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DTC U0101: Lost Communication with TCM: Procedure

WARNING: This page is about a different car, the 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0101) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the tester on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    5. Read DTCs.

      Result

      Display (DTC output) Proceed to
      U0101 A
      U0101 and other DTCs B

    B → GO TO DTC CHART 

    A → REPLACE ECM 

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