What Does P0724 Mean?
The torque converter or brake switch B circuit is reading a high voltage condition. This indicates the switch may be stuck in the open/high position, there is an open circuit, or the signal wire is shorted to voltage. The TCM uses this input to determine when the driver is braking to control torque converter lockup and shift scheduling. The driver may notice the torque converter not unlocking during braking or the engine stalling when coming to a stop.
Common Causes
30%
Faulty brake switch or torque converter switch stuck in the open/high position
25%
Misadjusted brake switch — too far from the pedal to actuate
20%
Open circuit or disconnected connector in the switch B circuit
15%
Broken brake switch mounting clip (common on many vehicles) allowing switch to fall out of position
10%
TCM internal input circuit fault or connector pin issue
Diagnostic Steps
1
Monitor the brake switch B status PID in live data. Press the brake pedal fully — the scan tool should show the switch changing state. A stuck-high reading confirms the fault.
2
Locate the brake switch on the brake pedal bracket. Verify it is properly mounted and not fallen out of its clip or bracket. Many vehicles use a plastic clip that commonly breaks.
3
Check the switch adjustment — with the pedal released, the switch plunger should be fully depressed by the pedal arm. With the pedal pressed, the plunger should extend and change the switch state.
4
Disconnect the switch and measure continuity across the terminals while pressing the pedal. Compare to manufacturer's normally-open/normally-closed specification.
5
If the switch is OK, check the wiring from the switch to the TCM for open circuits. Also verify that brake lights function correctly — if they share the same switch, brake light operation can help isolate the fault.
Estimated Repair Cost
$20 - $200
Parts + labor, varies by vehicle and location
The torque converter or brake switch B circuit is reading a high voltage condition. This indicates the switch may be stuck in the open/high position, there is an open circuit, or the signal wire is shorted to voltage. The TCM uses this input to determine when the driver is braking to control torque ...
The most common cause of P0724 (Torque Converter/Brake Switch B Circuit High) is: Faulty brake switch or torque converter switch stuck in the open/high position
Typical repair costs for P0724 range from $20 to $200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The TCM may not detect brake application, which can keep the torque converter locked during braking and cause the engine to stall. If the brake light circuit is also affected, other drivers may not see your brake lights. Check brake light operation immediately — if they are not working, repair before driving further.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0724 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission
Difficulty
Type
Generic (SAE)
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