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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 234 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0719: BRAKE SWITCH CIRCUIT - LOW INPUTDIAGNOSTIC PROCEDURE
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Diagnostic Procedure

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
    2. NOTE: 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.
  2. Install a scan tool. Turn ignition on, with engine off. Record the Failure Records. Clear the DTCs. Select TCC Brake Switch on the scan tool. Disconnect the TCC brake switch connector. Using the Connector Test Adapter Kit, install a fused jumper wire between terminals "A" and "B" of the TCC brake switch connector. Did the TCC brake switch status change from Open to Closed? If yes, go to step  5. If no, go to next step.
  3. Remove the IGN 1 fuse. Inspect the fuse for an open. Is the fuse open? If yes, go to next step. If no, go to step  6.
    4. NOTE: The condition that affects this circuit may exist in other connecting branches of the circuit.
  4. Test the TCC brake switch ignition 1 voltage circuit (CKT 1039) for a short to ground. Did you find and correct the condition? If yes, go to step  9.
  5. Inspect the TCC brake switch for proper adjustment. Adjust the TCC brake switch as necessary. See appropriate article in BRAKES. Did the TCC brake switch require adjustment? If yes, go to step  9. If no, go to step  7.
  6. Test the TCC brake switch ignition 1 voltage circuit (CKT 1039) for an open. Test the TCC brake switch signal circuit (CKT 420) for an open. Did you find and correct a condition? If yes, go to step  9. If no, go to step  8.
  7. Replace the TCC brake switch. Did you complete the replacement? If yes, go to step  9.
  8. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - DEVILLE & SEVILLE article. Did you complete the replacement? If yes, go to next step.
  9. Perform the following procedure in order to verify the repair:
    • Select DTC.
    • Select Clear Info.
    • Turn ignition on, with engine off. The TCC brake switch must be closed, pedal released, for more than 2 seconds.
    • Select Specific DTC.
    • Enter DTC P0719.

    Has the test run and passed? If yes, go to next step. If no, go to step  2.

  10. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.