DTC P0568 Cruise Control Set Switch Circuit. Chevrolet Chevy G Van 1996

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1996 🢒 Chevy G Van 🢒 Engine 🢒 Engine Controls - 6.5L 🢒 DTC P0568 Cruise Control Set Switch Circuit

Engine Controls Components
Cruise Control Switch, Wastegate Solenoid, and APP Module
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The cruise Set/Coast switch is an input to the fuel control portion of the PCM. These inputs allow the PCM to control and hold a requested speed. A Cruise Set/Coast switch sends an ignition voltage signal to the PCM when the Set/Coast switch is ON. This is a type D DTC.

Conditions for Setting the DTC

•	The cruise switch is OFF.

•	The ignition voltage on the Resume switch signal circuit.

•	The cruise switch is ON.

•	The Resume switch is ON for longer than 25.5 seconds.

Action Taken When the DTC Sets

•	The PCM will disallow all of the cruise inputs.

•	TCC shift schedules may be affected.

Conditions for Clearing the MIL/DTC

•	A History DTC will clear after forty consecutive warm-up cycles that the diagnostic does not fail (the coolant temperature has risen 5°C (40°F) from the start up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle).

•	Use of a Scan tool will clear the DTC codes.

Diagnostic Aids

If the Set/Coast switch is stuck in the ON position or the driver is holding the Set/Coast switch ON for longer than 25.5 seconds, DTC P0568 will set. DTC P0568 only checks the signal circuit for a short to voltage.

Test Description

The number(s) below refer to the Step number(s) on the Diagnostic Table.

This Step determines if the signal circuit is shorted to voltage.

This Step determines if the PCM or the switch is malfunctioning.

Step	Action	Value(s)	Yes	No
1	Important: Before clearing the DTCs, use the Scan Tool Capture Info in order to record the Freeze Frame and the failure records for reference, as the data will be lost when the Clear Info function is used. Was the Powertrain On-Board Diagnostic (OBD) System Check performed?	--	Go to Step 2	Go to Powertrain On Board Diagnostic (OBD) System Check
2	Connect the Scan Tool. Turn the ignition ON with the engine OFF. Turn the cruise switch OFF. Does the Scan Tool display the Set switch ON?	--	Go to Step 3	Go to Step 4
3	Turn the ignition ON. Disconnect the PCM brown 24 way connector. Probe the Set switch signal circuit at the PCM harness with a test light connected to the chassis ground. Is the test light ON?	--	Go to Step 5	Go to Step 7
4	The DTC is intermittent. If no additional DTCs are stored, refer to Diagnostic Aids. If any additional DTCs were stored, refer to the applicable DTC table(s) first. Are there any additional DTCs stored?	--	Go to the Applicable DTC Table	Go to Diagnostic Aids
5	The Resume switch signal circuit is shorted to voltage. Repair as necessary. Is the action complete?	--	Go to Step 8	--
6	Replace the PCM. Important: If the PCM is malfunctioning, the new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Is the action complete?	--	Go to Step 7	--
7	Use the Scan Tool in order to select DTC, Clear Info. Start the engine. Allow the engine to idle at the normal operating temperature. Select DTC, Specific, then enter the DTC number which was set. Operate the vehicle within the conditions for setting this DTC as specified in the supporting text. Does the Scan Tool indicate that this diagnostic Ran and Passed?	--	Go to Step 8	Go to Step 2
8	Use the Scan Tool in order to select Capture Info, Review Info. Are there any DTCs displayed that have not been diagnosed?	--	Go to the Applicable DTC Table	System OK