Brake Switch B Circuit High
What it means
P0724 means the computer sees the brake switch B signal stuck high. The transmission uses this brake input to release the torque converter lock-up clutch and to manage functions like cruise control, so a fault can cause harsh shifts, no converter lockup, or cruise dropping out. It does not stop the engine from starting.
Can I keep driving? Usually yes, but you may notice harsh shifts, cruise control dropping out, or the torque converter not locking up; fix it soon.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Torque converter lock-up clutch not releasing or engaging properly
- Harsh or erratic shifting
- Cruise control not working or dropping out
Common causes
Most likely first
- Faulty or misadjusted brake switch BLikely
- Short to voltage in the brake switch B circuitCommon
- Corroded or loose connector in the circuitCommon
- Faulty TCM/PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Scan and watch the brake switch B input while pressing and releasing the pedal.
- Check the brake switch adjustment and operation at the pedal.
- Inspect the wiring for a short to voltage and check the connector for corrosion.
- Replace the brake switch if it does not change state correctly.
- If the switch and wiring are good, evaluate the TCM/PCM.
FAQ
Quick answers
Is it safe to drive with P0724?+
Can I just clear P0724?+
Related codes
Read & clear P0724 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.