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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Automatic Transmission - 6T40 (MNH MNK) Or 6T45 (MHG) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P171A, P171B, Or P171C: Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
    WARNING:

    Refer to Parking Brake and Drive Wheels Warning .

  1. Ignition ON.
  2. Verify the scan tool parameters listed below do not display Malfunction when commanding the Transmission Fluid Pressure Accumulator Solenoid Valve On and Off with a scan tool.
    • Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit High Voltage Test Status
    • Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit Low Voltage Test Status
    • Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit Open Test Status
    • If Malfunction is displayed 

      Refer to Circuit/System Testing.

    • Go to next step: If Malfunction is not displayed 
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • Go to next step: If the DTC does not set 
  5. All OK.
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