Toyota Tundra Service Manual: Lost Communication with ECM / PCM "A" (U0100)

Toyota Tundra Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Lost Communication with ECM / PCM "A" (U0100)

DESCRIPTION

The combination meter communicates with the ECM via the CAN line.

DTC Code

DTC Detection Condition

Trouble Area

U0100

When either of following conditions is detected:

  • Vehicle speed 5 km/h (3 mph) or more and IG voltage 10.5 V or more
  • No communication with ECM continues for 3 seconds or more (No communication to ECM or skid control ECU continues for 60 seconds or more)

CAN communication system

WIRING DIAGRAM

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs and note any codes that are output (See page ).

(b) Clear the DTC (See page ).

(c) Recheck for DTC (See page ).

Result

Result

Proceed to

DTC U0100 is not output

A

DTC U0100 is output

B

HINT:

If the CAN communication system DTC U0100 and another DTC are output at the same time, perform troubleshooting for the CAN communication system DTC U0100 first.

A

USE SIMULATION METHOD TO CHECK

B

Go to CAN COMMUNICATION SYSTEM

    Lost Communication with Front Camera Module (U023A)

    Lost Communication with Brake System Control Module (U0129)

    See More:

    Toyota Tundra Service Manual > Suspension: Front Stabilizer Bar
    ComponentsCOMPONENTS ILLUSTRATION InspectionINSPECTION PROCEDURE 1. INSPECT FRONT STABILIZER LINK ASSEMBLY LH (a) Temporarily install the nut, and flip the ball joint stud back and forth 5 times as shown in the illustration. (b) Use a torque wrench to turn the nut continuously at a rate of 2 to 3 s ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2026 Copyright www.ttundra.com
    0.0098