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Supported manufacturers with specific OBD2 codes:

Detailed Description of Error P0703

OBDII error code P0703 stands for "Brake Switch "B" Circuit". This code is triggered when the Powertrain Control Module (PCM) detects an issue with the brake switch "B" circuit. The brake switch "B" circuit is responsible for sending a signal to the PCM when the brake pedal is pressed, which in turn enables the brake lights and disengages the cruise control system.

The brake switch "B" circuit is usually a separate circuit from the brake switch "A" circuit, which is responsible for sending a signal to the PCM when the brake pedal is pressed to enable the brake lights. The "B" circuit is typically used to control other systems such as the automatic transmission, traction control, and stability control.

When the PCM detects an issue with the brake switch "B" circuit, it will set the P0703 code and illuminate the check engine light. This code can cause issues with the vehicle''s transmission, cruise control, and other systems that rely on the brake switch "B" circuit signal.

Possible Causes of Error P0703

  • Short circuit or open circuit in the brake switch "B" wiring
  • Corrosion or damage to the brake switch "B" connector
  • Brake switch "B" faulty or worn out
  • Brake pedal position sensor faulty or misadjusted
  • PCM faulty or software issue
  • Fuse or relay related to the brake switch "B" circuit blown or faulty
  • Wiring harness damage or chafing
  • Brake switch "B" circuit overload or high resistance

Possible Fixes for Error P0703

  • Inspect the brake switch "B" wiring and connector for signs of corrosion or damage, and repair or replace as necessary
  • Check the brake pedal position sensor and adjust or replace if faulty
  • Replace the brake switch "B" if faulty or worn out
  • Check the fuse or relay related to the brake switch "B" circuit and replace if blown or faulty
  • Use a wiring diagram to trace the brake switch "B" circuit and identify any shorts or open circuits
  • Use a scan tool to monitor the brake switch "B" circuit signal and diagnose any issues
  • Consult a professional mechanic if the issue persists after trying the above fixes
Can't find the right OBDII code in the catalog? Get professional advice from our smart assistant and find out the exact cause of the problem today!

If your car is equipped with OBD-II or EOBD, you can access over 5,000 generic OBD-II diagnostic trouble codes (DTCs). These codes cover various vehicle systems, including Powertrain (P0XXX, P2XXX, P34XX), Body (B0XXX), Chassis (C0XXX), and Network/Communication (U0XXX, U2XXX, U3XXX). Additionally, there are more than 13,500 manufacturer-specific OBD-II codes available for diagnosing issues unique to different car brands and models. Make sure you're equipped with the right tools to understand and resolve these trouble codes to keep your vehicle running smoothly.

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