AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:U0100

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"

DESCRIPTION

The engine control unit and the transmission control unit are located inside the ECM. The engine control unit intercommunicates with the transmission control ECU with the Controller Area Network (CAN).

If there is a problem in this intercommunication, the ECM sets a DTC.

DTC No. DTC Detection Condition Trouble Area
U0100

  • Following conditions are met for 1.25 seconds (1 trip detection logic):

    1. Ignition switch ON

    2. Battery voltage is 10.5 V or more

    3. No intercommunication between engine control ECU and transmission control ECU

 ECM

MONITOR STRATEGY

Related DTCs U0100: Verify communication
Required Sensors/Components (Main) ECM
Required Sensors/Components (Related) -
Frequency of Operation Continuous
Duration 1.25 seconds
MIL Operation Immediate
Sequence of Operation None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not present None
Battery Voltage 10.5 V or more
Ignition Switch ON
Starter OFF

TYPICAL MALFUNCTION THRESHOLDS

Communication between engine control ECU and transmission control ECU No communication

INSPECTION PROCEDURE

Note

Perform the universal trip to clear permanent DTCs Click here.

PROCEDURE

  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0100)

    1. Connect the Techstream to the DLC3.

    2. Turn the ignition switch to ON.

    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    4. Check if DTCs are output.

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

    GO TO DTC CHART Click here

    A

    REPLACE ECM Click here