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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1278 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0571CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban K2500, 6.0 U

Circuit/System Testing

2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, verify that the Stoplamp Pedal Switch parameter in the ECM reads Applied while depressing the brake pedal.
    • If the parameter reads Released, test the brake applied signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  2. Ignition ON, release the brake pedal, verify that the Stoplamp Pedal Switch parameter reads Released.
    • If the parameter reads Applied, test the brake applied signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  3. If all circuits test normal, replace the ECM.
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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.