Problems with the engine
Problem | Possible causes/consequences and - Solutions |
The engine does not start. The starter motor can be heard. | - There is a malfunction in the engine electronics.
- There is a malfunction in the fuel supply. •► Before attempting to start the engine again, turn the SmartKey in the ignition back to position 0 or press the Start/Stop button repeatedly until all indicator lamps in the instrument cluster go out. •► Try to start the engine again (Y page 146). Avoid excessively long and frequent attempts to start the engine as these will drain the battery. If the engine does not start after several attempts: •► Consult a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center. |
The engine does not start. You cannot hear the starter motor. | The on-board voltage is too low because the battery is too weak
or discharged.
•► Jump-start the vehicle (Y page 338). If the engine does not start despite attempts to jump-start it: •► Consult a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center. The starter motor was exposed to a thermal load that was too high. •► Allow the starter motor to cool down for approximately two minutes. •► Try to start the engine again. If the engine still does not start: •► Consult a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center. |
Vehicles with a
gasoline engine:
The engine is not running smoothly and is misfiring. |
There is a malfunction in the engine electronics or a mechanical
component of the engine management system.
•► Only depress the accelerator pedal slightly. •► Have the cause rectified immediately at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center. Otherwise, non-combusted fuel may get into the catalytic converter and damage it. |
The coolant temperature gauge shows a value above 248 °F (120 °C). | The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
•► Stop as soon as possible and allow the engine and the coolant to cool down. •► Check the coolant level. Observe the warning notes as you do so and add coolant if necessary. |
See also:
Checking tire pressures manually
To determine and set the correct tire
pressure, proceed as follows:
– Remove the valve cap of the tire that is to
be checked.
– Press the tire pressure gauge securely onto
the valve.
– Read t ...
Switching on/off
The three red indicator lamps in the button
indicate the heating level you have selected.
If the battery voltage is too low, the seat
heating may switch off.
One or more of the indicator lamp ...
Trailer towing
- Drive in the middle of the engine speed
range on uphill gradients.
- Depending on the uphill or downhill
gradient, shift down into shift range 3 or
2, even if cruise control or
DISTRONIC PL ...