P0703 - Brake Switch B Circuit
The ECM detected a fault in brake switch B circuit.
Treat the code as the starting point: compare symptoms, likely causes, and repair paths before pricing parts or moving into an estimate.
Code Overview
The ECM detected a fault in brake switch B circuit.
Common Causes
- Transmission sensor, solenoid, or switch fault
- Damaged wiring or connector
- Internal transmission or control-module issue
Diagnostic Steps
- Check transmission fluid condition and supporting codes
- Inspect the related connector and harness
- Compare commanded operation to live scan data if supported
Likely Repairs & Cost Guides
Use symptoms, scan data, and quick checks to confirm the likely repair path before pricing parts. The estimator helps compare repair paths before replacing anything unnecessarily.
Continue EstimateRelated OBD Codes
Browse nearby code-family pages when the same fault pattern overlaps across systems, such as misfire, lean fuel trim, EVAP sealing, cooling, or charging faults.
Next Steps
Move from code lookup to diagnosis, then estimate the likely repair only after symptoms, causes, and checks point to the same path.