AutoCodes – Ford – C1979 Ford

C1979 Ford 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 Ford 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 24,438

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 Ford 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 Ford - IWE Solenoid Circuit Failure - AutoCodes.com — C1979 Ford Code - IWE Solenoid Circuit Failure

What does this mean?

What are the Possible Causes of the DTC C1979 Ford?

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 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 C1979 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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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 C1979 Ford Code

1. What does the OBDII code C1979 mean on a Ford vehicle?

The C1979 code indicates an "IWE Solenoid Circuit Failure," meaning there is an issue with the circuit controlling the Integrated Wheel End (IWE) solenoid, which affects the 4WD system.

2. What are the common symptoms of the C1979 code?

Symptoms may include the 4WD system not engaging or disengaging properly, unusual noises from the front wheels, or the 4WD warning light illuminating on the dashboard.

3. What causes the C1979 code in Ford vehicles?

Common causes include a faulty IWE solenoid, damaged wiring or connectors in the solenoid circuit, vacuum leaks in the IWE system, or a failing 4WD module.

4. How can I diagnose the C1979 code?

Start by inspecting the IWE solenoid and its wiring for damage or corrosion. Use a multimeter to test the solenoid and circuit for proper voltage and continuity. Check for vacuum leaks in the IWE system.

5. Can a vacuum leak trigger the C1979 code?

Yes, vacuum leaks in the IWE system can cause the solenoid to malfunction, leading to improper 4WD operation and triggering the C1979 code.

6. How do I fix the C1979 code on my Ford?

Repairs may involve replacing a faulty IWE solenoid, repairing or replacing damaged wiring or connectors, fixing any vacuum leaks, or replacing the 4WD control module if necessary.

7. Is it safe to drive with the C1979 code active?

While the vehicle may still be drivable, the 4WD system may not function correctly, which can impact traction and handling in off-road or slippery conditions.

8. How much does it cost to fix the C1979 code?

The cost depends on the cause. Replacing an IWE solenoid typically costs $100â€“$200, while fixing wiring or vacuum leaks may vary. Labor costs will add to the total.

9. Can a bad IWE solenoid damage other parts of the vehicle?

Yes, if the IWE solenoid fails, it can cause improper engagement of the front hubs, potentially leading to premature wear on the hubs, axles, or drivetrain components.

10. How can I prevent the C1979 code from occurring?

Regularly inspect and maintain the IWE system, check for vacuum leaks, keep electrical connections clean, and address any 4WD issues promptly to prevent circuit failures.