P0724
PowertrainTransmissionmoderate severityTorque Converter/Brake Switch B Circuit High
What P0724 Means
The brake switch signal to the transmission controller reads high. The computer uses this input for torque converter unlock and cruise cancel.
Symptoms
- Cruise control fault
- Torque converter stays locked
- Brake light concerns
Common Causes
- Faulty brake switch
- Short to voltage in wiring
- Corroded connector
- Faulty TCM
Diagnostic Steps
- Scan for codes and freeze frame
- Verify brake switch signal with scan tool
- Inspect wiring for short to voltage
- Replace brake switch if out of spec
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Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
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Serious DIY~$100
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Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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