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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 825 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCRUISE CONTROL INOPERATIVE/MALFUNCTIONINGDIAGNOSTIC AIDS
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Diagnostic Aids

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Diagnostic Aids
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to SIR Caution .

Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling .

Perform the following in order to avoid misdiagnosis:

  1. Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation .
  2. Inspect for proper operation of the clutch system, if equipped with manual transmission. Refer to Clutch System Description and Operation .
  3. Observe the cruise set/coast and cruise resume/accel parameters in the scan tool PCM General Info Inputs data list while rotating the steering wheel to both stops and pressing and holding the steering wheel control switches. This will eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil.
  4. Rotate the steering wheel to both steering stops while separately activating each cruise control switch. With a scan tool, observe the associated cruise control switch parameter in the PCM General Info Inputs data list. This will help eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil.

EMI on the vehicle speed sensor signal circuit may cause erratic cruise control operation.

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

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.