Error code

OBD2 P0703

OBD2P0703
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Brake Switch 'B' Circuit.

Severity

moderateCan drive, but should address brake issues and TCC operation.

Summary

P0703 indicates a malfunction in the brake switch 'B' circuit, which is part of the torque converter or transmission control system. This code suggests an issue with the signal sent by the brake switch to the vehicle's computer.

Symptoms

  • Malfunction Indicator Lamp (MIL) lights up
  • Inoperative brake light and Torque Converter Clutch does not operate

Common Causes

  • Faulty Brake Switch
  • Misadjusted Brake Switch
  • Brake Switch harness is open or shorted
  • Poor electrical connection in the Brake Switch circuit

Diagnosis

  1. Check if the stop light works with the brake pedal
  2. Inspect for open or shorted wiring in the Brake Switch circuit

Fixes

  • Replace faulty brake switch

FAQ

What should I do if my brake lights are not working?

Check and adjust or replace the brake switch.

How can I verify that the issue is with the brake switch circuit?

Inspect for open or shorted wiring in the Brake Switch circuit and ensure proper electrical connections.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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