Cracking the P0440 Code on Your 2022 Volkswagen Passat
A P0440 on your 2022 VW Passat (NMS platform, final model year) signals an EVAP malfunction. The 2.0L TSI turbo (174 hp) with 6-speed automatic uses VW's standard EVAP system. With a few years of service, EVAP components may need attention. Let's follow the clues.
Symptoms
- Check engine light on
- Faint fuel odor
- Slight MPG decrease
- Fueling difficulties
- Emissions test failure
Your Passat drives normally. TSI engine and transmission are unaffected.
Most Likely Causes
- Gas Cap — Worn or loose. Estimated repair: $5–$25.
- Purge Valve (N80) — VW purge solenoid. Can stick. Estimated repair: $75–$195.
- Vent Valve — Controls EVAP venting. Estimated repair: $85–$215.
- EVAP Leak Detection Pump — Can fail. Estimated repair: $95–$250.
- Vapor Line Leak — Small cracks. Estimated repair: $40–$135.
Diagnostic Steps
- Replace gas cap, clear code, drive 50+ miles
- Scan with VCDS
- Test N80 and vent valve
- Smoke test if needed
- Check for TSBs
Repair Costs
- Gas cap: $5–$25
- N80 valve: $75–$195
- Vent valve: $85–$215
- LDP: $95–$250
- Vapor line: $40–$135
- Diagnostic: $80–$150
Warranty: Check mileage — VW's 4-year/50,000-mile warranty may still apply.
Can I Drive With P0440?
Yes. No performance or safety impact.
DIY Feasibility
DIY-friendly. The N80 is accessible on the 2.0L TSI. VCDS is the go-to VW diagnostic tool. Parts are affordable and available.