The P0446 Investigation on Your 2019 Jeep Grand Cherokee
Your 2019 Jeep Grand Cherokee has flagged a P0446 code — an EVAP vent control circuit malfunction. The fourth-generation Grand Cherokee (WK2 platform) uses an NVLD (Natural Vacuum Leak Detection) system — Stellantis' unique approach to EVAP vent control that uses vacuum decay rather than a traditional vent solenoid. Whether you have the 3.6L Pentastar V6 or 5.7L HEMI V8, the PCM has found a circuit fault after six years of service.
The WK2 Grand Cherokee's NVLD system is well-documented after years of production, and the P0446 diagnostic trail is well-worn.
Symptoms Noticed
- Check engine light on with P0446
- Fuel filling issues — nozzle clicks off
- EVAP monitor not completing
- May appear with P0440 or P0455
Ranked Causes
- NVLD Unit Failure (High Likelihood): Six years of operation wear the NVLD module. Electrical failure or internal component stuck is common. Parts $70–$160, labor $110–$240.
- NVLD Wiring and Connector Corrosion (High Likelihood): Road salt, moisture, and debris corrode the NVLD connections over time. Repair costs $90–$300.
- Charcoal Canister Degradation (Medium Likelihood): The HEMI V8 generates substantial fuel vapors, putting extra demand on the canister. Replacement costs $170–$380.
- Purge Solenoid Wear (Medium Likelihood): Age-related purge solenoid failure affects EVAP system balance. Replacement costs $75–$195.
- PCM Ground Issue (Low Likelihood): A corroded ground in the NVLD circuit. Repair costs $60–$175.
Diagnostic Steps
- Scan for all codes and freeze frame data
- Locate the NVLD near the fuel tank
- Inspect the NVLD connector for corrosion and damage
- Test NVLD circuit with a multimeter
- Check wiring along the frame from the NVLD to the PCM
- Inspect the charcoal canister for damage or saturation
Cost Estimates
- NVLD replacement: $180–$400
- Wiring/connector repair: $90–$300
- Charcoal canister: $170–$380
- Purge solenoid: $75–$195
- Diagnostic fee: $90–$150
Can I Drive With P0446?
Yes. P0446 is an emissions code. Your Grand Cherokee's engine, Quadra-Trac/Selec-Terrain AWD, and towing capability are unaffected.
Warranty and DIY
Your 2019 Grand Cherokee is past Jeep's basic warranty but within the 8-year/80,000-mile federal emissions warranty. Check mileage. For DIY, the NVLD is accessible but uses Stellantis' unique vacuum-decay approach — not a standard vent solenoid.