What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
1Original wording in English
MERCEDES-BENZ
Reported code forms B12A04A
Complaint • Driving assistance system fault messages are displayed in the driver display. • The switch lighting flashes at night/in the dark. • The following fault codes are stored in the N135 – steering wheel…
Check vehicle applicability
3A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Mercedes-Benz | CLA 220 | 2027 |
| Mercedes-Benz | CLA 250+ (EV) | 2027 |
| Mercedes-Benz | CLA 250+ (EV) | 2026 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.