U0318

Software Incompatibility With Brake System Control Module A

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

~$167 (est.)

Symptoms

Check Engine Light Is On
Error messages appearing on the dashboard
Reduced functionality of the braking system
Disabling ABS/ESP systems
Problems with cruise control

Causes

Incompatible brake module software update
Software version mismatch between ECUs
Damaged software
Problems with communication between modules
Brake control module malfunction

How to Fix

Check software versions of all related modules
Update software to compatible versions
Check the integrity of the wiring harness between the modules
Perform brake control module diagnostics
Repair only from an authorized dealer

Related codes

U0121 U0401 U0415