C0099

4WD/AWD Rear Differential Unit Actuator A Position Sensor A

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Incorrect operation of the all-wheel drive system
The vehicle enters rear-wheel drive (RWD) mode.
Reduced dynamics and controllability

Causes

Actuator position sensor malfunction
Open or shorted wiring harness
Problems with the rear differential actuator
Corroded or damaged contacts
Software error in the control unit

How to Fix

Check the condition of the wiring harness and contacts
Test the actuator position sensor
Check the operation of the rear differential actuator
Replace a faulty sensor or actuator
Update control unit software

Related codes

C0098 C0100 C0101