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Test Description

WARNING: This page is about a different car, the 2005 Hummer H2. 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 a condition is present.
DTC P0568

Step Action Yes No
Schematic Reference: Cruise Control Schematics 
Connector End View Reference: Lighting Systems Connector End Views in Lighting Systems or Powertrain Control Module (PCM) Connector End Views in Engine Controls - 4.8L, 5.3L, and 6.0L
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn the cruise control On/Off switch ON.
  4. With the scan tool, observe the Cruise Set/Coast Switch parameter in the powertrain control module (PCM) data list.
Does the Cruise Set/Coast Switch parameter display On?		 Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Disconnect C4 of the multifunction switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With the scan tool, observe the Cruise Set/Coast Switch parameter in the PCM data list.
Does the Cruise Set/Coast Switch parameter display On?		 Go to Step 4  Go to Step 5 
4 Test the cruise control set/coast 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 C4 of the multifunction switch. Refer 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 
6 Inspect for poor connections at the harness connector of the throttle actuator control (TAC) module. 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 
7 Replace the TAC module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 9  -
8 Replace the multifunction switch. Refer to Multifunction, Turn Signal Switch Replacement in Steering Wheel and Column.
Did you complete the replacement?		 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.
Does the DTC reset?		 Go to Step 2  System OK
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