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What Does P0703 Code Mean?

OBD-II Code P0703 is defined as a Brake Switch "B" Circuit

The Brake Switch tells the engine control module (PCM) that the brake pedal is depressed. This switch also controls the brake lights. If the PCM detects an implausible signal from the Brake Switch, the PCM will set code P0703.

P0703 Symptoms

  • Brake lights may not illuminate
  • Cruise control will not operate

Common Problems That Trigger the P0703 Code

  • Brake switch failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue
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