Mercedes-Benz E-Class Estate 2017, Owner'S Manual

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Display messages
Possible causes/consequences and M M Solutions
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Check trailer hitch lock
* The trailer hitch is not operational when you are driving with a trailer.
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Stop the vehicle immediately, paying attention to road and traffic conditions, and switch off the engine.
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Uncouple the trailer and safeguard it against rolling away.
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Initiate a new swivelling procedure .
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If the ball neck is extended, press and hold the button on the tailgate until the ball neck engages beneath the
bumper.
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When the display message disappears, couple up the trailer and drive on.
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WARNING Risk of an accident if the ball neck is not locked
If the ball neck is not in the locked position, the trailer may come loose.
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Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions.
Do not continue driving under any circumstances.
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Uncouple the trailer and secure it against rolling away.
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Initiate a new swivelling procedure and do not re-couple the trailer until the display message disappears.
If the display message does not disappear, the trailer hitch is defective and the ball neck is not locked.
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Do not couple up the trailer. Drive on without the trailer. Note the reduced ground clearance due to the
unlocked ball neck.
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Consult a qualified specialist workshop.
The trailer hitch is not operational when the vehicle is at a standstill.
Display messages and warning/indicator lamps 509