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

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch ON and turn the tester ON.
3. Clear the stored DTCs by selecting the following menu items on the tester: Body Electrical / Combination Meter / Trouble Codes.
4. Drive the vehicle at more than 3.1 mph (5 km/h) for at least 60 seconds.
5. Stop the vehicle.
6. Check for DTCs.

   Result

   Result	Proceed to
   DTC output	A
   DTC not output	B

B → SYSTEM IS OK 

A → See step   2