Cracking the P0440 Case on Your 2022 Mercedes-Benz GLE
A P0440 on your 2022 Mercedes-Benz GLE (W167) points to an EVAP system malfunction. The GLE 350 (2.0L turbo, 255 hp) and GLE 450 (3.0L inline-six, 362 hp) use Mercedes's EVAP system with the leak detection pump. With a few years of use, certain components may need attention. Let's investigate.
Symptoms
- Check engine light on
- Faint fuel smell
- Slight MPG decrease
- Fueling difficulties
- Emissions test failure
Your GLE drives normally. Engine, 9G-TRONIC, 4MATIC, and air suspension are unaffected.
Most Likely Causes
- Fuel Filler Seal — Worn or loose. Estimated repair: $5–$35.
- Leak Detection Pump (LDP) — Mercedes EVAP pump. Known failure. Estimated repair: $155–$380.
- Purge Valve — Controls vapor flow. Estimated repair: $120–$290.
- Shut-Off Valve — Controls EVAP venting. Estimated repair: $130–$310.
- EVAP Hose Leak — Small cracks. Estimated repair: $55–$165.
Diagnostic Steps
- Check fuel filler, clear code, drive 50+ miles
- Scan with XENTRY or Star Diagnostic
- Test LDP, purge valve, shut-off valve
- Smoke test if needed
- Check for W167 TSBs
Repair Costs
- Fuel filler: $5–$35
- LDP: $155–$380
- Purge valve: $120–$290
- Shut-off valve: $130–$310
- EVAP hose: $55–$165
- Diagnostic: $100–$185
Warranty: Check your mileage — Mercedes's 4-year/50,000-mile warranty may still apply.
Can I Drive With P0440?
Yes. No performance or safety concerns.
DIY Feasibility
Moderate difficulty. The LDP and purge valve are accessible but the GLE's size makes underbody work more involved. Independent Mercedes shops save 25-35% over dealers.