AutoCodes – Mercury – C1979 Mercury

C1979 Mercury Code - IWE Solenoid Circuit Failure

Quick Answer

The Four Wheel Drive (4WD) Control Module monitors the Integrated Wheel End (IWE) Solenoid. Common causes include Faulty Integrated Wheel End (IWE) Solenoid, Integrated Wheel End (IWE) Solenoid harness is open or shorted, Integrated Wheel End (IWE) Solenoid 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: C1979 Mercury indicates IWE Solenoid Circuit Failure.
Common causes: Common causes include Faulty Integrated Wheel End (IWE) Solenoid, Integrated Wheel End (IWE) Solenoid harness is open or shorted, Integrated Wheel End (IWE) Solenoid 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 691

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 Dec 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1979 Mercury Description

The Four Wheel Drive (4WD) Control Module monitors the Integrated Wheel End (IWE) Solenoid. The 4WD Control Module sets the OBDII code when the IWE Solenoid is not to factory specifications.

OBDII Code C1979 Mercury - IWE Solenoid Circuit Failure - AutoCodes.com — C1979 Mercury Code - IWE Solenoid Circuit Failure

What does this mean?

What are the Possible Causes of the DTC C1979 Mercury?

Faulty Integrated Wheel End (IWE) Solenoid
Integrated Wheel End (IWE) Solenoid harness is open or shorted
Integrated Wheel End (IWE) Solenoid circuit poor electrical connection

How to Fix the DTC C1979 Mercury?

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 C1979 Mercury 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 C1979 Mercury code?

Need more information on how to fix the C1979 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1979 Mercury code diagnosed by a professional: Find a repair shop in your area

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 C1979 Mercury Code

What does the OBDII code C1979 indicate for a Mercury vehicle?

The OBDII code C1979 indicates an IWE (Integrated Wheel End) solenoid circuit failure, which affects the operation of the four-wheel drive system.

What are the common symptoms associated with the C1979 code?

Common symptoms include a malfunctioning four-wheel drive system, warning lights on the dashboard, unusual noises from the front wheels, or a decrease in vehicle performance when attempting to engage four-wheel drive.

What could cause the C1979 code to trigger?

Possible causes include a faulty IWE solenoid, damaged wiring or connectors in the solenoid circuit, or issues with the vehicle's control module.

How can I diagnose the issue related to the C1979 code?

To diagnose the C1979 code, use an OBDII scanner to confirm the code, visually inspect the IWE solenoid wiring and connectors for damage, and test the solenoid's functionality with a multimeter.

What repair options are available for fixing the C1979 code?

Repair options may include replacing the faulty IWE solenoid, repairing or replacing damaged wiring and connectors, or reprogramming or replacing the control module if it is determined to be faulty.

Can I drive my vehicle with the C1979 code present?

While it may be possible to drive the vehicle, it is not recommended, as the four-wheel drive system may not function properly, which could lead to safety issues in certain driving conditions.

How much does it typically cost to repair the issue associated with the C1979 code?

Repair costs can vary widely depending on the specific problem, but replacing the IWE solenoid generally ranges from $100 to $300, including parts and labor.

Is there a way to temporarily fix the issue related to the C1979 code?

A temporary fix might involve manually engaging the four-wheel drive system if accessible, but this is not a long-term solution, and the actual problem should be addressed.

What should I do if the C1979 code keeps recurring after repairs?

If the C1979 code keeps recurring, consider getting a professional diagnosis to check for other underlying issues such as electrical problems, incorrect installation of parts, or faults in the control module.