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Home >> GMC >> 2021 >> Terrain SLT, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 247 (Automatic Transmission - 6T40 (MNH MNK) Or 6T45 (MHG) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P171A-P171C >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2021 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine - Running @ Idle
  2. Transmission - Park
  3. Perform the scan tool control function: Autostart/Autostop - On and Off @ K20 Engine Control Module

    Verify the scan tool parameter:

    • Transmission Accumulator Solenoid Valve Control Circuit High Voltage Test Status = OK or Not Run
    • Transmission Accumulator Solenoid Valve Control Circuit Low Voltage Test Status = OK or Not Run
    • Transmission Accumulator Solenoid Valve Control Circuit Open Test Status = OK or Not Run
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  4. 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.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

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