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 wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
U142791"Implausible data were received from the control unit 'Head unit'Manufacturer communications
4Original wording in English
MERCEDES-BENZ
Reported code forms U142791
Complaint After updating MB.OS to 1.3.7, every key cycle displays consistent instrument cluster message "Driver Assistance System Functions Limited Please Drive with Caution See Operator's Manual". Note: Verify this is…
MERCEDES-BENZ
Reported code forms U142791
Complaint After updating MB.OS to 1.3.7, every key cycle displays consistent instrument cluster message "Driver Assistance System Functions Limited Please Drive with Caution See Operator's Manual". Note: Verify this is…
MERCEDES-BENZ
Reported code forms U142791
Complaint After updating MB.OS to 1.3.7, every key cycle displays consistent instrument cluster message "Driver Assistance System Functions Limited Please Drive with Caution See Operator's Manual". Note: Verify this is…
MERCEDES-BENZ
Reported code forms U142791
Complaint After updating MB.OS to 1.3.7, every key cycle displays consistent instrument cluster message "Driver Assistance System Functions Limited Please Drive with Caution See Operator's Manual". Note: Verify this is…
Check vehicle applicability
6A 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 250 | 2026 |
| Mercedes-Benz | CLA 250 4MATIC | 2026 |
| Mercedes-Benz | CLA 250+ (EV) | 2027 |
| Mercedes-Benz | CLA 250+ (EV) | 2026 |
| Mercedes-Benz | CLA 350 4MATIC (EV) | 2027 |
| Mercedes-Benz | CLA 350 4MATIC (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.