Error code

OBD2 P0719

OBD2P0719
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Brake Switch 'B' Circuit Low.

Severity

highDo not drive until resolved, as brake lights may fail and cause accidents.

Summary

P0719 indicates a low voltage or resistance issue in the brake switch 'B' circuit, which controls the brake lamps and can affect cruise control and torque converter lock-up mechanisms.

Symptoms

  • Brake lamps not illuminating
  • Brake lamps staying on permanently
  • Torque converter lock-up mechanism failing to engage/disengage properly

Common Causes

  • Faulty or incorrectly adjusted brake light switch
  • Blown fuse(s) in the brake circuit
  • Corroded electrical connectors/wiring/bulb sockets
  • Short circuits due to wiring damage
  • Open circuits from damaged wiring/electrical connectors

Diagnosis

  1. Inspect the brake light switch for damage or incorrect adjustment.
  2. Check fuses and replace if blown.
  3. Test wiring between the brake light switch and Powertrain Control Module (PCM) for continuity and resistance issues.
  4. Disconnect control modules to check all relevant wiring thoroughly.

Fixes

  • Replace faulty brake light switch or repair damaged wiring/connectors.

FAQ

What should I do if the code persists after replacing the brake light switch?

Inspect all related wiring and connectors for damage, corrosion, or loose connections.

Can a faulty PCM cause this issue?

A failed PCM is rare but possible; it would require replacement and reprogramming if confirmed as the cause.

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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