C0023Stop Lamp Control
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Covers the stop lamp (brake light) control circuit as driven or monitored by the brake or stability control module. Modern ABS/ESC systems can command the stop lamps during autonomous braking events such as traction control, stability control and automatic emergency braking, independent of the driver pressing the pedal, and they monitor the circuit for opens, shorts and lamp-output disagreement. The code is stored when the commanded stop lamp state does not match the measured output or the circuit is faulty. Effects range from stop lamps that stay on or off to disabled driver-assist functions that rely on brake-light actuation. Mazda stores C0023:14 as a brake light circuit malfunction and names a retrofitted brake light flasher as one trigger (service alert SA-041-26). NHTSA's brake study lists brake lights on/off as a CHB output.
- What you may notice
- Stop lamps stay on or do not light
- Stability or driver-assist functions disabled
- ABS or stability warning lamp on
- Likely causes
- LikelyOpen or shorted stop lamp wiring
- PossibleFailed lamp or output driver
- RareFaulty brake switch signal
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.