PowertrainP0651
SeriousSeverity: Serious - have it checked soon
Sensor Reference Voltage B Circuit/Open
Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine computer or one of its output circuits has a fault.
2Common causes
- Engine control module fault
- Power or ground connection problem
- Low battery or charging voltage
- Wiring short or open circuit
- Software or memory fault
3Can I drive?
Serious · drive with care
If the engine runs normally, drive carefully to a workshop for diagnosis. If it runs badly, stalls, or will not restart, have the car towed.
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 39
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| BAIC Motor | P0651 | SVS indicator circuit fault Brand | Powertrain |
| Mercedes-Benz | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| BYD | P0651 | DMS and speed sensor supply fault Brand | Powertrain |
| Chery | P0651 | Sensor power supply 2 Brand | Powertrain |
| Chrysler | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Daewoo | P0651 | 5V reference circuit 2 low voltage Brand | Powertrain |
| Daihatsu | P0651 | Sensor reference voltage B circuit/open Brand | Powertrain |
| DFFS | P0651 | 5 Volt Reference 1 Fault Brand | Powertrain |
| DFFX | P0651 | Reference voltage B amplitude fault Brand | Powertrain |
| DFXK | P0651 | ETC reference voltage B#range fault Brand | Powertrain |
| EOBD | P0651 | Anduri viitepinge 'B' vooluring/avatud Brand | Powertrain |
| Ford | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Geely | P0651 | DMS and Speed Sensor Power Supply Fault Brand | Powertrain |
| GM | P0651 | 5 volt reference 2 circuit Brand | Powertrain |
| Great Wall | P0651 | DMS and speed sensor supply fault Brand | Powertrain |
| Hafei | P0651 | Sensor Reference Voltage B Circuit/Open Brand | Powertrain |
| Holden | P0651 | Sensor Reference Voltage 2 Circuit Brand | Powertrain |
| Honda | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Hyundai | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Isuzu | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Land Rover | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Mahindra | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Maserati | P0651 | Sensor Reference Voltage 2 Circuit Brand | Powertrain |
| Mazda | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Mitsubishi | P0651 | Sensor reference voltage2 Brand | Powertrain |
| Opel | P0651 | 5 volt reference 2 circuit Brand | Powertrain |
| Perodua | P0651 | Sensor reference voltage B circuit/open Brand | Powertrain |
| Peugeot | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Porsche | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Proton | P0651 | Sensor reference voltage2 Brand | Powertrain |
| Saab | P0651 | 5 Volt Reference 2 Circuit Brand | Powertrain |
| MG (SAIC) | P0651 | Sensor Reference Voltage B Circuit/Open Brand | Powertrain |
| Sprinter | P0651 | Sensor Reference Voltage B Circuit/Open SAE | Powertrain |
| Suzuki | P0651 | Sensor Reference Voltage 'B' Circuit / Open Brand | Powertrain |
| SWM Motor | P0651 | SVS indicator circuit failure Brand | Powertrain |
| Tata | P0651 | Supply For Sensor 2 Brand | Powertrain |
| Toyota | P0651 | Electronic Throttle Control (ETC) reference voltage B amplitude fault Brand | Powertrain |
| Volkswagen | P0651 | Sensor reference voltage B: open circuit; Defective 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 14
These 7-character codes are manufacturer-specific variants of P0651 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P065100 | Sensor Reference Voltage 'B' Circuit/Open Brand | Powertrain |
| SsangYong | P065100 | Reference Voltage Sensor supply 2 Open Circuit Brand | Powertrain |
| Volkswagen | P065100 | Sensor reference voltage B open circuit Brand | Powertrain |
| Mercedes-Benz | P065104 | Der Ausgang 2 für Referenzspannung der Sensoren hat einen elektrischen Fehler oder Unterbrechung. Es liegt ein interner Fehler vor. Brand | Powertrain |
| Mercedes-Benz | P065111 | Output 2 for the reference voltage of the sensors has an electrical fault or an open circuit. There is a short circuit to ground. Brand | Powertrain |
| Mercedes-Benz | P065112 | Output 2 for the reference voltage of the sensors has an electrical fault or an open circuit. There is a short circuit to positive. Brand | Powertrain |
| Mercedes-Benz | P065116 | Der Ausgang 2 für Referenzspannung der Sensoren hat einen elektrischen Fehler oder Unterbrechung. Der Grenzwert für elektrische Spannung ist unterschritten. Brand | Powertrain |
| Mercedes-Benz | P065117 | Der Ausgang 2 für Referenzspannung der Sensoren hat einen elektrischen Fehler oder Unterbrechung. Der Grenzwert für elektrische Spannung ist überschritten. Brand | Powertrain |
| Mercedes-Benz | P065141 | Der Ausgang 2 für Referenzspannung der Sensoren hat einen elektrischen Fehler oder Unterbrechung. Es liegt ein allgemeiner Prüfsummenfehler vor. Brand | Powertrain |
| Mercedes-Benz | P065192 | Output 2 for the reference voltage of the sensors has an electrical fault or an open circuit. The function or the instruction is faulty. Brand | Powertrain |
| Mercedes-Benz | P065198 | Der Ausgang 2 der Referenzspannung für Sensoren hat einen elektrischen Fehler oder Unterbrechung. Die Komponente oder das System hat Übertemperatur. Brand | Powertrain |
| Sprinter | P065198 | Der Ausgang 2 für Referenzspannung der Sensoren hat einen elektrischen Fehler oder Unterbrechung. Die Komponente oder das System hat Übertemperatur. Brand | Powertrain |
| Mercedes-Benz | P0651A2 | Output 2 for the reference voltage of the sensors has an electrical fault or an open circuit. The system voltage is too low Brand | Powertrain |
| Mercedes-Benz | P0651A3 | Output 2 for the reference voltage of the sensors has an electrical fault or an open circuit. The system voltage is too high Brand | Powertrain |
6Related codes
Browse Pxxx codes or P065xx codes.