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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Automatic Transmission - VT40 (MRG) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0841-P0843 or P0846-P0848 >> 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 P0641 is not set.
    • Go to next step: If the DTC is not set 
  3. Verify the scan tool parameter:
    • {P0841 - P0843} Transmission Fluid Pressure Sensor 1 = 0.2 to 4.8 V
    • {P0846 - P0848} Transmission Fluid Pressure Sensor 2 = 0.2 to 4.8 V
    • If not between 0.2 and 4.8 V 

      Refer to Circuit/System Testing

    • Go to next step: If between 0.2 and 4.8 V 
  4. Verify the scan tool parameter: Transmission Fluid Pressure Sensor 1 & Transmission Fluid Pressure Sensor 2 = The parameter value should not change.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: X1 @ T12 Automatic Transmission Assembly
    • Wiggle the harness and connector: X1 @ K71 Transmission Control Module
    • If the parameter value changes 

      Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)

    • Go to next step: If the parameter value does not change 
  5. 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 
  6. All OK.
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