U01B8

Lost Communication With Switch Input Module B

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Some switches in the cabin do not work
Check Engine Light Is On
Errors in other CAN bus-related systems
Intermittent operation of related functions

Causes

Broken or damaged CAN bus wires
Switch module B fault
Module power problems
Corrosion of contacts or connectors
ECU malfunction

How to Fix

Check the integrity of the CAN bus wires
Diagnose switch module B
Check the power supply and ground of the module
Inspect connectors for corrosion
If necessary, replace the switch module

Related codes

U01B7 U01B9 U0121