C00A8

4WD/AWD Transfer Case Unit Actuator Position Sensor B

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–444 (est.)

Symptoms

4WD/AWD lamp on dashboard
Incorrect switching of all-wheel drive modes
Locking the transfer case in one position
Reduced off-road performance

Causes

RDM position sensor malfunction
Open/short circuit in wiring harness
Contact contamination/oxidation
Mechanical damage to the actuator
Problems with ECU software

How to Fix

Diagnosis of real sensor values via scanner
Checking the integrity of the wiring harness and contacts
Replacing the position sensor (often requires disassembling the RDM assembly)
Calibrating the mechanism position after replacement
Error reset and test drive

Related codes

C00A7 C00A9 U0100