franziskadunkel1

Cobalt Electrical Issue

Hey, I'm having a major electrical issue with my 2009 Chevrolet Cobalt with a gasoline engine. The battery keeps getting heavily discharged. I'm seeing an error message in the speedometer, the lights are weak and flickering, and the error memory has a bunch of codes related to low voltage. Starting the engine is a struggle; the battery is just too weak. I suspect a defective battery sensor based on some research. Anyone experienced similar symptoms? I'm pulling my hair out here!

A 2009 Chevrolet Cobalt is experiencing a major electrical issue, with symptoms including a heavily discharged battery, error messages, weak and flickering lights, and low voltage error codes. The problem is suspected to be a defective battery sensor. After consulting with a mechanic, the issue is confirmed to be the battery sensor, which is then repaired, resolving the electrical problems.

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4 comment(s)

Greetings. I understand you're experiencing a discharged battery issue in your 2009 Chevrolet Cobalt. The symptoms you describe, including the error message, weak lights, stored error codes, and starting difficulties, certainly point to a significant electrical problem. Have you tested the battery's voltage when the car is off and when it's running? What values did you get?

Thanks for the quick reply! Yes, I measured the voltage. When the car is off, it reads around 11.8V, and when it's running, it barely hits 13.2V. Does that confirm my suspicion of a faulty battery sensor, or could there be something else at play here? I'm trying to avoid unnecessary expenses.

Those voltage readings are indeed concerning. A healthy charging system should read closer to 14V when running. While a faulty battery sensor is a strong possibility, other components like the alternator or even a parasitic draw could be contributing. With those symptoms and error codes, it's wise to bring the car to a trusted workshop to confirm the diagnosis. They have the proper tools to pinpoint the exact cause. It sounds like this is beyond a simple fix.

You were spot on! I took it to my mechanic, and it was indeed the battery sensor. The repair, including parts and labor, came out to 315€. Thanks a bunch for your advice; it saved me a lot of time and potential misdiagnosis!

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CHEVROLET

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COBALT