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 that sends this signal (look at its codes)
- CAN bus connector or wire
- Low voltage: a flat battery or corroded terminals
What you can do yourself
- Look at the engine and transmission codes: start with those.
- Check the battery and terminals: at low voltage control units lose communication.
- 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.
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.
ESC is the Hyundai and Kia stability control system (the same as ESP). This is the Hyundai and Kia meaning. On other makes this number means something else: if your car isn’t a Hyundai or Kia, change the make at the top.
Source: tat.net.au (Hyundai manufacturer codes)
The explanation comes from the error code reference in the AvtoElektrik PRO app.