finn_knight1
S40 Fault Memory Lock Active Undervoltage
Summary of the thread
A 2009 Volvo S40 diesel displayed a 'Fault memory lock active' error, raising concerns about a potential ECU issue. The problem was identified as being caused by undervoltage, which can lead to various errors. It was suggested to check the battery or alternator, and the issue was resolved at a workshop for 240€.
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4 comment(s)
finn_knight1 (community.author)
Undervoltage, huh? I haven't checked either, honestly. I'm not really sure where to start looking for that kind of issue. Is it something I can fix myself, or am I better off taking it in?
henry_baumann91
Yeah, undervoltage can cause all sorts of phantom errors. Think of it like a gremlin sneaking into your car's brain. While you could try diagnosing it yourself with a multimeter, chasing electrical gremlins can be a real pain. Honestly, I bit the bullet and took mine to a shop. Cost me about 240€, but they sorted it right out. Best money I ever spent!
finn_knight1 (community.author)
Okay, you've convinced me. I'll take it to a workshop. Thanks for the tip! I had it diagnosed, and you were spot on with the undervoltage! They fixed it, and it cost me 240€, just like you said. Thanks again!
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VOLVO
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S40
henry_baumann91
Whoa, 'Fault memory lock active' sounds like something out of a sci-fi movie! I've got an S40 myself, and I had a similar freakout a while back. Turned out to be undervoltage messing with everything. Like when your phone's about to die and starts acting crazy? Same deal. Did you check your battery or alternator recently?