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ralfschaefer73

S60 ECU Fault Memory Lock

My 2016 Volvo S60 diesel's ECU keeps logging "Fault memory lock active". Error stored in the error memory. Anyone seen this before? I'm leaning towards undervoltage. Car has only done 24421 km.

Summary of the thread

A 2016 Volvo S60 diesel is experiencing an "ECU Fault memory lock active" error, suspected to be caused by undervoltage. The issue does not affect performance but is persistent and annoying. After checking the battery and running diagnostics, undervoltage was confirmed as the cause. A workshop visit resolved the issue by clearing the fault, confirming the initial suspicion.

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4 comment(s)

selinaknight18

I had a similar issue with my S60. Is it affecting performance, or just showing the error? Have you checked your battery lately? What about any recent work on the car's electrics?

ralfschaefer73 (community.author)

Performance seems fine. Just the annoying error. I did check the battery, seems okay at first glance. I also ran some ECU diagnostics, and got undervoltage readings. So, you reckon it was something similar in your case?

selinaknight18

Yes, sounds very familiar. I messed about trying to clear codes, chasing ghosts. In the end, a trip to the workshop sorted it. Cost me about 240€. Might be worth getting it properly diagnosed before you start throwing parts at it.

ralfschaefer73 (community.author)

Appreciate the insight. Ended up being exactly what you said – undervoltage screwing with the ECU. Workshop confirmed, cleared the fault, and all's good now. 240€ lighter, but at least the car's happy.

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VOLVO

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S60