valentinaherrmann1
Mercedes CLA undervoltage mystery
Summary of the thread
A 2015 Mercedes CLA was experiencing undervoltage issues, causing starting problems and flickering lights. The initial suspicion was a bad battery, but potential causes included a faulty charging system or parasitic draw. After taking the car to a shop, it was confirmed that the battery was heavily discharged and defective, and replacing it resolved the issues.
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4 comment(s)
valentinaherrmann1 (community.author)
Parasitic draw What's that How do I even test my battery I'm not really a car guy, you know Is it really that complicated I was hoping it's just the battery
lilly_schwarz50
Parasitic draw refers to components draining battery power when the car is off. Testing requires specialized equipment. Given the symptoms and your unfamiliarity with automotive electrics, a workshop visit is advisable. It could be a defective battery, but the underlying cause might be a faulty module or wiring issue.
valentinaherrmann1 (community.author)
Thanks for the advice I took it to a shop They said the battery was heavily discharged and defective They replaced it I ended up paying 290€ Seems to have fixed all the issues I really appreciate the help
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MERCEDES
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CLA
lilly_schwarz50
Undervoltage issues in the CLA can be complex. I've experienced similar symptoms. Begin with a thorough battery health assessment. Check for voltage drop under load. Also, examine the charging system's output and ensure stable battery terminal connections. A parasitic draw test could also point to the source of the voltage drain.