Code U0100 – Lost Communication with ECM/PCM? Here’s What to Check First
Автор: Quick & Fun Tech Tips
Загружено: 2025-05-30
Просмотров: 184
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Getting a U0100 code? That means the vehicle has lost communication with the ECM/PCM, one of the most critical modules in the system. But don’t panic, this doesn’t always mean the computer is bad.
In this video, I break down what U0100 (Lost Communication with ECM/PCM) really means, why it shows up, and what you should check before replacing any parts. Common causes include:
• Power or ground issues at the ECM
• Faulty or corroded connectors
• CAN bus wiring problems
• Aftermarket accessories interfering with communication
I’ll walk you through the first diagnostic steps to take, and how to avoid getting misled by this implausible communication fault.
If you're chasing a no-start, random electrical issues, or multiple U-codes, this is the place to start.
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