PowertrainP0703
CautionSeverity: Caution - get it checked when you can
Torque Converter/Brake Switch B Circuit
Key terms: SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
This range normally covers the transmission control system, but some manufacturers use P07-P09 codes for unrelated functions (fuel pump control, air-mix motors, lighting or windows). Check the description before assuming it is a transmission fault.
2Common causes
- Low or dirty transmission fluid
- Faulty shift solenoid
- Faulty speed sensor
- Wiring or connector fault
- Internal transmission wear
3Can I drive?
The braking system may be affected. Have it checked promptly; if the pedal feels abnormal, the car pulls when braking, or a brake warning light is on, stop safely.
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 37
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0703 | Torque Converter/Brake Switch B Circuit SAE | Powertrain |
| BAIC Motor | P0703 | Brake Switch B Circuit Brand | Powertrain |
| Mercedes-Benz | P0703 | Torque Converter/Brake Switch B Circuit SAE | Powertrain |
| BMW | P0703 | Torque Converter/Brake Switch B Circuit Brand | Powertrain |
| BYD | P0703 | Brake Switch B Circuit Brand | Powertrain |
| Chery | P0703 | Brake Switch B Circuit Brand | Powertrain |
| Chrysler | P0703 | Brake Switch 2 Performance Brand | Powertrain |
| Daewoo | P0703 | Brake Pedal Signal Brand | Powertrain |
| DFFS | P0703 | Brake switch fault Brand | Powertrain |
| DFFX | P0703 | Brake Switch B Circuit Brand | Powertrain |
| DFXK | P0703 | Brake Switch B Circuit Brand | Powertrain |
| EOBD | P0703 | Litar suis brek 'B' Brand | Powertrain |
| Fiat | P0703 | Brake switch 2 performance Brand | Powertrain |
| Geely | P0703 | Brake Switch B Circuit Brand | Powertrain |
| GM | P0703 | Brake Switch B Circuit Brand | Powertrain |
| Great Wall | P0703 | Brake Switch B Circuit Brand | Powertrain |
| Hafei | P0703 | Brake Switch B Circuit Brand | Powertrain |
| Holden | P0703 | Brake Switch Circuit Brand | Powertrain |
| Honda | P0703 | Torque Converter/Brake Switch B Circuit SAE | Powertrain |
| Hyundai | P0703 | Torque Converter/Brake Switch B Circuit SAE | Powertrain |
| Isuzu | P0703 | Torque Converter/Brake Switch B Circuit SAE | Powertrain |
| Land Rover | P0703 | Related faults Brand | Powertrain |
| Mitsubishi | P0703 | Brake switch Brand | Powertrain |
| Nissan | P0703 | Torque Converter/Brake Switch B Circuit SAE | Powertrain |
| Opel | P0703 | Brake Switch B Circuit Brand | Powertrain |
| Peugeot | P0703 | Torque Converter/Brake Switch B Circuit SAE | Powertrain |
| Porsche | P0703 | Torque Converter/Brake Switch B Circuit SAE | Powertrain |
| Proton | P0703 | Brake switch Brand | Powertrain |
| Saab | P0703 | Brake Switch B Circuit Brand | Powertrain |
| MG (SAIC) | P0703 | Brake Switch B Circuit Brand | Powertrain |
| Smart | P0703 | Torque Converter/Brake Switch B Circuit SAE | Powertrain |
| Sprinter | P0703 | ENV_ _Datum2 Brand | Powertrain |
| Subaru | P0703 | Brake Switch Circuit Malfunction for AT Brand | Powertrain |
| Suzuki | P0703 | Brake Switch 'B' - Signal Compare Failure Brand | Powertrain |
| Tata | P0703 | Brake Switch 'B' Circuit Brand | Powertrain |
| Toyota | P0703 | Brake light switch (BLS) circuit open Brand | Powertrain |
| Volkswagen | P0703 | Brake switch (F): electrical malfunction; 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 4
These 7-character codes are manufacturer-specific variants of P0703 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P070300 | Das Signal 2 vom Schalter 'Bremslicht' hat einen elektrischen Fehler. Brand | Powertrain |
| Sprinter | P070300 | Das Signal 2 vom Schalter 'Bremslicht' hat einen elektrischen Fehler. Brand | Powertrain |
| SsangYong | P070300 | CAN communication fault: stop lamp switch Brand | Powertrain |
| Volkswagen | P070300 | Brake light switch -F Brand | Powertrain |
6Related codes
Browse Pxxx codes or P070xx codes.