P0839
Four Wheel Drive Switch Circuit High
Generic code
Transmission System
High severity
Hard repair
Free on OBD DashX
Want real-world data on P0839?
See which problems come with P0839, how often it shows up in other vehicles, and how to fix it — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
What P0839 means
- The fault code P0839 indicates that there is an issue with the 4WD switch circuit, indicating a high signal input.
Possible symptoms
- Illuminated 4WD warning light on the dashboard
- Inability to shift into 4WD mode
- Unintended shifting into 4WD mode
- Reduced drivability or performance issues
Possible causes
- Faulty or damaged 4WD switch
- Faulty wiring or connections in the circuit
- Loose or corroded electrical connections
- Failed transfer case control module
Related parts
- Four Wheel Drive Switch: Four Wheel Drive Switch engages the four wheel drive when required by the user. This car's switch has a problem which will lead to poor engine performance & wheel slipping
Possible solutions
- Replace the 4WD switch
- Check and repair any damaged wiring or connections
- Tighten or clean any loose or corroded electrical connections
- Replace the transfer case control module if necessary
Free on OBD DashX
P0839 on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
Open P0839 No sign-up needed · available in 10 languagesScan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.