Powertrain
generic / SAE
P0703
Brake Switch B Circuit
A general circuit fault on the secondary brake switch B - typically used as redundant input for safety-critical functions like cruise control cancellation and shift-interlock.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number7 / 03
Possible causes
- Open in switch or wiring high
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
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 60–250 €
- Estimated time: 0.3–1.2 h
- Component: brake switch b
- MIL / check engine light
Sources
References
sae:J2012