AutoCodes – Generic – P279D

P279D Code - Four Wheel Drive Range Signal Circuit

Quick Answer

The Transmission Control Module (TCM) monitors the Four Wheel Drive Range Signal Circuit signal. Common causes include Faulty Four Wheel Drive Range, Four Wheel Drive Range harness is open or shorted, Four Wheel Drive Range 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: P279D indicates Four Wheel Drive Range Signal Circuit.
Common causes: Common causes include Faulty Four Wheel Drive Range, Four Wheel Drive Range harness is open or shorted, Four Wheel Drive Range 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 10,001

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 Feb 13, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P279D Description

The Transmission Control Module (TCM) monitors the Four Wheel Drive Range Signal Circuit signal. the TCM sets the OBDII code when the Four Wheel Drive Range Signal Circuit signal is out of the factory specifications.

OBDII Code P279D - Four Wheel Drive Range Signal Circuit - AutoCodes.com — P279D Code - Four Wheel Drive Range Signal Circuit

What does this mean?

What are the Possible Causes of the DTC P279D?

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

How to Fix the DTC P279D?

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 P279D 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 P279D code?

Need more information on how to fix the P279D code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P279D Code

1. What are the common symptoms of OBDII code P279D (Four Wheel Drive Range Signal Circuit)?

- Common symptoms include difficulty engaging or disengaging four-wheel drive, illuminated 4WD warning light, and potential loss of four-wheel drive functionality.

2. What are the possible causes of OBDII code P279D?

- The code P279D may be caused by issues such as a faulty four-wheel drive range signal circuit, damaged wiring or connectors, a defective transfer case control module, or a malfunctioning transfer case actuator.

3. How can I diagnose the OBDII code P279D?

- Diagnosing the code P279D involves using a diagnostic scanner to retrieve the trouble codes, inspecting the wiring and connectors related to the four-wheel drive system, testing the transfer case control module and actuator, and performing a thorough visual inspection for any visible damage.

4. What are some repair tips for resolving OBDII code P279D?

- Repair tips for resolving the code P279D include repairing or replacing damaged wiring and connectors, replacing a faulty transfer case control module or actuator, resetting the system by clearing the codes and performing a relearn procedure, and ensuring proper fluid levels in the transfer case.

5. Can I drive my vehicle with OBDII code P279D active?

- It is not recommended to drive the vehicle with the code P279D active, as it may lead to potential loss of four-wheel drive functionality and compromise the vehicle's traction and stability in certain driving conditions.

6. How much does it typically cost to repair OBDII code P279D?

- The cost of repairing the code P279D can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Is OBDII code P279D a serious issue that requires immediate attention?

- OBDII code P279D should be addressed in a timely manner to prevent further damage to the four-wheel drive system and ensure the vehicle's drivability and safety, especially in adverse weather or off-road conditions.

8. Are there any preventive maintenance steps to avoid OBDII code P279D?

- To prevent OBDII code P279D, it is recommended to regularly inspect and maintain the four-wheel drive system components, address any warning lights or unusual symptoms promptly, and follow the manufacturer's recommended service intervals for the transfer case system.

9. Can a DIY enthusiast fix OBDII code P279D at home?

- While some DIY enthusiasts may have the skills and tools to diagnose and repair OBDII code P279D at home, it is recommended to consult a professional mechanic or technician for a thorough diagnosis and proper repair to ensure the issue is resolved correctly.

10. How long does it typically take to repair OBDII code P279D?

- The time required to repair OBDII code P279D can vary based on the specific cause of the issue, the availability of parts, and the technician's experience, but it may take anywhere from a few hours to a day or more to complete the repair.