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 long downhill run on the brakes
- The parking brake isn’t fully released
- A sticking caliper keeps the wheel braking
- Frequent ESP and traction control activity (wheelspin)
What you can do yourself
- Stop in a safe place and let the brakes cool for 15–30 minutes: overheated brakes work much worse.
- Don’t touch the discs or wheels — they’re hot. Check that the parking brake is released.
- On long descents use engine braking: select a lower gear.
- If one wheel gets much hotter than the others, its caliper is sticking — the brakes need repair.
If the scan tool shows the code with a suffix after a dash (for example, C0031-1D), that’s the fault detail: 01 — general electrical failure, 1D — circuit current out of range, 29 — invalid signal, 2F — erratic signal, 62 — signal doesn’t match the others.
The explanation comes from the error code reference in the AvtoElektrik PRO app.