C00A4

Driveline Control Module Rear Differential Unit B Control Circuit Driver

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Unstable operation of the rear differential
Check Engine Light Illuminates
Reduced efficiency of the all-wheel drive system

Causes

Open or short circuit in wiring harness
Control solenoid malfunction
Problems with the rear differential control module
Contact corrosion

How to Fix

Check the wiring harness for opens and shorts
Check control solenoid resistance
Diagnose the rear differential control module
Replace faulty components

Related codes

C00A3 C00A5 C00A6