PowertrainP1B09
CautionSeverity: Caution - get it checked when you can
Battery management system (BMS) failure (Level 1)
Key terms: Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.
2Common causes
- Sensor or actuator fault
- Wiring or connector fault
- Vacuum or intake leak
- Fuel or ignition problem
- Control module fault
3Can I drive?
Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 17
| Brand | Code | Description | System |
|---|---|---|---|
| BYD | P1B09 | Open cover protection Brand | Powertrain |
| Chery | P1B09 | CC abnormal Brand | Powertrain |
| Daewoo | P1B09 | No description available | Powertrain |
| DFFS | P1B09 | Battery management system (BMS) failure Brand | Powertrain |
| DFXK | P1B09 | EPS fault: level 4 Brand | Powertrain |
| EOBD | P1B09 | Lukitusanturi Brand | Powertrain |
| GM | P1B09 | No description available | Powertrain |
| Holden | P1B09 | Drive Motor 1 Control Module System Voltage Performance Brand | Powertrain |
| Mahindra | P1B09 | No description available | Powertrain |
| Mitsubishi | P1B09 | MCU CAN timeout/Not equipped Brand | Powertrain |
| Opel | P1B09 | No description available | Powertrain |
| Peugeot | P1B09 | No description available | Powertrain |
| Proton | P1B09 | MCU CAN timeout/Not equipped Brand | Powertrain |
| Saab | P1B09 | No description available | Powertrain |
| MG (SAIC) | P1B09 | Charger Negative Temperature Sensor Circuit Short to Ground Brand | Powertrain |
| Suzuki | P1B09 | Hybrid Battery State of Cell Temperature high Error Brand | Powertrain |
| Toyota | P1B09 | Battery management system (BMS) failure (Level 1) Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 1
These 7-character codes are manufacturer-specific variants of P1B09 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P1B0973 | Contact 'Positive pole' of the contactor in control unit 'DC safety system' has a malfunction. Actuator Stuck Closed Brand | Powertrain |
6Related codes
Browse Pxxx codes or P1B0xx codes.