Investigating P0446 on Your 2022 Ram 1500
A P0446 code on your 2022 Ram 1500 signals an EVAP vent control circuit malfunction. The fifth-generation Ram 1500 (DT platform) uses Stellantis' ESIM (Evaporative System Integrity Monitor) to manage EVAP venting and leak detection. Whether your truck has the 5.7L HEMI V8 (with eTorque) or 3.6L Pentastar V6, the EVAP system is the same.
At three to four years old, your Ram may still be within the 3-year/36,000-mile basic warranty. The 5-year/60,000-mile powertrain and federal emissions warranties extend coverage further.
Evidence Found
- Check engine light on with P0446
- Fuel nozzle shutting off during fill-ups
- EVAP readiness monitor incomplete
- Possible companion codes P0441, P0455, or P0456
Ranked Causes
- ESIM Module Failure (High Likelihood): The integrated ESIM unit is the primary P0446 suspect. After three to four years of service and truck-duty vibration, the module can fail. Parts $90–$175, labor $105–$215.
- ESIM Connector Corrosion (High Likelihood): The underbody-mounted ESIM connector is exposed to road spray, salt, and off-road conditions. Repair costs $75–$165.
- EVAP Line Damage Along Frame (Medium Likelihood): The Ram's body-on-frame construction has EVAP lines routed along the frame rails — vulnerable to road debris and towing stress. Repair costs $80–$250.
- PCM Software Update (Medium Likelihood): Stellantis calibration updates for EVAP monitoring. Dealer reflash. Under warranty: $0.
- Charcoal Canister Issue (Low Likelihood): The Ram's larger canister handles more fuel vapor from the big tank. Premature issues are uncommon at this age. Parts $150–$310, labor $115–$230.
Diagnostic Steps
- Scan all codes and freeze frame data with Stellantis-compatible scanner
- Check for TSBs and software updates for the DT Ram 1500
- Inspect ESIM module and connector
- Test ESIM operation using wiTECH bidirectional controls
- Inspect EVAP lines along the frame
- Smoke test if leak codes present
Cost Estimates
- ESIM module: $195–$390
- Connector repair: $75–$165
- EVAP line repair: $80–$250
- Software update: $0–$155
- Diagnostic fee: $95–$160
Can I Drive With P0446?
Yes. P0446 doesn't affect your Ram's HEMI V8 or Pentastar V6, 8-speed automatic, 4WD, towing, or payload capability. Full truck performance is maintained.
Warranty Check
Your 2022 Ram may still have basic warranty coverage (3yr/36k). The 5yr/60k powertrain and federal emissions warranty (8yr/80k through 2030) provide extended coverage.