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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1605 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0568TEST DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Test Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Description
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 2:  This step determines if condition is present.
DTC P0568

Step Action Yes No
Schematic Reference: Cruise Control Schematics 
1 Did you perform A Diagnostic System Check - Cruise Control? Go to Step 2  Go to Diagnostic System Check - Cruise Control 
2 
IMPORTANT: If DTC P1518 is also set, diagnose P1518 first.
  1. Install a scan tool.
  2. Turn ON the ignition with the engine OFF.
  3. Turn OFF the cruise control switch.
  4. Observe the cruise control Set/Coast switch parameter in the PCM data list.
Does the scan tool parameter indicate that the cruise control set/coast switch is ON?		 Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Disconnect the cruise control switch harness connector.
  3. Turn ON the ignition with the engine OFF.
  4. Monitor the cruise control set/coast switch parameter with a scan tool.
Does the scan tool indicate that the cruise control set/coast switch is ON?		 Go to Step 4  Go toStep 5 
4 Test the cruise control ON switch signal circuit for a short to voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 6 
5 Inspect for poor connections at the harness connector of the cruise control switch. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 7 
6 Inspect for poor connections at the harness connector of the PCM. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
7 Replace the cruise control switch. Refer to MULTIFUNCTION, TURN SIGNAL & HAZARD SWITCH in Steering Wheel and Column.
Did you complete the repair?		 Go to Step 9  -
8
IMPORTANT: The PCM must be reprogrammed after replacement. Refer to POWERTRAIN CONTROL MODULE .
Replace the PCM. Refer to POWERTRAIN CONTROL MODULE .Did you complete the repair?		 Go to Step 9  -
9
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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.