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HOMESERVICE MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 433 (AUTOMATIC TRANSMISSION - 4L60-E/4L65-E (TROUBLESHOOTING))TROUBLESHOOTINGROAD TEST PROCEDURE (M30/M32)NOTES
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A

Road Test Procedure (M30/M32): Notes

2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Notes
WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The Road Test Procedure should be performed only as part of the Symptom Diagnosis. Refer to Symptoms - Automatic Transmission .

The following test provides a method of evaluating the condition of the automatic transmission. The test is structured so that most driving conditions would be achieved. The test is divided into the following parts:

  • Electrical Function Check
  • Upshift Control and Torque Converter Clutch (TCC) Apply
  • Part Throttle Detent Downshifts
  • Full Throttle Detent Downshifts
  • Manual Downshifts
  • Coasting Downshifts
  • Manual Gear Range Selection
    • REVERSE
    • Manual FIRST
    • Manual SECOND
    • Manual THIRD
IMPORTANT: Complete the test in the sequence given. Incomplete testing cannot guarantee an accurate evaluation.

Before the road test, ensure the following:

During the road test:

  • Perform the test only when traffic conditions permit.
  • Operate the vehicle in a controlled, safe manner.
  • Observe all traffic regulations.
  • View the scan tool data while conducting this test.

    Take along qualified help in order to operate the vehicle safely.

  • Observe any unusual sounds or smells.

After the road test, check the following:

  • Transmission fluid level. Refer to the Transmission Fluid Checking Procedure .
  • Diagnostic Trouble Codes (DTCs) that may have set during the testing. Refer to the applicable DTC.
  • Scan tool data for any abnormal readings or data.
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.