Investigating P0446 on Your 2023 Jeep Gladiator
A P0446 code on your 2023 Jeep Gladiator reveals an EVAP vent control circuit malfunction. The JT-platform Gladiator uses Stellantis' ESIM (Evaporative System Integrity Monitor), an integrated module that handles both vent control and leak detection near the charcoal canister.
At only two to three years old, your Gladiator should still be under the original factory warranty. This makes the dealer your first stop for a no-cost diagnosis and repair.
Evidence Gathered
- Check engine light illuminated with P0446
- Fuel pump nozzle clicking off during refueling
- EVAP monitor incomplete on readiness status
- Possible companion codes present
Leading Causes
- ESIM Module Defect (High Likelihood): Even relatively new, the ESIM unit can have manufacturing defects or early failures. This integrated unit is the primary P0446 suspect. Warranty-covered.
- ESIM Connector Issue (High Likelihood): Factory connector fit, early corrosion from off-road use, or debris contamination. Warranty-covered.
- PCM Software Calibration (Medium Likelihood): Stellantis may have updated EVAP monitoring parameters. A dealer reflash resolves this. Warranty-covered.
- EVAP Line Connection Issue (Medium Likelihood): Off-road vibration or impacts can loosen EVAP line connections along the Gladiator's frame. Warranty-covered.
- Charcoal Canister Issue (Low Likelihood): Uncommon on a newer truck unless water intrusion occurred during off-roading. Warranty-covered.
Recommended Action
Take your 2023 Gladiator directly to a Jeep dealer. Under warranty, the dealer will use wiTECH diagnostics to test the ESIM module, check for TSBs, and apply any PCM calibration updates — all at no cost to you.
Warranty Status
Your 2023 Gladiator is within Jeep's 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. The federal emissions warranty adds 8 years/80,000 miles of EVAP coverage. All repairs should be free.
Can I Still Drive?
Yes. P0446 has zero impact on your Gladiator's 3.6L Pentastar V6, 6-speed manual or 8-speed automatic, 4WD, towing, or off-road capability. Drive normally to the dealer.