AutoCodes – Ford – C1729 Ford

C1729 Ford Code - The Vehicle Does Not Shift Between 4H And 4L Modes Correctly

Quick Answer

The high-low shift occurs when the reduction shift fork moves the high-low collar to lock the planetary gear set to the output shaft. Common causes include Transmission neutral switch, Brake ON/OFF (BOO) switch, ABS wheel speed inputs. 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: C1729 Ford indicates The Vehicle Does Not Shift Between 4H And 4L Modes Correctly.
Common causes: Common causes include Transmission neutral switch, Brake ON/OFF (BOO) switch, ABS wheel speed inputs.
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 4,772

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1729 Ford Description

The high-low shift occurs when the reduction shift fork moves the high-low collar to lock the planetary gear set to the output shaft. The torque transmitted through the sun gear from the input shaft turns the front planetary gear set assembly. The front planetary gear set assembly, now engaged, provides transfer case speed reduction. Certain criteria, such as vehicle speed, transmission range selection and brake applied must be met before this shift can occur. Systematically check the necessary inputs and outputs of the 4x4 module (PCM), components of the transfer case, IWE components and half shafts.

OBDII Code C1729 Ford - The Vehicle Does Not Shift Between 4H And 4L Modes Correctly - AutoCodes.com — C1729 Ford Code - The Vehicle Does Not Shift Between 4H And 4L Modes Correctly

What does this mean?

What are the Possible Causes of the DTC C1729 Ford?

Transmission neutral switch
Brake ON/OFF (BOO) switch
ABS wheel speed inputs
CAN communication network
Transfer case
4x4 module (PCM)

How to Fix the DTC C1729 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 C1729 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.

Need more information about the C1729 Ford code?

Need more information on how to fix the C1729 Ford code? Get Access to Factory Service Manuals

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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 C1729 Ford Code

1. What are the common symptoms of OBDII code C1729 in a Ford vehicle?

- The common symptoms include difficulty shifting between 4H and 4L modes, flashing indicator lights on the dash, and abnormal noises during shifting.

2. What could cause the vehicle to not shift correctly between 4H and 4L modes with OBDII code C1729?

- Possible causes may include a faulty transfer case motor, damaged wiring harness, a malfunctioning transfer case control module, or low transfer case fluid level.

3. How can I diagnose the issue causing OBDII code C1729 in my Ford vehicle?

- Diagnose the issue by checking the transfer case motor for proper operation, inspecting the wiring for any damages, scanning the transfer case control module for error codes, and ensuring the transfer case fluid level is adequate.

4. Is it safe to continue driving my Ford vehicle with OBDII code C1729 and shifting issues?

- It is not recommended to continue driving the vehicle as improper shifting between 4H and 4L modes can lead to further damage to the transfer case components and affect the vehicle's drivability.

5. What are some repair tips for fixing the shifting problem related to OBDII code C1729 in a Ford vehicle?

- Repair tips include checking and replacing the transfer case motor if faulty, repairing any damaged wiring, resetting the transfer case control module, and ensuring the proper fluid level in the transfer case.

6. Can resetting the transfer case control module resolve the shifting issue indicated by OBDII code C1729 in a Ford vehicle?

- Resetting the transfer case control module can sometimes resolve minor communication errors and temporary issues, but it is recommended to diagnose the root cause of the problem for a lasting solution.

7. How much does it typically cost to repair the shifting problem related to OBDII code C1729 in a Ford vehicle?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from $200 to $600 for parts and labor, excluding any additional diagnostics or troubleshooting.

8. Can a DIY enthusiast fix the shifting issue associated with OBDII code C1729 in a Ford vehicle?

- While some basic troubleshooting and repairs can be done by DIY enthusiasts, complex issues like transfer case motor replacement or control module reprogramming may require professional expertise and specialized tools.