP) Issue (Medium Likelihood): Early LDP failure or calibration sensitivity on the updated platform. Warranty-covered.
- EVAP Circuit Wiring (Medium Likelihood): Factory connector or wiring routing issue. Warranty-covered.
- Fuel System Pressure Sensor (Low Likelihood): Sensor deviation causing DME misinterpretation. Warranty-covered.
Recommended Action
Schedule a BMW dealer appointment. Under warranty, ISTA+ diagnostics will identify the root cause. Software updates, component replacements, and all labor are covered at no charge.
Full Warranty
Your 2024 X5 is covered by BMW's 4-year/50,000-mile warranty and the federal emissions warranty (8 years/80,000 miles). All EVAP system repairs are free.
Safe to Drive?
Yes. P0446 has no effect on your X5's turbocharged engine, xDrive AWD, 8-speed automatic, air suspension, or towing capability. Full luxury SUV performance is maintained.