S550 with error code e001485-07 - Main ECU relay fault

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Tony550

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Joined
Jan 16, 2026
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Every time I start it from a cold start, the moment I turn the key to the on position with the glow plugs, the code would appear and when I turn on the engine, the code will still stay there.

But the moment I turn the key to the on/glow plugs position then turn it off and turn it back on and start the engine, the code doesn’t appear at all. No faults will show up.

Has anyone seen this before? I’ve even tried to replace the ECU relay, but still same problem. Even though the fault code is there, everything runs just fine.
 

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