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HOMESERVICE MANUALSPONTIAC2006GRAND PRIX GTREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESDTC P0608DIAGNOSTIC AIDS
2006 Pontiac Grand Prix GT

Diagnostic Aids

2006 Pontiac Grand Prix GTSECTION Diagnostic Aids
DTC P0608

Step Action Value(s) 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
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 the ignition OFF.
  2. Install a scan tool.
  3. Raise the vehicle drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Start the engine.
  5. Place the transmission into drive.
  6. With a scan tool, observe the Vehicle Speed Sensor parameter in the Body and Accessories, Cruise Control data list.
Does the Vehicle Speed Sensor parameter indicate any vehicle speed?		 - Go to Step 4  Go to Step 3 
3 Is DTC P0502 or P0503 current in the PCM? - Go to Diagnostic Aids Go to Step 7 
4
  1. Turn OFF the ignition.
  2. Disconnect the throttle actuator control (TAC) module.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the vehicle speed signal circuit to a good ground.
Does the voltage measure greater than the specified value?		 8.5 V Go to Step 5  Go to Step 6 
5 Test the vehicle speed signal circuit for a short to voltage. 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 8 
6 Test the vehicle speed signal circuit for an open or for 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 
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 9 
8 Inspect for poor connections at the harness connector of the TAC module. 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 
9 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  -
10 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 11  -
11
  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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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.