Brake Switch B Circuit Low
Brake Switch B Circuit Low: the signal voltage is below the expected range. Often a short to ground or high resistance in the wiring.
Affected components
- Brake switch
- Switch wiring
Common causes
- High likelihood: Brake switch defective
- Medium likelihood: Wiring shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.