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DTC code page

P0719: Brake Switch B Circuit Low

Quick answer: The transmission or engine controller sees the brake-switch B input stuck low or lower than expected.

Drivers also search this fault as brake switch B circuit low, P0719 brake switch fault, transmission brake input low.

Severity: medium Family: powertrain Related paths: 6
Meaning

What P0719 usually means

P0719 means the module is not seeing a correct low-to-high transition from the brake switch B circuit. That matters more than it sounds because brake input is used for torque-converter release, shift strategy, cruise cancellation, and sometimes shift-interlock logic. A bad brake-switch signal can therefore create odd converter behavior, delayed release, cruise issues, or transmission complaints that seem unrelated until you realize the controller does not reliably know when the brake pedal is applied.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Confirm whether the brake lights work correctly and consistently because that quick check often reveals the same root problem.
  • Watch the brake-switch PID on a scan tool while pressing and releasing the pedal.
  • Ask whether cruise control, shift interlock, or converter lockup behavior changed at the same time.
Driving risk

Can you keep driving?

Usually driveable short-term, but diagnose soon if brake-light behavior, cruise cancellation, or converter release feels abnormal.

Moderate urgency: This code often allows short-term driving, but the right fix usually comes faster when you diagnose it early instead of waiting for more codes.
Symptoms

Common symptoms

  • Harsh Shifting
  • torque converter stays locked too long
  • cruise control problems
  • shift interlock issues
  • harsh coast-down feel
Likely causes

Common causes behind this code

  • Misadjusted or failing brake-light / brake-switch assembly
  • Short to ground or low-voltage fault in the brake-switch B circuit
  • Connector damage at the brake pedal switch
  • Wiring issue between the switch and control module
  • Pedal bracket or switch mount movement preventing proper travel

Cause phrases often tied to this code: brake switch, misadjusted brake light switch, wiring fault, low input.

Diagnostic order

Suggested workflow

  1. Inspect brake light operation and compare it with brake-switch data on the scan tool.
  2. Check switch adjustment and pedal free play at the bracket.
  3. Test for low-input conditions, shorts to ground, or wiring damage in the brake-switch B circuit.
  4. Repair the switch or wiring fault and confirm the module sees clean brake on/off transitions.
  5. Road-test for normal converter release and transmission behavior after the repair.
Avoid guesswork

Common mistakes

  • Ignoring a brake-switch code because the complaint feels transmission-related.
  • Replacing converter or solenoid parts before proving the module knows when the brake is applied.
Repair path

Practical fix guidance

  • Restore reliable brake input first because torque-converter and shift decisions depend on it.
  • After repair, verify brake lights, cruise cancel, and lockup release all behave normally.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P0719

Useful when the driver knows the wording but not the exact DTC yet.

  • brake switch B circuit low
  • P0719 brake switch fault
  • transmission brake input low
Related search intent

Queries this page can answer naturally

  • P0719 code meaning
  • what does P0719 mean
  • bad brake switch transmission code
FAQ

Quick questions about P0719

Can a brake-switch fault affect shifting?

Yes. Brake input is used for converter release and other control decisions, so a bad switch can create drivability complaints that feel transmission-related.