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DTC code page

P0724: Brake Switch B Circuit High

Quick answer: The brake-switch B circuit is reading high or stuck on when it should not.

Drivers also search this fault as brake switch B circuit high, P0724 brake switch stuck on, transmission brake input high.

Severity: medium Family: powertrain Related paths: 6
Meaning

What P0724 usually means

P0724 is the high-input counterpart to P0719. The controller sees the brake-switch B circuit stuck high, active too often, or not returning to its normal state. That can interfere with torque-converter lockup, cruise control, brake-pedal logic, and shift strategy because the module may think the brake is being applied when it is not. It is usually an electrical or switch-adjustment problem, not a sign of internal transmission damage.

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

  • Check whether the brake lights stay on or act oddly with light pedal movement.
  • Watch the brake-switch PID and confirm whether it remains active when the pedal is released.
  • Ask whether cruise control now cancels unexpectedly or converter lockup seems absent.
Driving risk

Can you keep driving?

Usually not an immediate no-drive fault, but it should be fixed promptly if brake lights stay on, cruise becomes unreliable, or converter behavior is obviously wrong.

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
  • converter won’t stay locked
  • cruise control drops out
  • brake lights stay on
  • weird coast-down behavior
Likely causes

Common causes behind this code

  • Brake switch adjusted too far or mechanically sticking
  • Open circuit or high-voltage fault keeping the B input active
  • Short to voltage or control-module input fault
  • Brake-light switch connector issue or damaged wiring
  • Pedal return problem keeping the switch from resetting

Cause phrases often tied to this code: brake switch stuck on, switch adjustment, open circuit, high input.

Diagnostic order

Suggested workflow

  1. Verify brake-light behavior and scan-tool brake input status with the pedal released and applied.
  2. Inspect switch adjustment, mounting, and pedal return spring behavior.
  3. Check for high-input conditions, shorts to voltage, or wiring faults in the circuit.
  4. Repair the switch or wiring issue and confirm the signal returns low when the pedal is released.
  5. Road-test for normal cruise and converter behavior afterward.
Avoid guesswork

Common mistakes

  • Calling it a converter or lockup problem before checking whether the controller falsely thinks the brake is on.
  • Replacing transmission parts because the symptom shows up at highway speed where lockup matters most.
Repair path

Practical fix guidance

  • Correct the brake-switch input problem first, then re-evaluate any remaining lockup complaint.
  • Verify both brake-light operation and scan-tool brake-input status before closing the job.
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 P0724

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

  • brake switch B circuit high
  • P0724 brake switch stuck on
  • transmission brake input high
Related search intent

Queries this page can answer naturally

  • P0724 code meaning
  • what does P0724 mean
  • brake switch B high input
FAQ

Quick questions about P0724

Can P0724 stop torque-converter lockup?

Yes. If the controller thinks the brake is applied, it may cancel or prevent converter lockup even when the transmission itself is fine.