Error code

OBD2 P0724

OBD2P0724
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Brake Switch 'B' Circuit High.

Severity

highNot recommended due to safety risks such as increased stopping distances or engine stalling.

Summary

P0724 indicates a high voltage issue with the brake switch B circuit, which is part of the torque converter/brake light switch system located near the brake pedal.

Symptoms

  • Stored trouble code and possibly an illuminated warning light
  • Failure of the brake lamps to illuminate or remain on permanently
  • Engine stalling when reducing speed or stopping due to a malfunctioning lock-up mechanism

Common Causes

  • Blown brake light fuse(s)
  • Corroded electrical connectors/wiring/bulb sockets causing high resistances
  • Short circuited wiring to battery positive
  • Poor ground connections

Diagnosis

  1. Inspect the brake light switch for damage, incorrect adjustment, and short-circuiting.
  2. Check input voltage and current when the brake pedal is depressed.
  3. Inspect wiring between the brake light switch and Powertrain Control Module (PCM) for damage or corrosion.
  4. Disconnect control modules to check continuity and resistance in all circuits.

Fixes

  • Replace the torque converter/brake light switch if faulty.— $40-$100
  • Repair or replace damaged wiring and connectors.

FAQ

How serious is P0724?

P0724 should be considered serious as it can cause severe damage to transmission components if not resolved.

What are the common mistakes when repairing this code?

The most common mistake is replacing the torque converter lock-up clutch solenoid instead of addressing issues with the brake light switch or wiring.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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