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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 187 (DISC BRAKES)SYMPTOM TESTINGBRAKE WARNING INDICATOR ALWAYS ON
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Brake Warning Indicator Always On

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Brake Warning Indicator Always On
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you review the BRAKE WARNING SYSTEM DESCRIPTION & OPERATION and perform the necessary inspections? If so, go to next step. If not, see SYMPTOMS - HYDRAULIC BRAKE  under TROUBLE SHOOTING.
  2. Turn OFF the ignition for 5 seconds. Ensure the park brake is released. Turn ON the ignition while observing the brake warning indicator. Does the brake warning indicator illuminate for 3 seconds and then turn OFF? If so, condition is intermittent. See INTERMITTENTS  in SYMPTOMS - HYDRAULIC BRAKE under TROUBLESHOOTING. If not, go to next step.
  3. Install a scan tool. Select the INSTRUMENT PANEL CLUSTER SPECIAL FUNCTIONS menu on the scan tool. Command the BRAKE LAMP OFF. Does the brake warning indicator turn OFF? If so, go to next step. If not, go to step  11 .
  4. Select INPUT 1 from the BODY CONTROL MODULE DATA DISPLAY menu on the scan tool. Ensure the park brake is released. Observe the PARK BRAKE status on the scan tool. Does the scan tool display RELEASED? If so, go to next step. If not, go to step  6 .
  5. Disconnect the brake fluid level switch harness connector. Does the brake warning indicator turn OFF? If so, go to step  12 . If not, go to step  8 .
  6. Disconnect the park brake switch harness connector. Does the brake warning indicator turn OFF? If so, go to step  9 . If not, go to next step.
  7. Disconnect from the BCM, the harness connector containing the park brake switch output circuit. Test the park brake switch output circuit for a short to ground. Did you find and correct the condition? If so, go to step  14 . If not, go to step  10 .
  8. Disconnect from the EBCM, the harness connector containing the brake fluid level sensor signal circuit. Test the brake fluid level sensor signal circuit for a short to ground. Did you find and correct the condition? If so, go to step  14 . If not, go to step  13 .
  9. Replace the park brake switch. See PARK BRAKE WARNING LAMP SWITCH  under REMOVAL & INSTALLATION. After repairs are complete, go to step  14 .
  10. Replace the BCM. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. After repairs are complete, go to step  14 .
  11. Replace the instrument panel cluster. See appropriate GAUGES & INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs are complete, go to step  14 .
  12. Replace the brake fluid level switch. See MASTER CYLINDER RESERVOIR  under REMOVAL & INSTALLATION. After repairs are complete, go to step  14 .
    13. NOTE: For vehicles not equipped with Brake Warning Indicator System (UJ1), go to  14 .
  13. Repair the short to ground in the brake warning indicator control circuit. After repairs are complete, go to step  15 .
  14. Replace the EBCM. See appropriate ELECTRONIC BRAKE CONTROL MODULE (EBCM) REPLACEMENT in ANTI-LOCK BRAKE SYSTEM article. Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure. Did you complete the replacement? If so, go to next step.
  15. Turn OFF the ignition for 5 seconds. Ensure the park brake is released. Turn ON the ignition while observing the brake warning indicator. Does the brake warning indicator illuminate for 3 seconds and then turn OFF? If so system is okay. If not, go to step  2 .
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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.