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Nissan NV Fault Memory Lock Active

Hey, bit stressed! My 2020 Nissan NV with a gasoline engine is throwing a weird error. The system says 'Fault memory lock active,' and all I know is that there's some error stored in the error memory. Any ideas? I'm not super techy, so plain English, please!

A 2020 Nissan NV displayed a 'Fault memory lock active' error, indicating an issue stored in the error memory. This problem is often linked to an undervoltage situation, where the car's ECU detects a voltage drop and locks the fault memory to prevent damage. The suggested solution involves checking the battery's health and possibly using a diagnostic tool to read and clear fault codes. Ultimately, a professional assessment is recommended to identify and fix the underlying cause, which in this case was a module draining the battery.

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4 comment(s)

I also have a Nissan NV, and I experienced something similar a while back. The 'Fault memory lock active' message usually points to an undervoltage issue. Basically, the car's computer (the ECU) detected a voltage drop and locked the fault memory to prevent further damage. Have you checked your battery's health recently?

Undervoltage, huh? So, you're saying the battery might be the culprit? Is there any way to check this myself, or should I just take it straight to a mechanic?

While you can check the battery voltage with a multimeter, the 'Fault memory lock' often requires a diagnostic tool to properly read and clear the fault codes from the ECU. Also, undervoltage does not always mean the battery. It could be caused by a defective component in the car electronics. To prevent further issues and potentially more costly repairs, I'd recommend visiting a workshop for a professional assessment.

Thanks so much for the advice! I took it to a local shop, and you were spot on. Turns out, a module was draining the battery and causing the undervoltage. They fixed the module and cleared the fault codes. Cost me 240€, but at least it's sorted!

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NISSAN

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