U0212: Perte de communication avec le calculateur de colonne de direction
Que faire
The most important practical point: on many vehicles this module is involved in releasing the electric steering lock, so the car may run now and refuse to start next time. If that applies to yours, do not park it somewhere awkward — get it looked at while it is still going.
Expect some combination of indicators, wipers, horn and steering wheel controls not working, and expect the stability control light to be on. Take that light seriously: stability control and any lane keeping or parking assistance will be unavailable, so the car will not intervene the way you are used to. Indicators or wipers not working also make the vehicle unroadworthy, so it should not be driven far like that.
Two things worth reporting. Does anything change as you turn the wheel? That points at the clockspring — the coiled ribbon cable that carries every circuit into the steering wheel, which is a known wear item and classically takes the horn and wheel buttons with it. And has any work been done involving the airbag, steering wheel or column? Those connectors are hidden behind the wheel and easily left unmated.
Ce que signifie ce code
The steering column control module has stopped being heard from. See U0200 for the block's framing.
This is the most consequential code in the block, and the reason is that the steering column is where several unrelated critical systems happen to meet. The module at the top of the column typically handles or relays the stalk switches, the horn, the steering wheel controls, the steering angle sensor's signal, and — on many vehicles — the electric steering column lock and part of the immobiliser chain.
Three consequences follow, in ascending order of seriousness.
Convenience functions stop: indicators, wipers, lights and wheel controls may become unresponsive or behave oddly. Annoying rather than dangerous, though indicators and wipers not working is a roadworthiness matter, not merely an inconvenience.
Stability control and driver assistance drop out. The steering angle sensor's signal reaches the rest of the vehicle through this area, and stability control cannot function without knowing where the wheels are pointed. Expect the stability control light on, and expect lane keeping and parking assistance to be unavailable — so the car handles as a car without those systems, which is what matters to know before relying on them.
And on vehicles with an electric column lock, the vehicle may not restart. The lock has to be commanded to release, and a module that cannot be heard cannot receive that command. A car that is running now but may not start again is the practical risk here, which is why this code is worth acting on before parking somewhere inconvenient rather than after.
The clockspring is the first physical suspect and the corpus already carries it. Every circuit reaching the steering wheel passes through a flat ribbon cable coiled inside a cassette so it can rotate — and that ribbon is a consumable that eventually cracks. A fault that changes with steering wheel position is a clockspring until proven otherwise, and the same failure classically takes the horn and the wheel controls with it.
The other genuine cause is prior work: airbags, clocksprings, columns and steering wheels are all removed for other repairs, and a connector left unmated behind a steering wheel is invisible.
Causes probables
Commencez ici
- Ruban de contact de colonne de direction défectueux · modérée
- Câblage endommagé dans la colonne de direction · modérée
- Connecteur corrodé ou mal enclenché · facile
- Connecteur de capteur débranché · facile
Moins fréquent
- Alimentation ou masse du calculateur hors service · modérée
- Câblage du bus de données endommagé · modérée
Symptômes
Composants concernés
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