What is the P0839 error code? What is the description for the All Wheel Drive (4WD), Switch Circuit High fault How do I fix the P0839 fault code What are the symptoms and causes for the P0839 fault code
What is the P0839 Fault code? What does it all mean?
Fault code 0839 is only applicable to vehicles with all-wheel drive (4WD). If the powertrain controller module (PCM), detects a problem with the 4WD switch, P0839 will be issued.
Four-wheel drive (4WD), switch circuits are responsible for P0839, Fault Codes P0836 and P0837 as well P0837 and P0838. This circuit is also known to be the intermediate transmission controller circuit. The 4WD switch circuit has the task of changing the transmission gear ratios according to the situation. It can be used to set the four wheel drive ratios at two, four, or six wheels. Triggers are activated when the PCM (or transmission control module (TCM), detects that the voltage signal from the 4WD switchcircuit is significantly higher than the expected range.
There are many models of Chryslers, Fords, Jeeps, General Motors Dodges Chevrolets and Mercedes that are susceptible to the P0839 fault code.
What is the P0839 Fault Code and Why Does It Happen?
Here are some reasons why P0839 should be set.
- – Broken, damaged, melted, or broken wires, loose connectors and open circuits
- 4WD Switch Defective
- – Defective 4WD solenoid
- – Defective gearbox
- – Fusible link or blown fuse (if applicable).
- – PCM/TCM Defective
What are the symptoms of the P0839 Fault code?
You may experience the following symptoms if your vehicle has a P0839 code:
- – Illumination for check engine light
- – 4WD malfunction light on
- Difficulty in changing gears
- – Vehicle stuck in gear
- – The vehicle might not shift into gear.
- – Engine stalling after the vehicle is stopped
How do I fix the P0839 fault code?
The following repairs may be able to resolve the P0839 fault code:
- – Clear the codes first and then do a road test to see if they return.
- – Make sure to inspect the connectors and wires of your 4WD switch. Replace any damaged or broken wires as well as loose or rusty connectors.
- – Verify the voltage of the battery to the 4WD switch. Both short and open circuits should be repaired.
- – Replacing a defective 4WD switch or solenoid
- – Replacing a fuse or fuse link that has blown (if applicable).
- – Replacing an infected PCM/TCM
How serious is the P0839 Fault code?
Fault code 0839 could prevent the vehicle’s starting, cause it to not shift into a gear, or render the vehicle non-functional. It can damage the engine and cause internal transmission problems if the intermediate transmission is stuck at a low gear. This code is serious. This fault must be fixed as soon possible.
