Emergency mode of automatic transmission in Mercedes W164
The emergency mode of the automatic transmission is designed to limit the movement of the vehicle if a transmission malfunction is detected. It includes the following measures:
* Engaging the gear only at one or two speeds (usually 2nd or 3rd gear).
* Reduced engine power.
* Speed limit.
Causes of automatic transmission emergency mode
There can be many reasons for activating the automatic transmission emergency mode, including:
* Low transmission fluid (ATF) level.
* Dirty or old ATF.
* Problems with transmission sensors.
* Malfunction of hydraulic unit solenoids.
* Problems with mechanical components of the transmission.
Symptoms of automatic transmission emergency mode
When activating the emergency mode of the automatic transmission, you may encounter the following symptoms:
* ‘Check Engine’ indicator on the dashboard.
* Flashing or burning automatic transmission light on the dashboard.
* Popping or banging noises when shifting gears.
* Slipping or lack of clutch when changing gears.
* Limited driving speed.
What to do if you are faced with an automatic transmission emergency mode
If you encounter an automatic transmission emergency mode, follow these steps:
1. Check the ATF level. Make sure the ATF level is correct and that the fluid is not contaminated.
2. Scan the vehicle for fault codes. This will help determine the cause of the emergency mode.
3. Contact a qualified mechanic. An automatic transmission in emergency mode indicates a serious problem that requires professional repair.
Preventing automatic transmission emergency mode
To prevent automatic transmission emergency mode from occurring, follow these steps:
* Check and top up ATF regularly.
* Change ATF and oil filter according to manufacturer’s recommendations.
* Avoid sudden acceleration and braking.
* Perform regular vehicle maintenance, including transmission inspection and repair.