OBD-II Generic Error Code P0724: How to Fix It

Q: Can I drive with code P0724?

Yes, but with caution. The brake switch may be stuck on, causing cruise control to not engage and potentially affecting shift patterns. It's best to fix it promptly to avoid transmission issues.

Q: Will P0724 clear itself?

The code may clear after repairs if the condition is intermittent, but if the fault remains, it will return. It's best to address the root cause.

Q: What is the brake switch B circuit?

The brake switch B circuit is typically the normally closed (NC) contact used by the transmission control module to detect brake application. A high voltage means it's stuck closed (indicating brakes are applied) or shorted to power.

Q: Can a bad brake switch cause transmission problems?

Yes, the TCM uses the brake signal to control torque converter lockup and shift patterns. A faulty switch can cause harsh shifts, no shift, or prevent the converter from locking.

Q: Do I need a special scanner to diagnose P0724?

Any OBD2 scanner can read the code. However, a bidirectional scanner can help test the brake switch signal in real-time.

Abstract

Error code P0724 indicates a high voltage signal in the brake switch B circuit. This means the transmission control module (TCM) detects a brake switch that is stuck in the 'on' position or a short to battery voltage, which can prevent cruise control operation and affect shifting.