Mercedes-Benz fault codes
20,291 codes · 1,724 vehicle records · 258 ECU records · 56,350 live-data parameters
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Codes 20,291
| Code | Description | Brands | System |
|---|---|---|---|
| B121207 | Der Stellmotor für Luftverteilungsklappe vorn links hat Funktionsstörung. Es liegt ein mechanischer Fehler vor. | 2 | Body |
| B121249 | The actuator motor for the left front air distribution flap has a malfunction. There is an internal electrical fault. | 1 | Body |
| B121251 | Der Stellmotor für Luftverteilungsklappe vorn links hat Funktionsstörung. Das Bauteil ist nicht programmiert. | 1 | Body |
| B121287 | Der Stellmotor für Luftverteilungsklappe vorn links hat Funktionsstörung. Botschaft fehlt. | 2 | Body |
| B1213 | PTC heating component fault | 22 | Body |
| B121349 | The actuator motor for the right front air distribution flap has a malfunction. There is an internal electrical fault. | 1 | Body |
| B121351 | Der Stellmotor für Luftverteilungsklappe vorn rechts hat Funktionsstörung. Das Bauteil ist nicht programmiert. | 1 | Body |
| B121387 | Der Stellmotor für Luftverteilungsklappe vorn rechts hat Funktionsstörung. Botschaft fehlt. | 1 | Body |
| B1214 | Passenger Seatbelt Retractor Pretensioner Deployment Control | 21 | Body |
| B121449 | The actuator motor for the left rear air distribution flap has a malfunction. There is an internal electrical fault. | 1 | Body |
| B121451 | The actuator motor for the left rear air distribution flap has a malfunction. The component is not programmed. | 1 | Body |
| B121487 | Der Stellmotor für Luftverteilungsklappe hinten links hat Funktionsstörung. Botschaft fehlt. | 1 | Body |
| B1215 | External Memory Card | 22 | Body |
| B121549 | The actuator motor for the right rear air distribution flap has a malfunction. There is an internal electrical fault. | 1 | Body |
| B121551 | The actuator motor for the right rear air distribution flap has a malfunction. The component is not programmed. | 1 | Body |
| B121587 | Der Stellmotor für Luftverteilungsklappe hinten rechts hat Funktionsstörung. Botschaft fehlt. | 1 | Body |
| B1216 | Tailgate latch close microswitch | 19 | Body |
| B1217 | Passive Key-in Ignition Output | 19 | Body |
| B1218 | No data flow in electronic stability program | 18 | Body |
| B1219 | Semi-automatic parking system electric power steering (EPS) status information failure | 19 | Body |
| B121987 | The electrical fine particle filter has a malfunction. The message is missing. | 1 | Body |
| B121A | Keypad Illumination Output | 16 | Body |
| B121A07 | Electrical expansion valve 'Heat exchanger for cooling the high-voltage battery' has a malfunction. There is a mechanical fault. | 1 | Body |
| B121A49 | Electrical expansion valve 'Heat exchanger for cooling the high-voltage battery' has a malfunction. There is an internal electrical fault. | 1 | Body |
| B121A87 | Electrical expansion valve 'Heat exchanger for cooling the high-voltage battery' has a malfunction. The message is missing. | 1 | Body |
| B121A98 | Electrical expansion valve 'Heat exchanger for cooling the high-voltage battery' has a malfunction. The component or the system has overtemperature. | 1 | Body |
| B121B49 | Electrical expansion valve 'Exterior heat exchanger' has a malfunction. There is an internal electrical fault. | 1 | Body |
| B121B87 | Electrical expansion valve 'Exterior heat exchanger' has a malfunction. The message is missing. | 1 | Body |
| B121B98 | Electrical expansion valve 'Exterior heat exchanger' has a malfunction. The component or the system has overtemperature. | 1 | Body |
| B121C49 | The actuator motor for air flap 'Central air vent' has a malfunction. There is an internal electrical fault. | 2 | Body |
| B121C51 | The actuator motor for air flap 'Central air vent' has a malfunction. The component is not programmed. | 1 | Body |
| B121C79 | The actuator motor for air flap 'Central air vent' has a malfunction. The mechanical connection has failed. | 1 | Body |
| B121D | Rear HVAC Mode Control Input | 15 | Body |
| B121D64 | Current sensor 1 of the refrigerant compressor has a malfunction. There is an implausible signal. | 2 | Body |
| B121E | Mute Switch | 11 | Body |
| B121E49 | Current sensor 2 of the refrigerant compressor has a malfunction. There is an internal electrical fault. | 1 | Body |
| B121E64 | Current sensor 2 of the refrigerant compressor has a malfunction. There is an implausible signal. | 1 | Body |
| B121F | Automatic vehicle speed adjustment request status and received information failure | 11 | Body |
| B121F49 | Voltage sensor 1 of the refrigerant compressor has a malfunction. There is an internal electrical fault. | 1 | Body |
| B121F64 | Voltage sensor 1 of the refrigerant compressor has a malfunction. There is an implausible signal. | 1 | Body |
| B1220 | Hydraulic Proportional Valve | 22 | Body |
| B122049 | Voltage sensor 2 of the refrigerant compressor has a malfunction. There is an internal electrical fault. | 1 | Body |
| B122064 | Voltage sensor 2 of the refrigerant compressor has a malfunction. There is an implausible signal. | 1 | Body |
| B1221 | Internal left front parking assist sensor failure | 23 | Body |
| B122149 | Temperature sensor 1 of the refrigerant compressor has a malfunction. There is an internal electrical fault. | 1 | Body |
| B122164 | Temperature sensor 1 of the refrigerant compressor has a malfunction. There is an implausible signal. | 1 | Body |
| B1222 | External left front parking assist sensor failure | 22 | Body |
| B122249 | Temperature sensor 2 of the refrigerant compressor has a malfunction. There is an internal electrical fault. | 1 | Body |
| B122264 | Temperature sensor 2 of the refrigerant compressor has a malfunction. There is an implausible signal. | 1 | Body |
| B1223 | Internal left rear parking assist sensor failure | 21 | Body |
Some brand data is extracted from diagnostic files and may contain manufacturer-specific wording. General SAE J2012 descriptions are used where available.