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P0703 fault code: what it means

P0703: Brake switch performance fault seen by the gearbox. Shift lock or cruise problems.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. faulty brake light switch
  2. wiring fault

P0703 by make

Mercedes-Benz

Brake switch performance fault seen by the gearbox. Shift lock or cruise problems.

Usual causes: faulty brake light switch; wiring fault

Mitsubishi

Stoplight (brake) switch signal fault seen by the TCM. Shift lock and CVT control may misbehave.

Usual causes: stoplight switch; wiring fault

Not sure what P0703 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.