AutoCodes – Ford – P1839 Ford

P1839 Ford Code - Transfer Case Shift Motor Open Circuit

Quick Answer

The Mode Select Switch (MSS) communicates the operator's choice to the Transfer Case Control Module (TCCM). Common causes include Faulty Transfer Case Control Module (TCCM), Transfer Case Control Module harness is open or shorted, Transfer Case Control Module 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: P1839 Ford indicates Transfer Case Shift Motor Open Circuit.
Common causes: Common causes include Faulty Transfer Case Control Module (TCCM), Transfer Case Control Module harness is open or shorted, Transfer Case Control Module 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 15,788

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 Aug 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1839 Ford Description

The Mode Select Switch (MSS) communicates the operator's choice to the Transfer Case Control Module (TCCM). As the TCCM commands the gearmotor encoder assembly to 4H mode, the transfer case shift fork moves to engage 4H mode which also engages the dual-cone synchronizers to bring the front driveline to the same speed as the rear driveline. The TCCM also activates the hublock vacuum solenoid, providing a vacuum and engaging the Constant Vacuum Hublock (CVH) at each front wheel. If the vehicle is not responding to the operator's intentions, systematically check the necessary inputs and outputs of the TCCM, components of the transfer case, CVH components, and axle shafts. Check all circuits for opens and shorts to power or ground.

OBDII Code P1839 Ford - Transfer Case Shift Motor Open Circuit - AutoCodes.com — P1839 Ford Code - Transfer Case Shift Motor Open Circuit

What does this mean?

What are the Possible Causes of the DTC P1839 Ford?

Faulty Transfer Case Control Module (TCCM)
Transfer Case Control Module harness is open or shorted
Transfer Case Control Module circuit poor electrical connection
Faulty Transfer case
Faulty Front axle assembly

How to Fix the DTC P1839 Ford?

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 P1839 Ford 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 P1839 Ford Code

1. What are the common symptoms of OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit?

- The common symptoms include difficulty shifting the transfer case, the vehicle getting stuck in a specific drive mode, and a warning light on the dashboard.

2. What are the possible causes of OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit?

- The code can be triggered by a faulty transfer case shift motor, damaged wiring or connectors related to the shift motor, or a malfunction in the transfer case control module.

3. How can I diagnose the issue related to OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit?

- Diagnosing the problem involves inspecting the wiring and connectors associated with the transfer case shift motor, testing the shift motor itself for proper functionality, and checking the transfer case control module.

4. Can I continue to drive my vehicle with OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit?

- It is not recommended to drive the vehicle with this code as it can lead to further damage to the transfer case components and potentially cause safety issues.

5. What are the repair options for OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit?

- Repair options include replacing the transfer case shift motor, repairing or replacing damaged wiring and connectors, and reprogramming or replacing the transfer case control module if necessary.

6. Is it possible to reset or clear OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it is essential to address the root cause of the problem to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit?

- The repair cost can vary depending on the extent of the damage and the specific components needing replacement, but it can range from a few hundred dollars to over a thousand dollars.

8. Can a DIY enthusiast fix OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit at home?

- While some aspects of the repair, such as checking and replacing fuses or connectors, can be done at home, diagnosing and replacing major components like the shift motor may require professional expertise.

9. How long does it take to repair OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit?

- The repair time can vary depending on the extent of the issue and the availability of parts, but it typically takes a few hours to a full day to complete the repair.

10. Can OBDII code P1839 (Ford) Transfer Case Shift Motor Open Circuit affect the overall drivability of the vehicle?

- Yes, the code can affect the drivability by causing issues with shifting between drive modes and potentially limiting the vehicle's overall performance.