U0100 Critical Network

Lost Communication With ECM/PCM

Common Causes

Failed PCM
CAN bus communication fault to PCM
PCM power or ground fault
Corroded PCM connector

Common Symptoms

Multiple Warning Lights On Communication / Network Fault

Related Videos

2:59
How To Fix U0100 Trouble Code: Lost Communication with ECM/PCM A. TOP-...
Simple Car Solutions 41K views
3:10
Causes and Fixes U0100 Code: Lost Communication with ECM/PCM
HVAC Mechanic 494K views
4:40
FIX U0100 LOST COMMUNICATION WITH ECM/PCM "A"
Top 5 Auto Repairs 203K views

Was this information helpful?

Quick Info

Code U0100
System Network
Severity Critical

Disclaimer

This information is for diagnostic guidance only. Always verify repairs with a qualified technician before performing safety-critical work.

Track your repair and verify the fix with the FaultFix app

Connect an OBD2 scanner · rescan after the repair · earn a verified fix credit

App Store Google Play