Why is my Mercedes automatic not changing gears?

When the transmission is in “limp mode” and the gears cannot shift accurately, the whole gearbox is at fault. If there is an electrical issue, the main causes are likely faulty solenoids, a damaged speed sensor or selector sensor, or potentially even an issue with the transmission module itself.

What to do when your Mercedes goes into limp mode?

You may also get a check engine light if your transmission goes into limp mode. When a Mercedes-Benz goes into limp mode, it only operates in second gear and reverse only. When you put it in gear, you may also feel a bang as transmission engages. The first thing you should try is to check the transmission fluid level.

Why does my car go into limp mode?

Limp mode can occur when a set of conditions have been met that cause the transmission to try and preserve itself from a catastrophic failure. Most of the time, limp mode is going to max out the transmission line pressure and cause the transmission to shift really hard. It may also only allow the vehicle to operate in certain forward gears.

Where is the trouble code for limp mode?

Because of this, every time when the limp mode is active, there will be a stored trouble code in the trouble code memory. Therefore, the best solution to fix the limp mode without replacing the wrong parts is to find out which this trouble code is.

What to do when your transmission goes into limp mode?

If you are still having issues with the car going into limp mode and the scanner pointed you in the direction of the valve body then you may want to consider replacing it. The valve body is inside the transmission. The transmission does not need to be removed. Replacing the valve body can per perform with the transmission in place.

Why does my Mercedes have a limp mode?

Mercedes car limp mode is indicated by the check engine warning light, which activates when an issue erupts within the vehicle. If an error in the transmission causes the vehicle to jump into third gear and remain stuck in that position, you have a case of limp mode.

What should you do if your car goes into limp mode?

If you notice that your car has gotten into limp mode, you should fix it as soon as possible. The limp mode is designed so you can drive the closest way to a workshop to get the problem fixed. Do not drive around with the engine light ON.

Can a bad car battery cause limp mode?

There is no fixed amount of miles or km you can drive with limp mode. I do not recommend driving more than to the repair workshop when it appears. Can a bad battery cause limp mode? A bad car battery can absolutely cause limp mode.

What causes the transmission to go into limp mode?

Top reasons causing Transmission To Go Into Limp Mode: 1 Mass Air Flow Sensor could also cause your transmission to go into limp mode. 2 Defective shift module, inside the car. 3 Bad Speed Sensor 4 Brake Light Switch 5 Defective transmission control module. 6 Old Battery