matteobaumann6
Fiat 124 Undervoltage Error
Summary of the thread
A 2019 Fiat 124 with nearly 200,000 kilometers is experiencing an undervoltage error, leading to poor starting, random system failures, flickering lights, and a weak battery. The issue may stem from a heavily discharged or defective battery, but other potential causes include corroded or loose battery terminals and a malfunctioning alternator. Suggested solutions include checking the battery terminals for corrosion, ensuring connections are secure, and verifying the alternator's output with a multimeter. If these checks don't resolve the issue, consulting a qualified automotive technician is recommended for a comprehensive diagnosis.
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4 comment(s)
matteobaumann6 (community.author)
Okay, thanks for the info. How would I go about checking the alternator output? What kind of voltage should I be seeing there?
dirkfrost9
Verifying the alternator output requires a multimeter. With the engine running, you should observe a voltage reading between 13.8 and 14.4 volts at the battery terminals. Readings outside this range indicate a potential alternator malfunction. Given the complexity and potential for electrical damage, I would recommend consulting a qualified automotive technician for a comprehensive assessment. They possess the necessary tools and expertise to diagnose the underlying cause accurately. In my case, a visit to the workshop revealed a defective battery, leading to a replacement cost of approximately 290€.
matteobaumann6 (community.author)
Appreciate the help. Sounds like it's best to take it in. Thanks for the advice!
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FIAT
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124
dirkfrost9
I had a similar experience with my 124. The undervoltage issue can manifest in various ways, as you've described. Before condemning the battery, I would recommend a thorough diagnostic process. Have you checked the battery terminals for corrosion or loose connections? Also, it would be prudent to examine the alternator's output to ensure it is charging the battery correctly. A weak alternator can lead to a chronically undercharged battery, which would explain the symptoms you're observing.