The customer has arrived! Oh no, no, he was brought to our place with our tow truck. Savtrans Berlin garage brought in, with no signs of life whatsoever. The customer himself had no idea what could have happened, that his Mercedes-Benz V-Class, 2.0, 2019 had broken down and the engine wouldn't start.
Reading CAN bus errors – how the diagnosis works
- We performed a visual inspection in the engine bay and interior.
- We connected the diagnostic equipment
- We tested the entire system
- We have detected an error in the CAN bus system.
During the diagnosis, our auto electrician discovered that there had been a cable break in the CAN bus system.
What is a CAN bus?
This is a digital communication network that is installed in newer vehicle models for data exchange between the electronic control units (ECUs). The CAN bus system is responsible for the operation of the control unit, air conditioning, ABS, airbags, and the multimedia system.
CAN bus errors: typical symptoms
How can you tell that the CAN bus is the problem? Typically, several systems fail simultaneously – not just one. With our client, it was the engine that would no longer start. Frequent symptoms include:
The engine won't start
ABS, ESP or Airbag warning light is on
The air conditioning is no longer responding.
Speedometer or instrument cluster fails
Multimedia system not starting
Possible causes of a CAN bus failure
A CAN bus failure can have various causes:
Cable break in the wiring harness (as in our case)
Moisture or corrosion in connectors
Marten damage in the engine compartment
Faulty control unit blocking the bus
Undervoltage due to a weak battery
Our car repair shop Savtrans Berlin approaches troubleshooting and repair with extreme seriousness and responsibility. This case shows: a CAN bus cable break cannot be found „just like that“ – it requires experience, the right diagnostic equipment, and time. Our auto electrician Stas brought exactly that and had the vehicle back on the road within a day.
In addition to such electrical and electronic repairs, our workshop in Berlin also handles the diagnosis and repair of control units, sensors, on-board networks and other electronic systems – regardless of whether it's a Mercedes, BMW or other brands.
Should your vehicle break down, we can provide you with a tow truck. You can book an appointment and order a tow truck through us at +49 176 76766771.
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