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Home >> Buick >> 2017 >> LaCrosse Base >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - AISIN AF50-8 (MRC) >> Diagnostic Information and Procedures >> DTC P0606, P177F, P2637, or P2638: Control Module Processor/Detected Gear/Torque Calculation >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P0606, P177F, P2637, P2638 is not set.
    • If the DTC is set 
    1. Perform all necessary programming and setup procedures for the control module:K71 Transmission Control Module
    2. Verify the DTC does not set.
      • If the DTC sets - Replace the component:K71 Transmission Control Module
      • If the DTC is not set
    3. All OK.
    • If the DTC is not set 
  3. All OK.
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