p0442
Easy Fix
Mercedes-Benz · SUVs
Evaporative Emission Control System Leak Detected (Small Leak)
Quick Answer
Error code P0442 on your Mercedes-Benz SUVs means: Evaporative Emission Control System Leak Detected (Small Leak). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
X243X247X254V167X167AMG GLB35 4MATIC 2024AMG GLC43 4MATIC 2024AMG GLC63 S 2024AMG GLE53 4MATIC+ 2024AMG GLE63 S 2024AMG GLS63 2024EQB 250+ 2024EQB 300 4MATIC 2024EQB 350 4MATIC 2024GLB250 2024GLB250 4MATIC 2024GLC300 2024GLC300 4MATIC 2024GLE350 4MATIC 2024GLE450 4MATIC 2024GLS450 4MATIC 2024GLS580 4MATIC 2024Maybach GLS600 2024
Likely Causes
How to Fix It
1
Replace the fuel cap with a new OEM cap and clear the code
2
Perform a low-pressure smoke test on the entire EVAP system
3
Carefully inspect all EVAP hose connections and clamps under magnification
4
Test EVAP vent valve and purge valve for sealing integrity
5
Inspect the charcoal canister for fine cracks or damage
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Fuel cap
EVAP vent valve
EVAP purge valve
EVAP system hoses
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