Tracking P0446 on Your 2022 Mercedes-Benz GLE
A P0446 code on your 2022 Mercedes-Benz GLE (W167) reveals an EVAP vent control circuit malfunction. The GLE offers the M264 2.0L turbo (GLE 350) or M256 3.0L turbo six with 48V EQ Boost (GLE 450). The engine control module has flagged a circuit fault in the canister shut-off valve.
At three to four years old, your GLE may still be within Mercedes-Benz's 4-year/50,000-mile warranty depending on purchase date and mileage. The federal emissions warranty provides reliable backup coverage.
Evidence Found
- Check engine light on with P0446 stored
- Fuel nozzle clicking off during refueling
- EVAP readiness monitor incomplete
- Possible companion EVAP codes
Ranked Suspects
- Canister Shut-Off Valve Malfunction (High Likelihood): The vent control valve is the primary P0446 component. After three to four years, early wear or connector issues are most common. Parts $95–$200, labor $135–$270.
- Valve Connector Issue (High Likelihood): The GLE's underbody connector exposure leads to corrosion from road spray and salt. Repair costs $80–$180.
- Engine Control Module Software (Medium Likelihood): Calibration update may address EVAP monitoring sensitivity. Dealer XENTRY reflash. Under warranty: $0.
- N80 Purge Valve Issue (Medium Likelihood): The N80 purge valve affects EVAP system balance. A weakening valve indirectly triggers vent circuit codes. Parts $110–$235, labor $125–$260.
- Wiring Damage (Low Likelihood): Road debris or moisture damage to the EVAP circuit wiring along the GLE's large underbody. Repair costs $90–$285.
Diagnostic Steps
- Connect XENTRY diagnostics — read all fault codes and freeze frame data
- Check for software updates for the W167 GLE
- Inspect canister shut-off valve and connector physically
- Test valve operation using XENTRY bidirectional controls
- Test N80 purge valve function
- Inspect wiring and EVAP lines under the vehicle
Cost Breakdown
- Canister shut-off valve: $230–$470
- Connector repair: $80–$180
- N80 purge valve: $235–$495
- Software update: $0–$195
- Diagnostic fee: $160–$250
Can I Drive With P0446?
Yes. P0446 is an emissions circuit code. Your GLE's engine, 9G-TRONIC automatic, 4MATIC AWD, air suspension, and all comfort features operate normally.
Warranty Check
Your 2022 GLE may still be within Mercedes-Benz's 4-year/50,000-mile warranty. The federal emissions warranty covers EVAP for 8 years/80,000 miles through 2030. Contact your dealer to verify coverage.