P0455 on Your 2024 Mercedes-Benz GLC
A P0455 on your 2024 GLC (X254) means the ECU detected a large EVAP leak. This redesigned GLC with the 2.0L turbo-4 is fully under warranty. Check the gas cap first.
Symptoms
- Check engine light with P0455
- Possible fuel smell
- Gas cap not seating
- EVAP monitor incomplete
Top Causes
- Gas Cap Seal (Very High Likelihood): Loose or factory defect. Warranty-covered.
- EVAP Purge Valve (Medium Likelihood): Mercedes purge valve. Warranty-covered.
- Leak Detection Pump (Medium Likelihood): Mercedes LDP module. Warranty-covered.
- Fuel Tank Vent Valve (Low Likelihood): Factory defect. Warranty-covered.
- ECU Software (Low Likelihood): Calibration update. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If P0455 persists, visit your Mercedes dealer for free warranty repair using XENTRY diagnostics.
Warranty
Your 2024 GLC is covered by Mercedes' 4-year/50,000-mile warranty through 2028. Federal emissions (8yr/80k) extends through 2032.
Safe to Drive?
Yes. P0455 doesn't affect the turbo engine, 4MATIC, or any features.