DTC P0724 Brake Switch Circuit High Input 5.7L

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Circuit Description

The brake switch indicates brake pedal status to the powertrain control module (PCM). The brake switch is a normally-closed switch that supplies battery voltage on circuit 420 to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. When the brake pedal is released, the PCM receives a constant voltage signal. If the PCM receives a zero voltage signal at the brake switch input, and the torque converter clutch (TCC) is engaged, the PCM de-energizes the TCC solenoid valve. The PCM disregards the brake switch input for TCC scheduling if there is a brake switch circuit fault.

When the PCM detects a closed brake switch circuit (12 volts, high input) during decelerations, then DTC P0724 sets. DTC P0724 is a type C DTC.

Conditions for Running the DTC

Conditions for Setting the DTC

The PCM detects a closed brake switch circuit (12 volts) without changing for 2 seconds and the following events occur seven times:

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Diagnostic Aids

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step isolates the brake switch as a source for setting the DTC.

DTC P0724 Brake Switch Circuit High Input (5.7L)







Did you perform the Powertrain Diagnostic System Check?


Go to Step 2

Go to A Powertrain On Board Diagnostic (OBD) System Check in Engine Controls


  1. Install a Scan Tool .
  2. Turn ON the ignition, with the engine OFF.


Before clearing the DTC, use the Scan Tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the PCM.

  1. Record the DTC Failure Records.
  2. Clear the DTC.
  3. Select TCC Brake Switch on the Scan Tool .
  4. Disconnect the brake switch connector from the brake switch.

Did the TCC Brake Switch status change from Closed to Open?


Go to Step 3

Go to Step 4


Replace the brake switch. Refer to Stoplamp Switch Replacement in Hydraulic Brakes. Did you complete the replacement?


Go to Step 6



Test input circuit (CKT 420) of the brake switch for a short to power. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?


Go to Step 6

Go to Step 5


Replace the PCM. Refer to PCM Replacement/Programming in Engine Controls. Did you complete the replacement?


Go to Step 6



Perform the following procedure in order to verify the repair:

  1. Select DTC.
  2. Select Clear Info.
  3. Turn ON the ignition, with the engine OFF.
  4. Apply and release the brake pedal.
  5. Verify that the Scan Tool TCC Brake Switch status indicates Open (0 volts) for 2 seconds.
  6. Select Specific DTC.
  7. Enter DTC P0724.

Has the test run and passed?


System OK

Go to Step 1