The P0839 trouble code indicates a high voltage condition in the Four Wheel Drive (4WD) switch circuit. Here’s what you should know:
P0839 Four Wheel Drive (4WD) Switch Circuit High
Code symptoms P0839.
1. Difficulty engaging or disengaging the 4WD system.
2. Inoperable 4WD system.
3. Malfunction indicator lamp (MIL) or Check Engine Light (CEL) may illuminate on the dashboard.
Causes of the code P0839.
1. Faulty 4WD switch.
2. Short circuit in the 4WD switch circuit.
3. Corrosion or damage to wiring or connectors in the 4WD switch circuit.
4. Issues with the 4WD control module.
5. Electrical problems in the 4WD system.
Code Solutions P0839.
1. Replace the 4WD switch if it is found to be faulty.
2. Repair or replace any damaged wiring or connectors in the 4WD switch circuit.
3. Address any issues with the 4WD control module.
4. Ensure proper electrical connections and system integrity.