U01B9

Lost Communication With Switch Input Module C

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Incorrect operation of switches in the cabin
Lack of response to pressing some switches
The indicator light on the dashboard comes on
Loss of some comfort features
Errors in the operation of vehicle electronic systems

Causes

Open or short circuit in the communication circuit
Switch input module C faulty
Connector problems or contact corrosion
ECU malfunction
Module power problems

How to Fix

Check the integrity of the communication circuit between the ECU and the module
Inspect and clean connector contacts
Check the power supply and ground of the module
Test or replace switch input module C
Check and, if necessary, update the ECU software

Related codes

U01B8 U01BA U01BB