P0724
Brake Switch B Circuit High
Transmission
Generic OBD-II
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.
High
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.
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?+
Generally yes, but the transmission may shift harshly or the torque converter may not lock up, and cruise control may not work. Repair it soon.
Can I just clear P0724?+
You can, but if the brake switch or wiring is at fault the code returns and the shift and cruise symptoms remain.
Related codes
Often seen with P0724
Read & clear P0724 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX