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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 (M33 ONLY)ELECTRICAL FUNCTION CHECK
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A

Electrical Function Check

2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Electrical Function Check
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.

Perform this check first, in order to ensure the electronic transmission components are connected and functioning properly. If these components are not checked, a simple electrical condition could be mis-diagnosed.

  1. Connect the scan tool.
  2. Ensure the gear selector is in PARK and set the parking brake.
  3. Start the engine.
  4. Verify that the following scan tool data can be obtained and is functioning properly.

    Refer to Scan Tool Data List for typical data values. Data that is questionable may indicate a concern.

    • Engine Speed
    • Transmission output speed
    • Vehicle speed
    • TFP manual valve position switch
    • Transmission range
    • Commanded gear, current gear
    • PC solenoid reference current
    • PC solenoid actual current
    • PC solenoid duty cycle
    • Brake switch
    • Engine coolant temperature
    • Transmission fluid temperature
    • Throttle angle
    • Ignition voltage
    • 1-2 shift solenoid
    • 2-3 shift solenoid
    • TCC solenoid duty cycle
    • TCC slip speed
    • Secondary Fluid Pump - M33 Model Only
  5. Monitor the brake switch signal while depressing and releasing the brake pedal. The scan tool should display:
    • Closed when the brake pedal is released.
    • Open when the brake pedal is depressed.
  6. Check the garage shifts.
    1. Apply the brake pedal and ensure that the parking brake is set.
    2. Move the gear selector through the following ranges:
      1. PARK to REVERSE
      2. REVERSE to NEUTRAL
      3. NEUTRAL to DRIVE
    3. Pause 2 to 3 seconds in each gear position.
    4. Verify the gear engagements are immediate and not harsh.
    7. IMPORTANT: Harsh engagement may be caused by any of the following conditions:
    • High idle speed. Compare engine idle speed to desired idle speed.
    • Commanded low PC solenoid current. Compare PC solenoid reference current to PC solenoid actual current.
    • A default condition caused by certain DTCs that result in maximum line pressure to prevent slippage.
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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.