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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P171A, P171B, P171C: Transmission Accumulator Solenoid Valve Control Circuit >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify DTC P0658, P0659 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Clear DTCs
  4. Perform the scan tool control function: Transmission Accumulator Solenoid Valve - On and Off

    Verify the scan tool parameter:

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

      Refer to Circuit/System Testing

    • Go to next step: If the specified state 
  5. Perform the scan tool control function: Transmission Accumulator Solenoid Valve - On and Off

    Verify a click can be heard or felt at the component when it is turned On and Off:

    • If a click cannot be heard or felt 

      Refer to Circuit/System Testing

    • Go to next step: If a click can be heard or felt 
  6. 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 
  7. All OK.