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
- The sensor connector: corrosion, water in the cabin
- The sensor itself
- The sensor’s power or ground
- The wires or CAN bus between the sensor and the ESP unit
- On many cars the sensor is built into the ABS or airbag unit — then the unit itself is at fault
What you can do yourself
- ESP and traction control, and sometimes ABS, may not work. The brakes still work, but without electronic help — on slippery roads brake smoothly and don’t accelerate hard.
- The sensor usually sits in the middle of the car — under the center console or a seat: check its connector, especially if water got into the cabin or the console was removed.
- The sensor must be mounted level and tight: if it was removed or is loose, ESP intervenes at the wrong moments.
Stop and don’t drive on if:
- The red brake light is on, or the brake pedal feels soft or sinks
- The steering became very heavy, or the car pulls to one side when braking
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.
The explanation comes from the error code reference in the AvtoElektrik PRO app.