Mercedes-Benz E-Class Coupe 2017 Owner's Manual page 400

Display messages
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Check trailer hitch lock
Apply brake to deselect
Park (P) position
Possible causes/consequences and
* The trailer hitch is not operational.
& 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.
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions.
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Do not continue driving under any circumstances.
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.
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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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When the display message disappears, couple up the trailer and drive on.
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If the display message does not disappear, the trailer hitch is defective and the ball neck is not locked.
Do not couple up the trailer. Drive on without the trailer. Pay attention to the reduced ground clearance due to
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the unlocked ball neck.
Consult a qualified specialist workshop.
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* You have attempted to shift the transmission out of position j and into another transmission position.
Depress the brake pedal.
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Display messages and warning/indicator lamps 397
M M Solutions