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 > Brake Pedal: On-vehicle Inspection
    ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT BRAKE PEDAL LOAD SENSING SWITCH HINT: Do not remove the brake pedal load sensing switch from the brake pedal support assembly. When there is a malfunction in the brake pedal load sensing switch, replace the brake pedal support assembly. (a) Disconnect the b ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2026 Copyright www.ttundra.com
    0.0333