elizabetheagle1
Mercedes A Klasse electrical issues
Summary of the thread
A 2017 Mercedes A Klasse with 177,234 kilometers is experiencing electrical issues, including warning lights and system failures. The suspected cause is a defective cable connection to the BUS system of the control unit. A similar issue was resolved by checking the battery voltage and inspecting for loose or corroded connectors, particularly in the CAN bus system. A workshop visit confirmed and rectified the defective cable connection, resolving the problem.
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4 comment(s)
elizabetheagle1 (community.author)
Thank you for your prompt response. Regarding your question, the control unit shutdowns can occur both while driving and upon starting the vehicle. I have not yet tested the battery voltage, but I will certainly add that to my list of checks. Could you elaborate on what you mean by 'bad connection'? Are we talking about a specific connector or wiring harness that is known to be problematic?
martinswift6
Yeah, same thing happened to me. Battery voltage seemed fine, but the problems persisted. By 'bad connection', I mean it's likely a loose or corroded connector on one of the modules. However, finding it is difficult. I suggest going to a workshop and having them check the connections to the CAN bus. They should have the proper diagnostic tools to pinpoint the issue. Cost me around 155€ to get it sorted.
elizabetheagle1 (community.author)
Thank you very much for the advice and confirmation that you experienced a similar situation. Based on your recommendation, I took the car to a workshop for a thorough inspection of the cable connections. Indeed, a defective cable connection to the BUS system of the control unit was identified as the source of the problem, and it has since been rectified. I appreciate you sharing your experience!
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MERCEDES
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AKLASSE
martinswift6
I have the same model. Sounds like you're having the same issues I did. Check engine light, right? Could be a bad connection somewhere. Start with the basics. Have you checked the battery voltage? A low battery can cause all sorts of weird electrical problems on these cars. When a control unit 'shuts down', does it happen while driving or when you start the car?