U0121 High Network

Lost Communication With ABS Control Module

Common Causes

Failed EBCM/ABS module
CAN bus fault to ABS module
ABS module power or ground fault

Common Symptoms

Multiple Warning Lights On Communication / Network Fault

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Quick Info

Code U0121
System Network
Severity High

Disclaimer

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

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