AutoCodes – Dodge – P0839 Dodge

P0839 Dodge Code - Four Wheel Drive Switch Circuit High

Quick Answer

The Transmission Control Module (TCM) monitors the Four Wheel Drive Switch Circuit signal. Common causes include Faulty Four Wheel Drive Switch, Four Wheel Drive Switch harness is open or shorted, Four Wheel Drive Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0839 Dodge indicates Four Wheel Drive Switch Circuit High.
Common causes: Common causes include Faulty Four Wheel Drive Switch, Four Wheel Drive Switch harness is open or shorted, Four Wheel Drive Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 10,985

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 10, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0839 Dodge Description

The Transmission Control Module (TCM) monitors the Four Wheel Drive Switch Circuit signal. the TCM sets the OBDII code when the Four Wheel Drive Switch Circuit is not to factory specifications.

OBDII Code P0839 Dodge - Four Wheel Drive Switch Circuit High - AutoCodes.com — P0839 Dodge Code - Four Wheel Drive Switch Circuit High

What does this mean?

What are the Possible Causes of the DTC P0839 Dodge?

Faulty Four Wheel Drive Switch
Four Wheel Drive Switch harness is open or shorted
Four Wheel Drive Switch circuit poor electrical connection

How to Fix the DTC P0839 Dodge?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0839 Dodge code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0839 Dodge Code

1. What does the OBDII code P0839 mean on a Dodge vehicle?

P0839 indicates a "Four Wheel Drive Switch Circuit High," meaning the powertrain control module (PCM) has detected an issue with the electrical circuit of the four-wheel-drive (4WD) switch.

2. What are the common symptoms of a P0839 code in a Dodge?

Symptoms may include the 4WD system not engaging or disengaging properly, a 4WD warning light on the dashboard, or no noticeable 4WD functionality.

3. What causes the P0839 code to appear in a Dodge?

Common causes include a faulty 4WD switch, damaged wiring or connectors in the switch circuit, a malfunctioning PCM, or an electrical short or open in the 4WD circuit.

4. Can I still drive my Dodge with the P0839 code active?

Yes, you can usually drive the vehicle, but the 4WD system may not function properly, which could affect drivability in off-road or slippery conditions.

5. How do I diagnose the P0839 code on my Dodge?

Start by inspecting the 4WD switch and its wiring for visible damage, test the circuit with a multimeter for continuity, and check for loose or corroded connectors.

6. How is the P0839 code typically fixed?

Repairs may involve replacing the 4WD switch, repairing or replacing damaged wiring, cleaning or securing connectors, or, in rare cases, replacing the PCM.

7. What tools are needed to troubleshoot the P0839 code?

Youâ€™ll need an OBDII scanner, a digital multimeter, and possibly wiring diagrams for your Dodge's 4WD system.

8. Is the P0839 code specific to Dodge vehicles?

No, the P0839 code is a generic OBDII code that can apply to any vehicle with a 4WD system, but the diagnostic steps and parts involved may vary by make and model.

9. How much does it cost to repair a P0839 code on a Dodge?

The cost can range from $50 to $300, depending on whether the issue is a simple wiring repair or requires replacing the 4WD switch or other components.

10. Can a P0839 code be triggered by low battery voltage?

Yes, low battery voltage or electrical issues can sometimes cause false circuit-related codes, including P0839. Ensure the battery and charging system are functioning properly.