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 > Automatic Transmission System: Road Test
    ROAD TEST 1. PROBLEM SYMPTOM CONFIRMATION (a) Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that the transmission does not shift up or down, or that the shift point is too high or too low, conduct the following road test referring to the autom ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2025 Copyright www.ttundra.com
    0.0337