U0240

Lost Communication With Entrapment Control Module B

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Power windows or sunroof do not work
Error message on the dashboard
Incorrect operation of comfort systems
Disabling related security features
Check Engine light comes on

Causes

Open or short circuit in CAN circuit
Hold Control Module B Malfunction
Module power problems
Corrosion of connectors
Software error in the module

How to Fix

Check the integrity of the CAN bus wiring harness
Diagnose power supply of hold control module B
Inspect and clean module connectors
Check module functionality
Update module software
Repair only from an authorized dealer

Related codes

U0230 U0241 U0242