A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- A fault in the unit sending the data or in its sensor
- Low voltage: a flat battery or corroded terminals
- Poor contact on the CAN bus: a corroded connector or a damaged wire
- The unit was replaced or reprogrammed but not coded to the car
What you can do yourself
- The steering may become heavy — be careful in turns.
- Read the codes stored in the unit that is sending the invalid data — the cause is usually there.
- Check the battery and terminals: at low voltage control units lose communication.
- Write the codes down, clear them and check again: after a flat battery, a repair or voltage spikes, codes that are no longer current stay in memory.
Stop and don’t drive on if:
- The instrument panel went dark or many warning lights came on at once
- Power steering is gone or the brakes don’t work as usual
OOleg’s tip: check the connector
Often the cause is simple — there is no contact in the connector (plug). Look at the connector from the back: remove the rubber seal and you will see whether a wire is corroded or has come off completely. Corrosion shows up as green deposits. Ideally, gently pull each wire towards you one at a time: a sound wire stays in place, while a corroded one simply comes off — it needs to be repaired.
Unplug and inspect connectors with the ignition off.
On Oleg’s website:Car wiring repair ↗
The explanation comes from the error code reference in the AvtoElektrik PRO app.