U0100Severity: High
U0100 – Lost Communication With ECM/PCM
Modules can't communicate with the engine control unit over CAN.
What it means
One or more modules lose communication with the engine/powertrain control module (ECM/PCM) over the data bus (CAN). No-start or multiple warning lights can appear.
Symptoms
- Multiple warning lights
- No-start/sudden stall
- Gauge problems
- Limp mode
Common causes
- CAN bus wiring fault
- ECM/PCM power/ground issue
- Faulty module
- Connector/corrosion
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Frequently asked questions
What does trouble code U0100 mean?
U0100 – Lost Communication With ECM/PCM. One or more modules lose communication with the engine/powertrain control module (ECM/PCM) over the data bus (CAN). No-start or multiple warning lights can appear.
Can I drive with a U0100 code?
This code is high severity. Driving for long can damage the engine; have it checked as soon as possible.