DTC U0100: Lost Communication with ECM / PCM "A": Procedure

WARNING: This page is about a different car, the 2013 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0100)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Check if DTCs are output.

Result

Display (DTC Output)	Proceed to
U0100	A
U0100 and other DTCs	B

B → See step 3

A → See step 2

REPLACE ECM. Refer to COMPONENTS
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART