P0839

Four Wheel Drive (4WD) Switch Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Fault indication on the dashboard
Inability to switch all-wheel drive modes
Incorrect operation of the all-wheel drive system
Automatic 4WD system shutdown

Causes

Short circuit to power in switch circuit
4WD switch malfunction
Wiring harness damage
Problems with the transmission control unit
Oxidation of contacts in connectors

How to Fix

Check the integrity of wiring and connectors
Test 4WD switch
Check circuit resistance
Inspect the control unit for damage
Replace switch if necessary

Related codes

P0836 P0837 P0838