DTC U0100: Lost Communication with ECM / PCM "A": Description
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
The ECM communicates with the TCM using the Controller Area Network (CAN).
If there is a problem in this communication, the TCM sets the DTC
DTC DETECTION CONDITION AND TROUBLE AREA
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0100 | Following conditions are met for 1 25 seconds (1 trip detection logic)
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