tildaguenther64
Peugeot 107 Undervoltage Error
Summary of the thread
A 2013 Peugeot 107 diesel with 214,094 km is experiencing an undervoltage error, leading to poor starting, system failures, and weak lights. The issue is suspected to be a heavily discharged or defective battery. Suggestions include checking the voltage across the battery terminals while the engine is running and inspecting for corrosion on the terminals. Ultimately, the problem was resolved by replacing the defective battery at a garage.
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4 comment(s)
tildaguenther64 (community.author)
Cheers for the reply. I'll check the voltage across the terminals when running. Where exactly is the voltage regulator usually located? Is it easy to get to?
AliyahBodenXtreme
On the Megane, it was built into the alternator, a right pain to get to! Usually they are near the alternator, but I'm not 100% where it is on a 107. Honestly, if you're not confident tracing wires and testing stuff, it might be worth popping down to a workshop. Electrical gremlins can be a real headache and it's easy to fry something if you're not careful. They can do a proper load test on the battery and check the whole charging system.
tildaguenther64 (community.author)
Thanks for the advice. Took it to a garage, and you were spot on. Battery was heavily discharged and defective. New battery fitted and all sorted for 290€.
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PEUGEOT
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107
AliyahBodenXtreme
Sounds familiar! I had similar gremlins with my old Renault Megane. Dash lights flickering like a Christmas tree, ABS throwing a tantrum, the whole shebang! Turned out to be a dodgy voltage regulator. Have you checked the voltage across the battery terminals while the engine's running? Should be around 14V. Also, any signs of corrosion on the battery terminals themselves? Even a little bit can cause a voltage drop and mess things up.