Solving P0446 on Your 2024 Mercedes-Benz GLE
A P0446 code on your 2024 Mercedes-Benz GLE (W167 facelift) indicates an EVAP vent control circuit malfunction. The refreshed GLE offers the M254 2.0L turbo with 48V EQ Boost (GLE 350) or M256 3.0L turbo six with 48V (GLE 450/580). The engine control module has detected a circuit fault in the canister shut-off valve.
Under full Mercedes-Benz warranty, this is a dealer repair at no cost. The facelifted W167 benefits from production refinements, but EVAP codes can occur on any vehicle.
What You're Seeing
- Check engine light with P0446
- Fuel fill difficulties
- EVAP readiness monitor incomplete
- Possible companion codes stored
Likely Causes
- Canister Shut-Off Valve Defect (High Likelihood): Manufacturing variation in the vent valve. Primary P0446 component on all Mercedes models. Warranty-covered.
- Engine Control Module Software (High Likelihood): EVAP monitoring calibration updates for the facelifted GLE. A software reflash is a common quick fix. Warranty-covered.
- N80 Purge Valve Issue (Medium Likelihood): The purge valve affects overall EVAP function. Factory defect possible. Warranty-covered.
- EVAP Circuit Connector (Medium Likelihood): Factory connector seating issue. The GLE's large underbody has extensive EVAP line routing. Warranty-covered.
- Fuel Tank Pressure Sensor (Low Likelihood): Sensor deviation affecting control module readings. Warranty-covered.
What to Do
Schedule a Mercedes-Benz dealer appointment. Under warranty, XENTRY diagnostics, software updates, and all component replacements are free. No out-of-pocket cost.
Full Warranty Coverage
Your 2024 GLE is covered by Mercedes-Benz's 4-year/50,000-mile warranty and the federal emissions warranty (8 years/80,000 miles). All EVAP repairs are free.
Safe to Drive?
Yes. P0446 doesn't affect your GLE's engine, 9G-TRONIC automatic, 4MATIC AWD, air suspension (if equipped), or towing capability. Full luxury SUV performance is maintained.