C0291

Lost Communications With BCM

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Failure of body systems (lighting, power windows, central locking)
Inability to control body functions
Check engine light on

Causes

Open circuit between ECU and BCM
Damaged wiring harness
BCM malfunction
Poor fixation of connectors
BCM power problems

How to Fix

Check the integrity of the wiring harness between the ECU and BCM
Make sure the connectors are securely connected
Check BCM supply voltage
Test the BCM on another vehicle (if possible)
Replace BCM if faulty

Related codes

U0100 U0101 U0121