2022 Mercedes-Benz GLC P0455: Large EVAP Leak Fix

Investigating P0455 on Your 2022 Mercedes-Benz GLC

A P0455 on your 2022 GLC (X253) means a large EVAP leak. Your GLC 300 with the 2.0L turbo is likely under warranty. The gas cap is the first clue.

Evidence

• Check engine light on
• P0455 stored in ECU
• Possible fuel odor
• Gas cap issue

Causes Ranked

1. Gas Cap Seal (Very High Likelihood): Loose or worn. $0–$35.
2. Leak Detection Pump (Medium Likelihood): Mercedes LDP. $280–$500 installed.
3. EVAP Purge Valve (Medium Likelihood): Sticking. $200–$400 installed.
4. Fuel Tank Vent Valve (Low-Medium Likelihood): Seal failure. $220–$420 installed.
5. Vapor Line (Low Likelihood): Connection issue. $120–$280.

Diagnosis

Gas cap first. If P0455 persists, XENTRY diagnostics at a Mercedes dealer will identify the fault.

Warranty

Your 2022 GLC is likely under Mercedes' 4-year/50,000-mile warranty through 2026. Federal emissions (8yr/80k) covers EVAP through 2030.

Safe to Drive?

Yes. P0455 is vapor only. Engine, 4MATIC, and all features unaffected.

Frequently Asked Questions