P279E

Four Wheel Drive (4WD) Range Signal Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$28–167 (est.)

Symptoms

Flashing 4WD light on dashboard
Inability to switch between drive modes (2WD, 4H, 4L)
System gets stuck in one drive mode
Reduced dynamics or strange behavior of the car when driving
Other related trouble codes may appear

Causes

Faulty transfer case range position sensor
Open or short circuit in range signal circuit
Problems with the solenoid valve or mode switching motor
Mechanical faults in the linkage of the transfer case
Four-wheel drive control module or TCM malfunction

How to Fix

Read fault codes and freeze frame data using a scanner
Visually inspect the wiring harness and sensor/module connectors for damage.
Check the resistance and reference voltage of the range position sensor
Check operation of solenoid valves or shift actuators
If necessary, replace the position sensor or control module

Related codes

P279F P2800 P2801