Tracking P0446 on Your 2022 BMW 5 Series
A P0446 code on your 2022 BMW 5 Series (G30 LCI) signals an EVAP vent control circuit malfunction. The facelifted G30 uses the B48 2.0L turbo (530i) or B58 3.0L turbo (540i), with the DME monitoring the fuel tank vent valve (FTVV) circuit for proper operation.
At three to four years old, your 5 Series should still be within or near the end of BMW's 4-year/50,000-mile warranty. The federal emissions warranty provides backup coverage for EVAP components.
Clues Gathered
- Check engine light illuminated with P0446
- Fuel nozzle clicking off prematurely
- EVAP monitor incomplete on readiness check
- Possible companion codes in DME memory
Ranked Suspects
- Fuel Tank Vent Valve (FTVV) Malfunction (High Likelihood): The plastic FTVV is the primary P0446 component. Early wear or manufacturing variation can cause circuit faults. Parts $90–$180, labor $125–$250.
- FTVV Connector Issue (High Likelihood): Connector corrosion or poor pin contact from underbody exposure. Repair costs $70–$165.
- DME Software Refinement (Medium Likelihood): A calibration update may address EVAP monitoring sensitivity. Dealer reflash. Under warranty: $0.
- Leak Diagnosis Pump (LDP) Issue (Medium Likelihood): Early LDP wear affects EVAP monitoring accuracy. Parts $110–$230, labor $130–$265.
- Wiring Harness Damage (Low Likelihood): Road debris or moisture damage to EVAP circuit wiring. Repair costs $90–$275.
Diagnostic Steps
- Scan all DME codes and freeze frame data with ISTA+ or compatible tool
- Check DME software version — update if newer calibration available
- Inspect FTVV and connector for damage, corrosion, or wear
- Test FTVV solenoid resistance and bidirectional operation
- Test LDP function and system integrity
- Check wiring harness from FTVV/LDP to DME
Cost Breakdown
- Fuel tank vent valve: $215–$430
- Connector repair: $70–$165
- LDP replacement: $240–$495
- DME reflash: $0–$175
- Diagnostic fee: $150–$220
Can I Drive With P0446?
Yes. P0446 doesn't impact your 5 Series' performance. The turbocharged engine, 8-speed automatic, xDrive AWD, and all comfort features operate normally.
Warranty Status
Your 2022 5 Series may still be within BMW's 4-year/50,000-mile warranty. The federal emissions warranty covers EVAP for 8 years/80,000 miles through 2030. Check with your BMW dealer for coverage verification.