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HOMESERVICE MANUALSPONTIAC2006G6 GTP, 2D COUPE, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 315 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0564 (3.8L) - CRUISE CONTROL MULTI-FUNCTION SWITCH CIRCUITDIAGNOSTIC AIDS
2006 Pontiac G6 GTP, 2D Coupe, Standard

Diagnostic Aids

2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION Diagnostic Aids
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

With a scan tool, observe the cruise control function switch parameters, in the Body and Accessories, Cruise Control data list, while rotating the steering wheel to both steering stops and individually activating each cruise control function switch separately. This will help eliminate the possibility of an internally shorted inflatable restraint steering wheel module coil.

For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

DTC P0564 (3.8L)

Step Action Values Yes No
Schematic Reference : Cruise Control Schematics 
Connector End View Reference: Cruise Control Connector End Views  or Powertrain Control Module (PCM) Connector End Views in Engine Controls - 3.8L (L26 and L32)
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. Turn OFF the ignition.
  2. Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  3. Disconnect C277.
  4. Turn ON the ignition, with the engine OFF.
  5. With a DMM, measure the voltage of the ignition 1 voltage circuit.
Does the voltage measure at the specified value?		 B+ Go to Step 3  Go to Step 8 
3
IMPORTANT: The cruise control On/Off switch must be turned ON in order to correctly view the set/coast and the resume/accel switch resistance values with the DMM.
  1. Turn OFF the ignition.
  2. With a DMM, measure the resistance of the cruise control switch between the ignition 1 voltage circuit and the cruise control set/coast and resume/accelerate switch signal circuit.
  3. Individually activate and hold the cruise control function switches while measuring the resistance of the cruise control function switches.
Do the cruise control function switch resistance values measure between the specified values?		 Off = O.L.
On = 7.8 K Ω - 8.6 K Ω
Resume = 2.7 K Ω - 3.0 K Ω
Set = 1.2 K Ω - 1.3 K Ω		 Go to Step 5  Go to Step 4 
4 Test the cruise control set/coast and resume/accelerate switch signal circuit for the following between C277 and the cruise control switch:
  • A high resistance
  • A short to voltage
  • A short to ground

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 6 
5 Test the cruise control set/coast and resume/accelerate switch signal circuit for a high resistance, for the following between the cruise control switch and the powertrain control module (PCM):
  • A high resistance
  • A short to voltage
  • A short to ground

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 7 
6 Inspect for poor connections at the cruise control switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 9 
7 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
8 Repair the high resistance in the ignition 1 voltage circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 11  -
9 Replace the cruise control switch. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column.
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 - Go to Step 11  -
11
  1. install the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  2. Enable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling Zone 3 in SIR.
  3. Use the scan tool in order to clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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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.