Mercedes-Benz Central Gateway Module ZGS (also referred to as CGW) may fail and causing various warning lights or systems to stop working.
Mercedes Central Gateway module is the hub that allows communication between various modules. Mercedes ZGW Gateway control module stores data for Mercedes ASSIST or ASSYST plus.
Problems with CGW can be very difficult to diagnose esepecially if you are not specialized in Mercedes-Benz vehicles.
Mercedes Central Gateway Module is the main hub that communicates with various ECUs and modules including seat module, front and rear SAM, audio gateway module, etc. Depending on how and what component of Mercedes Central Gateway module fails you will notice various lights and disabled systems.
On some models, the Central Gateway Module is mounted on the trunk floor of the vehicle where water can easily damage the unit.
Mercedes Central Gateway Module often fails due to water damage.
It can also fail from internal software or hardware defects.
Damage to the Mercedes Central Gateway Control module can be caused by a blocked drain valve in the trunk floor.
Symptoms of a bad Mercedes Central Gateway module usually vary from car to car.
A common symptom of bad Gateway Module is that there is no communication between an OBD-II scanner and one or more modules. Control modules that communicate via the Central Gateway module do not respond if the Gateway Module has failed.
In some cases, the engine will start and run fine but the vehicle may go in limp mode.
The central gateway control module can also allow systems to work at times then shut them down at unpredicted times due to a bad or corroded connection or terminal. A bad CGW can also cause the engine to randomly shut off even when driving.
You will have several warning lights stay ON on your cluster and several features stop working. Below is a list of warning lights and problems you may notice if your Mercedes Central Gateway Control module fails. This is a partial list and symptoms can vary between various Mercedes models such as C, E, S, CL, CLK, CLS, ML, G, GL, R, SL Class.
One or more of the following lights may come on.
When Mercedes Central Gateway Module fails one or more of these systems may stop working.
If your Mercedes-Benz gateway module has failed and doesn't communicate with other ECUs it will need to be replaced. Cleaning a Central Gateway Module terminals can be attempted but it is rarely a success.
A new CGW module can be purchased at the dealer or online. It is important that you get the CGW module coded properly with Star Diagnostic Scanner. The Star diagnostic scanner will need to have a subscription to complete online coding.
If you simply replace the bad CGW with a new one, you will have systems that will not work because they are not coded in the CGW module.
CGW/ZGW Gateway control module stores vehicle service history, VIN, and mileage of the car. You will need to code original miles and VIN in the new ZGW module by cloning the information from your old Mercedes ZGW control module. If the ZGW data cannot be read, manual coding can be performed by the dealer or a Mercedes mechanic.
For example, the power seats may not work because they are not coded in the new CGW module. Keyless entry may not work because it needs to be coded in the CGW module. You need to code the CGW module and tell what modules and systems are installed on that vehicle.
Below you will find a partial list of Mercedes-Benz Central Gateway Control Module part numbers. This is for reference only and you should never order parts based on this list. If you need to figure out the part number of your Mercedes-Benz call you dealer and provide the VIN of your vehicle.