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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 506 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P057C or P057D >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, engine OFF, transmission in PARK position, brake pedal released, verify with a scan tool the Brake Pedal Position Sensor parameter in the Automatic Transmission Data list displays greater than 0.25 volts.
    • If less than the specified value 

      Refer to Circuit/System Testing below.

    • If greater than the specified value 
  2. Brake pedal fully applied, verify with a scan tool the Brake Pedal Position Sensor Signal parameter displays less than 4.75 volts.
    • If greater than the specified value 

      Refer to Circuit/System Testing below.

    • If less than the specified value 
  3. Brake pedal fully released, verify with a scan tool the Brake Pedal Position Sensor Learned Home Position parameter voltage is within 100 millivolts of the Brake Pedal Position Sensor parameter voltage.
    • If within the specified value 
  4. Observe the Brake Pedal Position Sensor parameter and vary the brake apply position. Verify that the Brake Pedal Position parameter transitions smoothly and does not drop out.
    • If the parameter value drops out or does not transition smoothly between 0.25-4.75 volts 

      Refer to Circuit/System Testing below.

    • If the parameter value does not drop out and transitions smoothly between 0.25-4.75 volts 
  5. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections .
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