Tracking P0446 on Your 2022 Jeep Grand Wagoneer
A P0446 code on your 2022 Jeep Grand Wagoneer signals an EVAP vent control circuit malfunction. The WS-platform Grand Wagoneer — Jeep's flagship full-size luxury SUV powered by the 6.4L HEMI V8 (471 hp) — uses Stellantis' ESIM (Evaporative System Integrity Monitor) for EVAP management.
The Grand Wagoneer's large fuel tank and extensive EVAP plumbing create more potential failure points than smaller vehicles. As a first-generation model launched in 2022, early production units may be more susceptible to initial component issues. Warranty should still apply.
Clues Observed
- Check engine light illuminated with P0446
- Fuel fill difficulties at the pump
- EVAP readiness monitor not completing
- Possible companion EVAP codes stored
Top Suspects
- ESIM Module Issue (High Likelihood): The integrated ESIM handles vent control and leak detection. First-generation production parts may have quality variations. Parts $100–$185, labor $115–$235.
- ESIM Connector or Wiring Issue (High Likelihood): The Grand Wagoneer's size means longer wiring runs to the rear-mounted ESIM. Connector integrity is critical. Repair costs $85–$195.
- PCM Software Calibration (Medium Likelihood): First-year HEMI V8 EVAP calibration may need updating. The 6.4L's high fuel vapor production requires precise monitoring. Warranty reflash.
- EVAP Line Routing Issue (Medium Likelihood): The large body-on-frame platform has extensive EVAP plumbing along the frame rails. Loose connections or pinched lines. Repair costs $80–$250.
- Charcoal Canister Overload (Low Likelihood): The larger fuel tank requires a larger canister. Premature saturation is uncommon on newer vehicles. Parts $160–$340, labor $125–$250.
Diagnostic Process
- Full code scan with freeze frame data review
- Check for TSBs specific to the WS-platform Grand Wagoneer
- Inspect ESIM module, connector, and surrounding wiring
- Test ESIM operation using wiTECH bidirectional controls
- Verify EVAP line connections along the full-length frame
- Check PCM calibration version against latest available
Cost Estimates
- ESIM module replacement: $215–$420
- Connector/wiring repair: $85–$195
- PCM reflash: $0–$165
- EVAP line repair: $80–$250
- Diagnostic fee: $100–$175
Can I Keep Driving?
Yes. P0446 has no effect on your Grand Wagoneer's 471-hp 6.4L HEMI V8, 8-speed automatic, Quadra-Trac II 4WD, air suspension, or towing capacity (up to 9,850 lbs). Full luxury SUV capability is maintained.
Warranty Coverage
Your 2022 Grand Wagoneer should still be within the 3-year/36,000-mile basic warranty or very close to expiration. The 5-year/60,000-mile powertrain warranty and federal emissions warranty (8 years/80,000 miles) provide extended coverage. Dealer visit recommended.