wolfganghofmann1

Modus start stop issues

I'm getting really annoyed with my 2012 Renault Modus diesel. It's got almost 200k kilometers on it (197463 km to be exact), and the start-stop system is completely buggered. The engine just cuts out randomly, a warning light pops up on the dash, and the error memory has a fault logged. I'm guessing it's the battery, maybe it's just getting old and tired?

The 2012 Renault Modus diesel is experiencing issues with its start-stop system, where the engine cuts out randomly, and a warning light appears. The problem is suspected to be related to the battery, possibly due to its age and condition. A load test is recommended to assess the battery's ability to deliver current under demand, as a simple voltage check is insufficient. After a workshop visit, it was confirmed that the battery was heavily discharged and defective, and replacing it resolved the issue.

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4 comment(s)

I had a similar issue with my 2014 Opel Astra, although not a diesel. The symptoms you describe sound awfully familiar. The computer is likely detecting a voltage drop and disabling the start-stop to protect the starter motor. Have you had the battery tested under load?

Tested under load? No, I just checked the voltage with a multimeter and it seemed okay. But I guess that doesn't really tell the whole story, does it? Is there a specific way to test it properly? And what else could it be if it's not the battery?

Indeed. A simple voltage check is insufficient. A load test will reveal its ability to deliver current under strain, simulating the demand when the engine restarts. While other components could contribute, such as a faulty sensor, the discharged battery remains the prime suspect. I recommend a workshop visit to perform a thorough battery test and diagnostic check.

You were spot on. Took it to the shop, and they confirmed the battery was heavily discharged and defective. New battery later, everything's working fine. Cost me 290€, which is annoying but at least it's fixed now!

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RENAULT

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MODUS