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Fault code u012100

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Old Feb 4, 2026 | 04:20 AM
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axel59
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Fault code u012100
I have a w212 220cdi 2015, this fault code is driving me insane. Its always there and does not disapear when i clear it.

the only light it gives is engine light but no abs/esp light. I have tried changing the radar behind front bumper but no luck.

cleaned all contacts and checked for faulty wires but still no luck.

i have some more codes on the esp

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Old Feb 4, 2026 | 01:39 PM
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W212 MY'14 M276-3.5NA @75kMi
english fault descriptions
Please scan the whole car then we can read the faults descriptions in english.

We need to know what each individual modules is reporting.

You say "new radars without improvement".... be aware there is a long front bumper harness connector that ends up soaked on passenger side.
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Old Feb 6, 2026 | 04:11 AM
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I will scan again and upload pictures.

the harness behind the bumber is fully dry and ive checked all conections for bad wiring, the fault is not in that harness.

the radar is for the colision prevention assist, wich is not working
Last edited by axel59; Feb 6, 2026 at 04:12 AM.
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Old Feb 6, 2026 | 04:59 AM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by axel59
I will scan again and upload pictures.

the harness behind the bumber is fully dry and ive checked all conections for bad wiring, the fault is not in that harness.

the radar is for the colision prevention assist, wich is not working
The bumper radars report through the harness you've just tested.

Lets see what faults come up ?
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Old Feb 6, 2026 | 05:10 AM
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Originally Posted by CaliBenzDriver
The bumper radars report through the harness you've just tested.

Lets see what faults come up ?



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Old Feb 6, 2026 | 06:02 AM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by axel59

based on these error screens, its pretty easy based on given context: either radar module is bad or harness connection is but you said is not bad.
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