Tracking P0456 on Your 2022 GLE
Your 2022 GLE (W167) has triggered P0456—a very small EVAP leak. The M256 3.0L turbo I6 or M176 4.0L twin-turbo V8 uses Mercedes's leak detection pump. Warranty runs through 2026.
Evidence
- Check engine light on
- P0456 stored
- No performance symptoms
- Fuel filler area may need cleaning
Suspects
- Fuel Filler Seal (High Likelihood): Debris or wear. $0 warranty or $15–$40.
- Leak Detection Pump (High Likelihood): Common Mercedes failure. $0 warranty or $310–$540.
- Purge Valve (Medium Likelihood): Heat cycling. $0 warranty or $200–$410.
- EVAP Hose (Medium Likelihood): Connection. $0 warranty or $180–$350.
- Activated Charcoal Filter (Low Likelihood): Premium filtration system. $400–$680.
Diagnostic Steps
- Clean fuel filler area
- Check warranty—4yr/50k through 2026
- Mercedes dealer—STAR diagnostics
- Independent specialist if out of warranty
Costs
- Under warranty: $0
- Leak detection pump: $310–$540
- Purge valve: $200–$410
- Federal emissions through 2030
Can I Drive?
Yes. P0456 has zero impact on the engine, 4MATIC, air suspension, or towing.
Warranty
Mercedes-Benz 4yr/50k through 2026. Federal emissions 8yr/80k through 2030. GLE EVAP repairs are premium-priced—use warranty.