By YOUCANIC on May 24, 2019
In this guide, we take a look at how to troubleshoot BMW CAN Network. Learn what CAN Network does, common problems, how to read/clear codes from CAN Network and perform tests yourself.
CAN stands for Controller Area Network integrates BMW control units in one network improving communication speed while reducing the number of wires needed for s to communicate.
BMW CAN network makes it easy to perform diagnostics using a BMW OBD-II scanner.
BMW CAN network connect various s including transmission (EGS), Engine Control Module (DME), antilock brake (ABS), traction control/stability control system (DSC), electronic steering, climate control system, lighting control and many more.
BMW vehicles may have more than one CAN network. Examples of BMW CAN Networks:
List of possible symptoms you may notice if the CAN Network or one of its components fails.
Possible problems that can trigger fault codes in the CAN Network.
If you are experiencing problems a good starting point is to read fault codes from the CAN Network. If any code is showing PRESENT status the problem needs to be fixed before the code can be cleared.
What you will need
A diagnostic scanner that is capable of reading, clearing and performing bi-directional tests on BMW vehicles. You must verify that the scanner that you use supports your BMW model and year. Full system scanners that are known to work on BMW vehicles can range in price from $150 to $800 USD.
List of scanners that read and clear BMW CAN Network fault codes.
These are only a few examples. Many diagnostic scanners allow you to read and clear BMW CAN Network fault codes. To learn about OBD2 scanners that work on BMWs check the article on Choosing the best OBD2 scanner for BMW.
There are hundreds of fault codes that can be related to BMW CAN Network. Below are a few examples of codes stored in BMW CAN Network.
These fault codes will show during netwrok analysis but will be stored in the corresponding control unit as well.