AutoCodes – Generic – P279F

P279F Code - Four Wheel Drive Range Signal Circuit Low

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: P279F indicates Four Wheel Drive Range Signal Circuit Low.
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 3,548

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
Comments
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Code P279F 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 P279F - Four Wheel Drive Range Signal Circuit Low - AutoCodes.com — P279F Code - Four Wheel Drive Range Signal Circuit Low

What does this mean?

What are the Possible Causes of the DTC P279F?

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 P279F?

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 P279F 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.