U0663

Lost Communication With Rear Mode Actuator

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Check Engine Light Is On
The car goes into emergency mode
Loss of rear-wheel drive mode functionality
Inability to switch driving modes
Decreased performance

Causes

Open or short circuit in the rear drive mode circuit
Rear drive mode malfunction
Problems with the wiring harness or connectors
Software error in the ECU
Power or grounding problems

How to Fix

Check the integrity of the rear drive mode circuit
Inspect connectors and wiring harness for damage
Check the functionality of the rear-wheel drive mode
Scan the ECU for errors and update the software if necessary
Check circuit power and grounding

Related codes

U0662 U0664 U0665